HA16114FPJ 데이터 시트보기 (PDF) - Renesas Electronics

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HA16114FPJ

Switching Regulator for Chopper Type DC/DC Converter

Renesas Electronics 

HA16114P/PJ/FP/FPJ, HA16120FP/FPJ

Application Examples (3)

• External Synchronization with Primary-Control AC/DC Converter (cont.)

(2) Combination with a forward AC/DC converter (simplified schematic)

DFG1C8

D

Input

HRW26F

HA17431 and optocoupler

+

C

A

B

SBD

module

Feedback

section

Main DC

output

HA16107,

HA16666 etc.

−

2SC458

R3

390Ω

FB

VIN

Switching transformer

R1

Coil A Primary, for main

Coil B Secondary, for output

Coil C Tertiary, for IC

R2

Coil D For reset

6.2kΩ

Q

510Ω

2

10

SYNC

VIN

HA16114,

HA16120

OUT

ZD

GND

1

9

Other parts as

on previous page

This circuit illustrates the combination of the HA16114/120 with a forward AC/DC converter. The

HA16114/120 synchronizes with the falling edge of the external sync signal, so with a forward

transformer, the sync pulses must be inverted. In the diagram, this is done by an external circuit

consisting of the following components:

• Q:

Transistor for inverting the pulses. Use a small-signal transistor.

• R1 and R2: These resistors form a voltage divider for driving the base of transistor Q. R2 also provides

a path for base discharge, so that the transistor can turn off quickly.

• R3:

• ZD:

Load resistor for transistor Q.

Zener diode for protecting the SYNC pin.

Rev.2.0, Sep.18.2003, page 34 of 37

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