Infineon(R) Power LED Driver TLD5045EJ 700mA High Integration - DC/DC StepDown Converter Datasheet Rev. 1.0, 2011-05-27 Automotive Power TLD5045EJ Table of Contents Table of Contents Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 3.1 3.2 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin Definitions and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 4.1 4.2 4.3 General Product Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5.1 5.2 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 General Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Power Supply Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 6.1 6.2 6.2.1 6.2.2 6.3 Enable, Dimming Function and Thermal Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Characteristics Enable, Bias, Dimming Function and Thermal Protection . . . . . . . . . . . . . PWM Dimming with C connected to TLD5045 PWMI pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internal PWM dimming Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Overtemperature Protection of the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 11 12 13 14 15 7 7.1 7.2 7.3 7.3.1 7.4 Open Load Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Characteristics: Open Load Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Open Load Diagnosis in different Application Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Light module application without C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Application with C connected to TLD5045 IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 16 16 17 17 18 8 8.1 8.2 8.3 8.3.1 8.3.2 8.3.3 8.3.4 Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output Peak Current Adjustment via RSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Switching Frequency Determination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TLD5045 in different LED Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TLD5045 in a Body Control Module (BCM) with C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Decentralized Light Module Application - DLM (Input configuration 1) . . . . . . . . . . . . . . . . . . . . . . Decentralized Light Module Application - DLM (Input configuration 2) . . . . . . . . . . . . . . . . . . . . . . Decentralized Light Module Application - DLM (Input configuration 3) . . . . . . . . . . . . . . . . . . . . . . 19 19 20 22 22 23 24 25 9 Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 10 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Datasheet 2 7 7 8 8 Rev. 1.0, 2011-05-27 700mA High Integration - DC/DC Step-Down Converter 1 * * * * * * * * * * * * * * * * * * TLD5045EJ Overview Constant Current Generation Wide Input Voltage Range from 5V to 40V Peak Current Regulation Very low current consumption (<2uA) in Sleep Mode Integrated power transistor with low saturation voltage Integrated fast freewheeling diode Integrated load current sense resistor Integrated status pull down transistor Overtemperature Protection Switching frequency (typ. 200kHz) adjustable via external RC network PG-DSO-8 EP External PWM Dimming Input Integrated PWM Dimming Engine Analog Dimming (output current adjustable via external low power resistor and possibility to connect PTC resistor for LED protection during overtemperature conditions) Stable switching frequency due to fix OFF-time concept with VREC (supply voltage) feedforward Under- and Overvoltage shutdown with hysteresis Small thermally enhanced exposed heatslug SMD package Automotive AEC Qualified Green Product (RoHS) Compliant Description The TLD5045 is a highly integrated smart LED buck controller with built in protection functions. The main function of this device is to drive single or multiple series connected LEDs efficiently from a voltage source higher than the LED forward voltage by regulating a constant LED current. The constant current regulation is especially beneficial for LED color accuracy and long LED lifetime. The built in freewheeling diode and switching transistor with current sense requires less external components and saves system costs. High flexibility