www.fairchildsemi.com KA7500C SMPS Controller Features Description • Internal Regulator Provides a Stable 5V Reference Supply Trimmed to ±1% Accuracy. • 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 KA7500C is used for the control circuit of the pulse width modulation switching regulator. The KA7500C consists of 5V reference voltage circuit, two error amplifiers, 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. The precision of voltage reference (Vref) is improved up to ±1% with trimming. This provides a better output voltage regulation. The operating temperature range is -25°C ~ +85°C. 16-DIP 16-SOP 1 1 Internal Block Diagram OUTPUT CONTROL 13 RT 6 CT 5 OSCILLATOR D 8 C1 9 E1 Q 11 C2 CK DEAD 4 TIME CONTROL 1.2V 10 E2 PWM COMP EA(+) 1 EA(-) 5V + _ 1 BAND GAP REFERENCE 2 EA(+) 16 EA(-) 15 Q 14 VREF 0.7MA + _ 12 VCC 7 GND 2 3 COMP INPUT Rev. 1.0.1 ©2003 Fairchild Semiconductor Corporation KA7500C Absolute Maximum Ratings Parameter Symbol Value Unit VCC 42 V VC 42 V Supply Voltage Collector Supply Voltage Output Current IO 250 mA Amplifier Input Voltage VIN VCC +0.3 V Power Dissipation (TA = 25°C) PD 1 (KA7500C) 0.9 (KA7500CD) W Operating Temperature Range TOPR -25 ~ +85 °C Storage Temperature Range TSTG -65 ~ +150 °C Tj 125 °C Junction Temperature Recommended Operating Conditions Parameter Power Supply Voltage Collector Output Voltage Min. Typ. Max. Unit VCC 7.0 15 40 V VC1,VC2 - 30 40 V IC1,IC2 - - 200 mA Amplifier Input Voltage VIN 0.3 - VCC-2.0 V Current Into Feedback Terminal Ifb - - 0.3 mA Reference Output Current Iref - - 10 mA Timing Resistor RT 1.8 30 500 ΚΩ Timing Capacitor CT 0.0047 0.001 10 uF Oscillator Frequency fosc 1.0 40 200 kHz - 0.3 - 5.3 V Collector Output Current (Each Transistor) PWM Input Voltage (Pins3, 4, 13) 2 Symbol KA7500C Electrical Characteristics (VCC = 20V, f = 10kHz, TA = -25°C to +85°C, unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit REFERENCE SECTION Reference Output Voltage VREF Line Regulation RLine Load Regulation RLOAD Short Circuit Output Current ISC IREF = 1mA, TA=25°C(Note1) 4.95 5.0 5.05 IREF = 1mA 4.9 5.0 5.1 V VCC = 7V to 40V - 2.0 25 mV IREF = 1mA to 10mA - 1.0 15 mV 10 35 50 mA - 40 - CT = 0.001µF, RT = 12KΩ,TA=25°C 9.2 10 10.8 CT = 0.001µF, RT = 30KΩ, TA=Tlow to Thigh 9.0 - 12 VREF = 0V OSCILLATOR SECTION CT = 0.001µF, RT = 30KΩ Oscillation Frequency Frequency Change with Temperature fosc kHz ∆f/∆T CT = 0.01µF, RT = 12KΩ - - 2 % IBIAS VCC = 15V, 0V ≤ V4 ≤ 5.25V - -2.0 -10 µA 45 - - % Zero Duty Cycle - 3.0 3.3 Max. Duty Cycle 0 - - DEAD TIME CONTROL SECTION Input Bias Current Maximum Duty Cycle Input Threshold Voltage D(MAX) 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 µA Common Mode Input Voltage VCM 7V ≤ VCC ≤ 40V -0.3 - VCC V Open-Loop Voltage Gain GVO 0.5V ≤ V3 ≤ 3 .5V Unit-Gain Bandwidth BW - 70 95 - dB - 650 - kHz - 4 4.5 V -0.3 -0.7 - mA - 1.1 1.3 V PWM COMPARATOR SECTION Input Threshold Voltage VITH Zero Duty Cycle Input Sink Current ISINK V3 = 0.7V OUTPUT SECTION Output Saturation Voltage Common Emitter VCE(SAT) VE = 0V, IC = 200mA 3 KA7500C Electrical Characteristics (Continued) (VCC = 20V, f = 10kHz, TA = -25°C to +85°C, unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Unit VCC(SAT) VC = 15V, IE = -200mA - 1.5 2.5 V Collector Off-State Current IC(OFF) VCC = 40V, VCE = 40V - 2 100 µA Emitter Off-State Current IE(OFF) VCC = VC = 40V, VE = 0V - - -100 - ICC Pin 6 = VREF, VCC = 15V - 6 10 mA tR - - 100 200 ns tF - - 25 100 ns Emitter-Follower TOTAL DEVICE Supply Current OUTPUT SWITCHING CHARACTERISTIC Rise Time Common Emitter, Common Collector Fall Time Common Emitter, Common Collector Note : 1. This is guaranteed where the marking code of the package surface is over 027 4 KA7500C Typical Application Pulse Width Modulated Step-down Converter KSA1010 VI =10V to 40V VO=5V IO=1A 1mH, 2A 47Ω 150Ω 0.1uF 12 VCC 50uF 10V + 3 COMP INPUT 8 C1 11 C2 1MΩ -2 5.1KΩ VREF 14 5.1KΩ KA7500C - 15 5.1KΩ +1 150Ω D.T 4 GND 7 E1 9 E2 10 O.C 13 RT 6 CT 5 + 16 + + 50uF 50V 47KΩ + 0.001uF 500uF 10V GND 0.1 5 KA7500C Mechanical Dimensions Package Dimensions in millimeters 16-SOP 0.51 ) 0.020 0.05 0.002 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~ +0.004 0.008 -0.002 0.20 +0.10 -0.05 6.00 ±0.30 0.236 ±0.012 5.72 0.225 +0.10 -0.05 #9 0.406 #8 9.90 ±0.20 0.39 ±0.008 #16 10.30 MAX 0.405 #1 ( 1.55 ±0.10 0.061 ±0.004 +0.004 0.016 -0.002 MIN KA7500C Mechanical Dimensions (Continued) Package Dimensions in millimeters 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 7 KA7500C Ordering Information Product Number Package KA7500C 16-DIP KA7500CD 16-SOP Operating Temperature -25 ~ +85°C 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 5/9/03 0.0m 001 Stock#DSxxxxxxxx 2003 Fairchild Semiconductor Corporation