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KA7500B
SMPS Controller
Features
* 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
Description
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 Supply Voltage Collector Supply Voltage Output Current Amplifier Input Voltage Power Dissipation (TA = 25C) Operating Temperature Range Storage Temperature Range Symbol VCC VC IO VIN PD TOPR TSTG Value 42 42 250 VCC +0.3 1 (KA7500B) 0.9 (KA7500BD) 0 ~ +70 -65 ~ +150 Unit V V mA V W C C
2
KA7500B
Electrical Characteristics
(VCC = 20V, f = 10kHz, TA = 0C to +70C, unless otherwise specified) Parameter
REFERENCE SECTION Reference Output Voltage Line Regulation Temperature Coefficient of VREF Load Regulation Short-Circuit Output Current OSCILLATOR SECTION Oscillation Frequency Frequency Change with Temperature DEAD TIME CONTROL SECTION Input Bias Current Maximum Duty Cycle Input Threshold Voltage ERROR AMP SECTION Input Offset Voltage Input Offset Current Input Bias Current Common Mode Input Voltage Open-Loop Voltage Gain Unit-Gain Bandwidth (Note1) PWM COMPARATOR SECTION Input Threshold Voltage Input Sink Current OUTPUT SECTION Output Saturation Voltage Common Emitter Common Collector Collector Off-State Current Emitter Off-State Current TOTAL DEVICE Supply Current OUTPUT SWITCHING CHARACTERISTICS Rise Time Common Emitter Common Collector Fall Time Common Emitter Common Collector tR tF 100 100 25 40 200 200 100 100 ns ns ICC Pin 6 = VREF, VCC = 15V 6 10 mA VCE(SAT) VCC(SAT) IC(OFF) IE(OFF) VE = 0, IC = 200mA VC = 15V, IE = -200mA VCC = 40V, VCE = 40V VCC = VC = 40V, VE = 0 1.1 1.5 2 1.3 2.5 100 -100 V A VITH ISINK Zero Duty Cycle V3=0.7V -0.3 4 -0.7 4.5 V mV VIO IIO IBIAS VCM GVO BW V3 = 2.5V V3 = 2.5V V3 = 2.5V 7V VCC 40V 0.5V V3 3 .5V -0.3 70 2.0 25 0.2 95 650 10 250 1.0 VCC mV mA A V dB kHz IBIAS D(MAX) VITH VCC = 15V, 0VV45.25V VCC = 15V, V4 = 0V O.C Pin = VREF Zero Duty Cycle Max. Duty Cycle 45 0 -2.0 3.0 -10 3.3 A % V f f/T CT = 0.01F, RT = 12k CT = 0.01F, RT = 12k 10 2 kHz % VREF VREF VREF/T VREF ISC IREF = 1mA VCC = 7V to 40V TA = 0C to 70C IREF = 1mA to 10mA VREF = 0V 4.75 10 5.0 2.0 0.01 1.0 35 5.25 25 0.03 15 50 V mV %/C mV mA
Symbol
Conditions
Min.
Typ.
Max.
Unit
Note: 1. This parameter, although guaranteed, is not 100% tested in production.
3
KA7500B
Typical Application
Pulse Width Modulated Step-down Converter
VI=10V to 40V
KSA1010
1mH,2A
Vo=5V Io=1A
47
150 0.1uF 1M 50uF 10V 5.1k 12 Vcc 11 C2 8 C1 3 COMP INPUT -2 VREF 14 5.1k
KA7500B
- 15 5.1k +1 +16 150
D.T GND E1 9 4 7 +
50uF 50V
E2 10
O.C 13
RT 6
CT 5
+ + 47k
50uF 10V
0.001uF
GND
0.1
4
KA7500B
Mechanical Dimensions
Package
16-DIP
0.81 ) 0.032
#16 6.40 0.20 0.252 0.008
#1
(
19.80 MAX 0.780
19.40 0.20 0.764 0.008
#8
#9
7.62 0.300
3.25 0.20 0.128 0.008
0.38 0.014 MIN
5.08 MAX 0.200
3.30 0.30 0.130 0.012
0~15
0.25 -0.05 0.010 -0.002
+0.004
+0.10
2.54 0.100
0.46 0.10 0.018 0.004
1.50 0.10 0.059 0.004
5
KA7500B
Mechanical Dimensions (Continued)
Package
16-SOP
MIN
1.55 0.10 0.061 0.004 #1 #16
10.30 MAX 0.405
9.90 0.20 0.39 0.008
#8
#9
6.00 0.30 0.236 0.012 3.95 0.20 0.156 0.008
1.80 MAX 0.071
+0.10 0.20 -0.05 +0.004 0.008 -0.002
5.72 0.225 0.70 0.20 0.0275 0.008
6
0~
8
MAX0.10 MAX0.004
1.27 0.050
+0.10 0.406 -0.05 +0.004 0.016 -0.002
(
0.51 ) 0.020
0.05 0.002
KA7500B
Ordering Information
Product Number KA7500B KA7500BD Package 16-DIP 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.
www.fairchildsemi.com 9/10/02 0.0m 001 Stock#DSxxxxxxxx 2002 Fairchild Semiconductor Corporation
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.

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