is achieved by placing low power resistors to adjust output currents up to 700mA and the regulator switching frequency (typ. 200kHz). An integrated PWM dimming engine provides a LED dimming function by placing a simple RC network to GND. This feature is dedicated for decentralized light modules without micro controller involvement. In addition to that an integrated status pull down transistor can be used to simulate a minimum current flow for decentralized modules to avoid a wrong open load detection by a highside switch located in the body control module (BCM). Applications * * Automotive LED driven Exterior Lighting: Brake, Tail, CHMSL, Daytime Running Light, Position Light Automotive LED driven Interior Lighting: Reading Light, Dome Light, Display Backlighting Type Package Marking TLD5045EJ PG-DSO-8 EP TLD5045 Datasheet 3 Rev. 1.0, 2011-05-27 TLD5045EJ Block Diagram 2 Block Diagram The TLD5045 regulates the LED current by monitoring the load current (Peak Current Measurement) through the internal switch cycle by cycle. When the current through the switch reaches the threshold Ipeak the switch is shutOFF and it is kept OFF for a time equal to tOFF. Both Ipeak and tOFF can be fixed through few external components. The peak current Ipeak is fixed by a resistor connected to the SET pin while the tOFF is fixed by RC network. As tOFF is fixed and the duty cycle depends on VREC, the frequency depends on VREC as well. Refer to Chapter 8.2 for the evaluation of the switching frequency. PWMI FREQ EN VREC 6 3 1 ON/OFF Logic 5 Internal Supply UV+OV Lockout OFF-Time Control 8 internal PWM Generation PowerSwitch Driver Logic SW Power Switch Thermal Protection ST Peak Current Measurement 2 Open Load Detection Figure 1 Datasheet Peak Current Adjustment 4 7 SET GND Block Diagram TLD5045 4 Rev. 1.0, 2011-05-27 TLD5045EJ Pin Configuration 3 Pin Configuration 3.1 Pin Assignment TLD5045 8 SW 2 7 GND EN 3 6 FREQ SET 4 5 PWMI VREC 1 ST EP Figure 2 Pin Configuration TLD5045 3.2 Pin Definitions and Functions Pin Symbol Function 1 VREC Voltage Recirculation Output and Internal Supply Input; This pin is the supply pin of the IC (see block diagram). Furthermore the cathode of the integrated fast freewheeling diode is connected to this pin as well. 2 ST Status Output; Open collector diagnostic output to indicate an open load failure. Refer to Chapter 7 for more details. 3 EN Enable; Apply logic HIGH signal to enable the device 4 SET SET Input; Connect a low power resistor to adjust the output current. 5 PWMI PWM Input; PWM signal for dimming LEDs. Connect external R and C combination to achieve an auto PWM-dimming function with defined frequency and duty cycle. 1) internal PWM dimming function (external RC connected to GND) 2) external PWM dimming function (C is controlling this pin) Refer to Chapter 6 for more details. 6 FREQ FREQuency Select Input; Connect external Resistor and Capacitor to GND to set the OFF-time of the switching frequency. 7 GND Ground; Connect to system ground. Datasheet 5 Rev. 1.0, 2011-05-27 TLD5045EJ Pin Configuration Pin Symbol Function 8 SW Integrated Power-Switch Output; Collector of the integrated NPN-power transistor. EP Datasheet Exposed Pad; Connect to external heatspreading copper area with electrically GND (e.g. inner GND layer of the PCB via thermal vias) 6 Rev. 1.0, 2011-05-27 TLD5045EJ General Product Characteristics 4 General Product Characteristics 4.1 Absolute Maximum Ratings Absolute Maximum Ratings1) Tj = -40 C to +150 C; all voltages with respect to ground (unless otherwise specified) Pos. Parameter Symbol Limit Values Min. Max. Unit Conditions Voltages 4.1.1 VREC (Pin 1) Recirculation and Supply Input VREC -0.3 45 V - 4.1.2 ST (Pin 2) Diagnostic Status Output Voltage VST -0.3 45 V - 4.1.3 ST (Pin 2) Diagnostic Status Current IST - 150 mA - 4.1.4 EN (Pin 3) Enable Input Voltage VEN -0.3 45 V - 4.1.5 SET (Pin 4) Peak Current Adjust Input Voltage VSET -0.3 6 V - 4.1.6 PWMI (Pin 5) PWM Input Voltage VPWMI -0.3 6 V - 4.1.7 FREQ (Pin 6) OFF-time Adjustment Input VFREQ -0.3 6 V - 4.1.8 SW (Pin 8) Switch Output VSW -0.3 45 V - Tj Tstg -40 150 C - -55 150 C - 2 kV HBM 2) Temperatures 4.1.9 Junction Temperature 4.1.10 Storage Temperature ESD Susceptibility 4.1.11 ESD Resistivity all Pins to GND VESD,HBM -2 1) Not subject to production test, specified by design. 