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KA7500C

SMPS Controller
Features
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

Description
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 CT 6 OSCILLATOR 5 D Q 9 E1 8 C1

11 C2 DEAD 4 TIME CONTROL CK
1.2V

Q

10 E2
PWM COMP

EA( ) 1 EA(-) 2

5V

12 VCC

1 0.7MA 2

BAND GAP REFERENCE

14 VREF

EA( ) 16 EA(-) 15

7 GND

3

COMP INPUT

Rev. 1.0.1
2003 Fairchild Semiconductor Corporation

KA7500C Datasheet Fairchild Download PDF

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KA7500C DATASHEET