APW38HC45A データシートの表示（PDF） - Anpec Electronics

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APW38HC45A

CMOS Current-Mode PWM Voltage Controller

Anpec Electronics 

APW38HC42A/3A/4A/5A

Selection Guide

Duty Cycle

0~96%

0~50%

Block Diagram

Startup 8.4V

Minimum Operating 7.6V

APW38HC43A

APW38HC45A

Startup 14.5V

Minimum Operating 9V

APW38HC42A

APW38HC44A

VDD

VREF

5V

Reference

UVLO

RT/CT

Oscillator

OUT

FB

-

E. A.

2.5V +

2R

-

R

+

TQ

S

Q

R

COMP

GND

ISNS

Functional Pin Description

Pin Name

1

Pin Number

COMP

2

FB

3

ISNS

4

RT/CT

5

GND

6

OUT

7

VDD

8

VREF

Copyright  ANPEC Electronics Corp.

Rev. A.7 - Jan., 2003

Function Description

Compensation: Connect external compensation network to

modify the error amplifier output.

Feedback (Input): Error amplifier input. Feedback is 2.5V at

desired output voltage.

Current Sense (Input): Current sense comparator input.

Connect to current sensing resistor or current transformer.

Timing Resistor/Timing Capacitor: Connect external RC

network to select switching frequency.

Ground: Combined analog and power ground.

Power Output: Totem-pole output.

Analog Supply (Input): Controller circuitry supply input. Return

to analog ground (AGND).

5V Reference (Output): Connect external RC network.

2

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