2) ESD susceptibility HBM according to EIA/JESD 22-A 114B Note: Stresses above the ones listed here may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note: Integrated protection functions are designed to prevent IC destruction under fault conditions described in the data sheet. Fault conditions are considered as "outside" normal operating range. Protection functions are not designed for continuous repetitive operation. Datasheet 7 Rev. 1.0, 2011-05-27 TLD5045EJ General Product Characteristics 4.2 Functional Range Pos. Parameter Symbol Min. Max. 4.2.1 Extended Supply Voltage VREC 5 401) VREC IOUT fSW Tj 8 36 V - 100 700 mA - 50 3001) kHz Tj = 25C to 150C -40 150 C - 4.2.1 Nominal Supply Voltage Range 4.2.2 Output current range 4.2.3 Switching Frequency 4.2.4 Junction Temperature Limit Values Unit Conditions parameter deviations possible 1) Not subject to production test, specified by design. Note: Within the functional range the IC operates as described in the circuit description. The electrical characteristics are specified within the conditions given in the related electrical characteristics table. 4.3 Thermal Resistance Note: This thermal data was generated in accordance with JEDEC JESD51 standards. For more information, go to www.jedec.org. Pos. Parameter Symbol 4.3.1 Junction to Case 4.3.2 Junction to Ambient (2s2p) RthJ-case RthJA Limit Values Unit Conditions Min. Typ. Max. - 10 - K/W 1) 2) - 40 - K/W 1) 3) 1) Not subject to production test, specified by design. 2) Specified RthJ-case value is simulated at natural convection on a cold plate setup (all pins and the exposed Pad are fixed to ambient temperature). Ta=25C, Power Switch and freewheeling diode are dissipating 1W. 3) Specified RthJA value is according to Jedec JESD51-2,-7 at natural convection on FR4 2s2p board; The Product (Chip+Package) was simulated on a 76.2 x 114.3 x 1.5 mm board with 2 inner copper layers (2 x 70m Cu, 2 x 35m Cu). According to JESD51-5 a thermal via array under the exposed pad contacted the first inner copper layer. Ta=25C, Power Switch and freewheeling diode are dissipating 1W. Datasheet 8 Rev. 1.0, 2011-05-27 TLD5045EJ Electrical Characteristics 5 Electrical Characteristics 5.1 General Parameters Electrical Characteristics: Buck Regulator VREC = 8 V to 36 V, Tj = -40 C to +150 C, all voltages with respect to ground (unless otherwise specified) Pos. Parameter Symbol Limit Values Min. Typ. Max. Unit Conditions 5.1.1 Voltage Drop over Power Transistor VDrop,100 - 0.8 - V Ipeak=100mA 5.1.2 Voltage Drop over Power Transistor VDrop,700 - 1.4 - V Ipeak=700mA 5.1.3 Freewheeling diode forward voltage Vfw,100 - 0.8 - V Ipeak=100mA 5.1.4 Freewheeling diode forward voltage Vfw,700 - 1.4 - V Ipeak=700mA 5.1.5 Peak over current limit - 1.4 - A - 5.1.6 Peak current accuracy Ipeak_lim Ipeak_acc 450 500 550 mA VREC = 12V VEN = 5V VLED = 7.2V RSET = 14k LSW = 220H fSW = 200kHz 5.1.7 Input under voltage shutdown threshold - 5 V VEN = 5V VREC decreasing; see VREC,UVOFF - Figure 3 5.1.8 Input voltage startup threshold VREC,UVON - - 6 V VEN = 5V VREC increasing; see Figure 3 5.1.9 Input over voltage shutdown threshold VREC,OVOFF 40.5 - - V VEN = 5V VREC increasing; see Figure 3 5.1.10 Input over voltage startup threshold VREC,OV 40 - - V VEN = 5V VREC decreasing; see Figure 3 5.1.11 Switch ON delay 5.1.12 Switch OFF delay 5.1.13 Reference Voltage at SET pin 5.1.14 Pull up current for FREQ pin 5.1.15 Oscillator switch off threshold 5.1.16 Oscillator switch on threshold tdON tdOFF VSET IFREQ VFREQ,HIGH VFREQ,LOW - 400 600 850 ns 1) - ns 1) - - 500 1.16 1.225 1.29 V - 5 - - mA VFREQ=0V - 3.2 - V - - 1.2 - V - 1) The minimum switching ON time tON must be greater than tdON + tdOFF Datasheet 9 Rev. 1.0, 2011-05-27 TLD5045EJ 5.2 Power Supply Monitoring Over- and Undervoltage shutdown If the supply voltage VREC