www.fairchildsemi.com KA7500B SMPS Controller Features Description * Internal Regulator Provides a Stable 5V Reference Supply Trimmed to 5% * Uncommitted Output TR for 200mA Sink or Source Current * Output Control For Push-Pull or Single Ended Operation * Variable Duty Cycle By Dead Time Control (Pin 4) Complete PWM Control Circuit * On-Chip Oscillator With Master or Slave Operation * Internal Circuit Prohibits Double Pulse at Either Output The KA7500B is used for the control circuit of the PWM switching regulator. The KA7500B consists of 5V reference voltage circuit, two error amplifiers, a flip flop, an output control circuit, a PWM comparator, a dead time comparator and an oscillator. This device can be operated in the switching frequency of 1kHz to 300kHz. 16-DIP 1 16-SOP 1 Internal Block Diagram Rev. 1.0.0 (c)2002 Fairchild Semiconductor Corporation KA7500B Absolute Maximum Ratings Parameter Value Unit VCC 42 V Collector Supply Voltage VC 42 V Output Current IO 250 mA Amplifier Input Voltage VIN VCC +0.3 V Power Dissipation (TA = 25C) PD 1 (KA7500B) 0.9 (KA7500BD) W Operating Temperature Range TOPR 0 ~ +70 C Storage Temperature Range TSTG -65 ~ +150 C Supply Voltage 2 Symbol KA7500B Electrical Characteristics (VCC = 20V, f = 10kHz, TA = 0C to +70C, unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit 4.75 5.0 5.25 V REFERENCE SECTION Reference Output Voltage VREF VREF VCC = 7V to 40V - 2.0 25 mV VREF/T TA = 0C to 70C - 0.01 0.03 %/C IREF = 1mA to 10mA - 1.0 15 mV 10 35 50 mA Line Regulation Temperature Coefficient of VREF IREF = 1mA VREF Load Regulation Short-Circuit Output Current ISC VREF = 0V OSCILLATOR SECTION Oscillation Frequency Frequency Change with Temperature f CT = 0.01F, RT = 12k - 10 - kHz f/T CT = 0.01F, RT = 12k - - 2 % IBIAS VCC = 15V, 0VV45.25V - -2.0 -10 A 45 - - % Zero Duty Cycle - 3.0 3.3 Max. Duty Cycle 0 - - DEAD TIME CONTROL SECTION Input Bias Current Maximum Duty Cycle D(MAX) Input Threshold Voltage VITH VCC = 15V, V4 = 0V O.C Pin = VREF V ERROR AMP SECTION Input Offset Voltage VIO V3 = 2.5V - 2.0 10 mV Input Offset Current IIO V3 = 2.5V - 25 250 mA Input Bias Current IBIAS V3 = 2.5V - 0.2 1.0 A Common Mode Input Voltage VCM 7V VCC 40V -0.3 - VCC V Open-Loop Voltage Gain GVO 0.5V V3 3 .5V 70 95 - dB Unit-Gain Bandwidth (Note1) BW - - 650 - kHz Input Threshold Voltage VITH Zero Duty Cycle Input Sink Current ISINK V3=0.7V PWM COMPARATOR SECTION - 4 4.5 V -0.3 -0.7 - mV OUTPUT SECTION Output Saturation Voltage Common Emitter VCE(SAT) VE = 0, IC = 200mA - 1.1 1.3 Common Collector VCC(SAT) VC = 15V, IE = -200mA - 1.5 2.5 Collector Off-State Current IC(OFF) VCC = 40V, VCE = 40V - 2 100 Emitter Off-State Current IE(OFF) VCC = VC = 40V, VE = 0 - - -100 ICC Pin 6 = VREF, VCC = 15V - 6 10 mA - V A TOTAL DEVICE Supply Current OUTPUT SWITCHING CHARACTERISTICS tR - - - - Common Emitter - - - 100 200 Common Collector - - - 100 200 Fall Time tF - - - - Common Emitter - - - 25 100 Common Collector - - - 40 100 Rise Time ns ns Note: 1. This parameter, although guaranteed, is not 100% tested in production. 3 KA7500B Typical Application Pulse Width Modulated Step-down Converter KSA1010 VI=10V to 40V Vo=5V Io=1A 1mH,2A 47 150 0.1uF 1M 50uF 10V 5.1k 12 Vcc 11 C2 8 C1 3 COMP INPUT -2 VREF 14 5.1k - 15 KA7500B 5.1k +1 D.T GND E1 9 4 7 E2 10 O.C 13 RT 6 CT 5 +16 150 + + 50uF 50V + 47k 50uF 10V 0.001uF GND 0.1 4 KA7500B Mechanical Dimensions Package 16-DIP #9 7.62 0.300 2.54 0.100 1.50 0.10 0.059 0.004 #8 0.46 0.10 0.018 0.004 #16 19.80 MAX 0.780 #1 19.40 0.20 0.764 0.008 ( 0.81 ) 0.032 6.40 0.20 0.252 0.008 3.25 0.20 0.128 0.008 5.08 MAX 0.200 0.38 0.014 MIN 3.30 0.30 0.130 0.012 +0.10 0~15 0.25 -0.05 +0.004 0.010 -0.002 5 KA7500B Mechanical Dimensions (Continued) Package 16-SOP 0.05 0.002 0.51 ) 0.020 MIN #9 0.70 0.20 0.0275 0.008 6 1.27 0.050 1.80 MAX 0.071 8 MAX0.10 MAX0.004 3.95 0.20 0.156 0.008 0~ +0.10 0.20 -0.05 +0.004 0.008 -0.002 6.00 0.30 0.236 0.012 5.72 0.225 +0.10 0.406 -0.05 +0.004 0.016 -0.002 #8 9.90 0.20 0.39 0.008 #16 10.30 MAX 0.405 #1 ( 1.55 0.10 0.061 0.004 KA7500B Ordering Information Product Number Package KA7500B 16-DIP KA7500BD 16-SOP Operating Temperature 0 ~ +70C 7 KA7500B DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com 9/10/02 0.0m 001 Stock#DSxxxxxxxx 2002 Fairchild Semiconductor Corporation