drops below the Input under voltage threshold voltage VREC,UVOFF, the power stage is switched OFF and the device is in normal consumption mode (Iq,ON). If VREC rises again and reaches the Input under voltage startup threshold VREC,UVON the power stage is restarted and the device is back to normal operation mode. Same behavior applies to overvoltage. The internal status transistor is switching off during an overvoltage or undervoltage event on VREC. A detailed description of the under- and overvoltage behavior is displayed in Figure 3 below. VREC VREC,OVhyst VR EC,OVoff VREC,OVon VREC,UVhyst VREC,U Von VREC,UVoff t VSW t I LED Iset t ST t ST pulldown ON Figure 3 Datasheet ST pull-down transistor OFF ST pulldown ON ST pull-down transistor OFF ST pulldown ON Over- and Undervoltage Protection 10 Rev. 1.0, 2011-05-27 TLD5045EJ Enable, Dimming Function and Thermal Protection 6 Enable, Dimming Function and Thermal Protection 6.1 Description Enable function: A logic high signal on the EN pin turns the device on. A logic low signal on enable pin EN brings the device in sleep mode. The current consumption is typ. 0.1A in this case. The EN pin has an internal pull down resistor which ensures that the IC is in sleep mode and the power stage is switched off in case the pin EN is externally not connected. Dimming function: The PWMI pin combines two functions: 1) PWM dimmming via a C (3.3Vand 5V C) 2) Integrated PWM dimming engine for standalone solutions in decentralized light module (frequency and duty cycle adjustable via external R,C network) A detailed description of the PWMI pin is displayed in Figure 4 below. VPWMI PWMI OFF AE DC=0% VPWMI,OFF Internal PWM VPWMI,ON PWMI ON AE DC=100% SWON Figure 4 Datasheet SW - OFF SWON SW - OFF SWON SW - OFF SWON SW - OFF t PWMI Pin description 11 Rev. 1.0, 2011-05-27 TLD5045EJ Enable, Dimming Function and Thermal Protection 6.2 Electrical Characteristics Enable, Bias, Dimming Function and Thermal Protection Electrical Characteristics: Enable, Bias, Dimming Function and Thermal Protection VREC = 8 V to 36 V, Tj = -40 C to +150 C, all voltages with respect to ground (unless otherwise specified) Pos. Parameter Symbol Limit Values Min. Typ. Max. Unit Conditions VEN = 0V; VREC = 16V VEN = 5.0V; Ipeak = 0mA (open load); VREC = 16V VEN = 5.0V; Ipeak = 700mA VREC = 16V 6.2.1 Current Consumption, sleep mode Iq,OFF - 0.1 2 A 6.2.2 Current Consumption, active mode (Open Load) Iq,ON - - 5 mA 6.2.3 Current Consumption, active mode Iq,ON - - 10 mA 6.2.4 EN Turn On Threshold VEN,ON 2.8 - - V - 6.2.5 EN Turn Off Threshold VEN,OFF - - 0.8 V - 6.2.6 EN high input current IEN,hi - 100 - A VEN = 5V 6.2.7 EN low input current IEN,lo 0 - 20 A VEN = 0.5V 6.2.8 PWMI Turn On Threshold VPWMI,ON - 1 - V see Figure 4 6.2.9 PWMI Turn Off Threshold VPWMI,OFF - 2 - V see Figure 4 6.2.10 PWMI source current IPWMI - 250 - A Rset = 10k VPWMI = 0.5V; 6.2.11 Over temperature shutdown Tj,sd 150 175 - C 1) 6.2.12 Over temperature shutdown Tj,sd_hyst hysteresis - 15 - K 1) 1) Specified by design. Not subject to production test. Datasheet 12 Rev. 1.0, 2011-05-27 TLD5045EJ Enable, Dimming Function and Thermal Protection 6.2.1 PWM Dimming with C connected to TLD5045 PWMI pin The PWMI pin can be used for PWM dimming. It is a commonly practiced dimming method to prevent color shift in LED light applications. TPWMI VPWMI VPWMI,OFF VPWMI,ON t tOFF Ipeak t SW - OFF Figure 5 Datasheet SW - ON SW - OFF SW - ON SW - OFF Timing Diagram for LED Dimming with C 13 Rev. 1.0, 2011-05-27 TLD5045EJ Enable, Dimming Function and Thermal Protection 6.2.2 Internal PWM dimming Function The TLD5045 has an integrated PWM dimming engine. Via an external RPWM and CPWM network it is possible to achieve a PWM LED current waveform. The duty cycle and dimming frequency is depending on the size of the external components (see formula in Figure 7). This feature is specially designed to achieve a stand alone PWM dimming function without the usage of micro controllers or external logic. This allows a flexible and cost effective usage of the device in a decentralized light module application (refer to application drawing Figure 15). The advantage of a PWM dimming (to reduce the LED load current) is the change of light intensity only, at constant light color. With an external RC network a PWM programming between 100Hz and 1200Hz and Duty Cycles between 4% and max. 20%. is possible. Figure 6 displays the external components corresponding to the desired PWM frequency and duty cycle. The following setup applies for the table displayed in Figure 6: VREC=12V, VLED=7.2V, LSW=220H, RSET=14k. Figure 6 Datasheet RPWMI CPWMI fPWMI 216k 216k 216k 216k 87k 87k 87k 87k 44k 44k 44k 44k 64nF 32nF 21nF 16nF 150nF 75nF 50nF 37nF 265nF 132nF 88nF 66nF 100Hz 200Hz 300Hz 400Hz 100Hz 200Hz 300Hz 400Hz 100Hz 200Hz 300Hz 400Hz DC 4% 4% 4% 4% 10% 10% 10% 10% 20% 20% 20% 20% RPWMI and CPWMI versus fPWMI and DC 14 Rev. 1.0, 2011-05-27 TLD5045EJ Enable, Dimming Function and Thermal Protection 6.3 Overtemperature Protection of the Device A temperature sensor at the power stage causes the overheated device to switch OFF to prevent destruction. During over temperature condition the internal ST transistor is switched OFF. Due to the autorestart function of the device the status signal will toggle accordingly. The timing of this pattern is dependant on the thermal capability of the application and can be used to distinguish between open load error and overtemperature condition. More details on the overtemperature behavior is displayed in Figure 7 below. VEN H L t Tj TjSD TjSO t Ta VSW t ILED I peak t ST t ST pulldown OFF Figure 7 Datasheet ST pull-down transistor ON ST OFF ST ON ST OFF ST ON ST OFF ST ON ST OFF Overtemperature Behavior 15 Rev. 1.0, 2011-05-27 TLD5045EJ Open Load Diagnosis 7 Open Load Diagnosis 7.1 Description The TLD5045 has an integrated open load during ON diagnosis. During normal operation the ST pin (open collector output) is pulled to GND (internal transistor is ON). The open load detection is realized by monitoring the switching behavior at the SW pin. During an open load event the integrated power stage at the SW pin will be statically turned ON. If the output stage is turned ON for more than the open load diagnosis delay time (tOL) an open load condition is detected. An open load event will switch OFF the internal transistor. If a C is connected to the ST pin an external pull up resistor should be placed to achieve a logic HIGH level for the proper open load error signalling reporting. For a timing diagram on the functionality of the open load diagnosis please refer to figure Figure 8 and Figure 9. 7.2 Electrical Characteristics: Open Load Diagnosis Electrical Characteristics: Open Load Diagnosis VREC = 8 V to 36 V, Tj = -40 C to +150 C, all voltages with respect to ground (unless otherwise specified) Pos. Parameter Symbol Min. Typ. Max. 7.2.1 Open Load diagnosis DelayTime tOL 20 - 7.2.2 Voltage Drop over internal ST transistor VDrop,ST - 0.3 Datasheet Limit Values 16 Unit Conditions - s - - V IST=150mA Rev. 1.0, 2011-05-27 TLD5045EJ Open Load Diagnosis 7.3 Open Load Diagnosis in different Application Conditions 7.3.1 Light module application without C Most of the time, the open load diagnosis of the whole light module is done via the current sense of the driver IC (e.g. PROFET) located in the light control module (or BCM module). See Figure 15 for a simplified application schematic. The light module needs to sink a specified minimum current (e.g. 100mA) to indicate normal operation. To guarantee this minimum current also under light load conditions (e.g. high efficiency LED bin at high supply voltages = min. load current required) system designers often have to place resistors in parallel to the application circuit (see Resistors connected to supply lines in Figure 15). When using such resistors connected between VS and GND, an open LED diagnosis is not possible anymore. To overcome this issue an internal transistor (open collector) is connected to the ST pin of the TLD5045. During normal operation the ST pin is LOW and a minimum module current can be guaranteed. As soon as an open load occurs the internal ST transistor switches off. Due to this, the current on the VREC pin decreases below the open load detection threshold of the driver IC located in the light control module. Note: Open Load is only detected during the ON cycle of the switching transistor. During the OFF state the ST signal displays what was detected in the previous ON state. VPWMI VPWMI,OFF VPWMI,ON t Open Load Event Open Load t VSW High - z t tOL ST t ST pull -down transistor ON Figure 8 Datasheet ST pull-down transistor OFF Open Load Diagnosis using Internal PWM Mode 17 Rev. 1.0, 2011-05-27 TLD5045EJ Open Load Diagnosis 7.4 Application with C connected to TLD5045 IC The ST pin can be connected directly to a C input. During an open load condition the ST transistor is OFF. An external pull up resistor connected to VDD is required to signal a logic high signal on the ST pin during an open load error. Please consider that this diagnosis functionality is only active if the device is in active mode (HIGH potential at the EN pin). Refer to application drawing Figure 14. VEN High Low VPWMI t TPWMI VPWMI,OFF VPWMI,ON SW - OFF SW - ON SW - OFF SW - ON SW - OFF t VSW High - z t Open Load Event Open Load t t OL ST ST pull-down transistor ON Figure 9 Datasheet ST pull-down transistor OFF t Open Load diagnosis via C connected to ST pin 18 Rev. 1.0, 2011-05-27 TLD5045EJ Application Information 8 Application Information Note: The following information is given as a hint for the implementation of the device only and shall not be regarded as a description or warranty of a certain functionality, condition or quality of the device. 8.1 Output Peak Current Adjustment via RSET The external resistor RSET is used to adjust the peak current of the regulator. Maximum achievable peak current is 700mA and minimum achievable peak current is 100mA. The SET pin provides an internally fixed voltage level at typ.: 1.225V. Out of this considerations the equation is: Ipeak = (1.225V / RSET) * 5710 The factor 5710 is derived from following considerations: * * Ipeak, max = 700mA (RSET = 10k) Ipeak,min = 100mA (RSET = 70k) Internal comperator voltage at SET pin = 1.225V. The circuitry behind the SET pin is adjusting higher peak currents with lower RSET values. The RSET value should be in the range from 10k to 70k to achieve the requested peak current range. The following setup applies for the table displayed in Figure 10: VREC=12V, VLED=7.2V, LSW=220H. Figure 10 Datasheet IPEAK [mA] RSET [k] 100 70 200 35 300 23 400 18 500 14 600 12 700 10 RSET Resistor Selection 19 Rev. 1.0, 2011-05-27 TLD5045EJ Application Information 8.2 Switching Frequency Determination With the external RFREQ, CFREQ and RCOMP network, it is possible to adjust the switching frequency of the regulator. To ensure a stable frequency over a broad range of input voltage VREC an external resistor RCOMP can be used. The following setup applies for the table displayed in Figure 12: VREC=12V, VLED=7.2V, LSW=220H, RSET=14k. 1 RCOMP VREC FREQ 6 TLD5045 RFREQ GND CFREQ 7 Figure 11 Figure 12 Datasheet Setting tOFF Time of Regulator with External RFREQ, CFREQ Network Rcomp Rfreq Cfreq fsw toff 255.8k 115.8k 69.7k 46.8k 72.8k 52.7k 17.1k 7.7k 4.6k 3.1k 4.9k 3.5k 220pF 220pF 220pF 220pF 100pF 100pF 50kHz 100kHz 150kHz 200kHz 250kHz 300kHz 6.47s 3.19s 2.12s 1.59s 1.27s 1.06s RFREQ, CFREQ versus fSW Table 20 Rev. 1.0, 2011-05-27 TLD5045EJ Application Information VEN High Low t VFREQ VFREQ,high VFREQ,low t ILED I set=I peak Imin VSW I ripple ton tup toff tdown t VREC+Vfw Vdrop Transistor Figure 13 Datasheet Diode T Diode T Diode T Diode T Diode t Theoretical Operating Waveforms 21 Rev. 1.0, 2011-05-27 TLD5045EJ Application Information 8.3 TLD5045 in different LED Applications 8.3.1 TLD5045 in a Body Control Module (BCM) with C Interface Figure 14 provides a simplified application with two high brightness LEDs in series. A C is controlling the EN pin to put the device into sleep/active mode. Also the PWMI pin can be directly controlled via a C port if PWM dimming of the LED current is required. The open load ST pin monitors the load condition of the application and gives feedback to the C. An external pull up resistor is recommended to achieve a logic HIGH signal during an open load error (internal status transistor is switched OFF and the ST pin is high ohmic an external pull up resistor ensures a logic HIGH signal). The external low power resistor RSET is used to set the required peak current for the LED load (refer to Figure 10 for more details). To set the desired switching frequency of the buck regulator the external RFREQ and CFREQ network must be connected to GND (reference values are given in Figure 12). ILED Vs = 5V to 40V LSW 1 CREC VREC SW 8 VDD open load status connected to C 7 RST 2 GND ST RFREQ FREQ CFREQ 6 RCOMP connect to C pin 3 EN VREC 4 RSET Figure 14 SET PWMI TLD5045 5 REMC PWM dimming via C Simplified Application Diagram TLD5045 Note: This is a very simplified example of an application circuit. The function must be verified in the real application Datasheet 22 Rev. 1.0, 2011-05-27 TLD5045EJ Application Information 8.3.2 Decentralized Light Module Application - DLM (Input configuration 1) The connection between the Body Control Module (BCM) and the Decentralized Light Module is realized via one supply line and one GND connection. The supply line could change between two different operation modes: 1) Light Function 1 - Daytime Running Light (DRL) mode: If the supply line is permanently ON, the DRL application which requires higher LED current (e.g. 400mA) is active. The proper RSET resistor should be placed to achieve the desired load current (e.g 18k). 2) Light Function 2 - Position Light (PL) mode: During a PWM signal (e.g. 200Hz) on the supply line the mean LED current is reduced to a lower level (e.g. 50mA) and the application is entering into PL mode. The enable pin of the TLD5045 is a high voltage pin (max. 45V) and can be directly connected via a resistor REN before the reverse polarity protection diode of the module to achieve a fast capture of the PWM signal. The PWMI pin is connected to GND (inverse logic = ON). To simulate a module current during light load conditions, the ST pin can be connected via a resistor to the supply voltage line. (refer to Chapter 7 for a detailed description of the ST behavior) For a decentralized solution without micro controller involvement the possibility to connect a PTC resistor at the SET pin is a cost effective solution to protect the LED load from thermal destruction. Vbat Wire Harness Inductance Decentralized Light Module I LED Light Function 1 (e.g. DRL) BCM - module GND REN LSW I Open_load 1 VREC SW 8 CREC 3 EN 7 GND 5 PWMI RFREQ FREQ CFREQ 6 RCOMP I ST,PD ST 2 SET RSET TLD5045 Figure 15 VREC 4 RPTC Application Diagram of Decentralized Light Module without C (input config 1) This is a very simplified example of an application circuit. The function must be verified in the real application Datasheet 23 Rev. 1.0, 2011-05-27 TLD5045EJ Application Information 8.3.3 Decentralized Light Module Application - DLM (Input configuration 2) In this particular input configuration two supply lines are tied together on the DLM. The following input states must be considered to distinguish between Light Function 1 (DRL mode) and Light Function 2 (PL mode). 1) Condition: DRL = ON, PL = OFF. Desired function: DRL mode (e.g. 400mA LED load current) 2) Condition: DRL = OFF, PL = ON. Desired function: PL mode (e.g. 50mA LED load current) 3) Condition: DRL = ON, PL =ON. Desired function: PL mode (e.g. 50mA LED load current) To achieve a lower mean LED load current during the PL mode the integrated PWM engine is a useful feature. The external RPWM and CPWM circuit predefines a dedicated PWM frequency and duty cycle. (for details refer to Figure 11) To simulate a module current during light load conditions the ST pin can be connected via resistors to both supply voltage lines. (refer to Chapter 7 for a detailed description of the ST behavior) For a decentralized solution without micro controller involvement the possibility to connect a PTC resistor at the SET pin is a cost effective solution to protect the LED load from thermal destruction. Vbat Wire Harness Inductance Decentralized Light Module Light Function 1 (e.g. DRL) Vbat BCM - module I LED Light Function 2 (e.g. PL) TDIM2 GND LSW IOpen_load 1 REN VREC SW 8 CREC 3 EN 7 GND 5 TDIM1 CPWM RPWM PWMI RFREQ FREQ R DIM1 CFREQ 6 RCOMP VREC I ST,PD ST 2 SET RSET TLD5045 Figure 16 4 RPTC Application Diagram of Decentralized Light Module without C (input config 2) This is a very simplified example of an application circuit. The function must be verified in the real application Datasheet 24 Rev. 1.0, 2011-05-27 TLD5045EJ Application Information 8.3.4 Decentralized Light Module Application - DLM (Input configuration 3) A permanent supply chooses the Light Function 1 (DRL mode) and a second dedicated PWM supply between 100Hz and 200Hz switches to Light Function 2 (PL mode). For this input configuration it is possible to connect the PWM dimming output of the BCM directly to the PWMI input of the TLD5045. To simulate a module current during light load conditions the ST pin can be connected via a resistor to the permanent supply voltage line. (refer to Chapter 7 for a detailed description of the ST behavior) For a decentralized solution without micro controller involvement the possibility to connect a PTC resistor at the SET pin is a cost effective solution to protect the LED load from thermal destruction. (for details refer to Figure 15) Vbat Wire Harness Inductance Decentralized Light Module I LED Light Function 1 (e.g. DRL) Vbat BCM - module Light Function 2 (e.g. PL) LSW GND CREC I Open_load 1 VREC SW 8 REN 3 EN RLIM 7 GND 5 DLIM REMC PWMI RFREQ FREQ CFREQ 6 RCOMP VREC I ST,PD ST 2 SET 4 RSET TLD5045 Figure 17 RPTC Application Diagram of Decentralized Light Module without C (input config 3) This is a very simplified example of an application circuit. The function must be verified in the real application Datasheet 25 Rev. 1.0, 2011-05-27 TLD5045EJ Package Outlines 9 Package Outlines 0.35 x 45 1.27 0.410.09 2) 0.2 M 0.19 +0.06 0.08 C Seating Plane C A-B D 8x 0.64 0.25 D 0.2 6 0.2 8 MAX. C 0.1 C D 2x 1.7 MAX. Stand Off (1.45) 0.1+0 -0.1 3.9 0.11) M D 8x Bottom View 8 1 5 1 4 8 4 5 2.65 0.2 3 0.2 A B 4.9 0.11) 0.1 C A-B 2x Index Marking 1) Does not include plastic or metal protrusion of 0.15 max. per side 2) Dambar protrusion shall be maximum 0.1 mm total in excess of lead width 3) JEDEC reference MS-012 variation BA Figure 18 PG-DSO-8-27-PO V01 Outline PG-DSO-8 EP Green Product (RoHS compliant) To meet the world-wide customer requirements for environmentally friendly products and to be compliant with government regulations the device is available as a green product. Green products are RoHS-Compliant (i.e Pb-free finish on leads and suitable for Pb-free soldering according to IPC/JEDEC J-STD-020). For further package information, please visit our website: http://www.infineon.com/packages. Datasheet 26 Dimensions in mm Rev. 1.0, 2011-05-27 TLD5045EJ Revision History 10 Revision History Version Date Rev. 1.0 2011-05-27 Initial Data sheet for TLD5045 Datasheet Changes 27 Rev. 1.0, 2011-05-27 Edition 2011-05-27 Published by Infineon Technologies AG 81726 Munich, Germany (c) 2011 Infineon Technologies AG All Rights Reserved. Legal Disclaimer The information given in this document shall in no event be regarded as a guarantee of conditions or characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, Infineon Technologies hereby disclaims any and all warranties and liabilities of any kind, including without limitation, warranties of non-infringement of intellectual property rights of any third party. Information For further information on technology, delivery terms and conditions and prices, please contact the nearest Infineon Technologies Office (www.infineon.com). Warnings Due to technical requirements, components may contain dangerous substances. For information on the types in question, please contact the nearest Infineon Technologies Office. Infineon Technologies components may be used in life-support devices or systems only with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered.