FAN7621B Просмотр технического описания (PDF) - Fairchild Semiconductor

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FAN7621B

PFM Controller for Half-Bridge Resonant Converters

Fairchild Semiconductor 

Application Circuit Diagram

VCC

CDL

VIN

LVCC

HVCC

RT

HO

CON

CTR

LO

CS

SG PG

Cr

Llk Np

Lm

D1

Ns

VO

Ns

D2

KA431

CF RF

Rsense

Figure 1. Typical Application Circuit (LLC Resonant Half-Bridge Converter)

Block Diagram

VREF

ICTC

ICTC

2ICTC

2V

RT 8

CON 6

LVCC

IOLP

-

0.4 / 0.6 V

+

+

OLP

5V

-

LVCC

+

23 V

-

OVP

+

3V

-

1V

+

-

SQ

R -Q

F/F

LVCC

12

+

10.0 / 12.5 V -

LVCC good VREF

Internal

Bias

8.7 / 9.2 V

HVCC good

Coun ter (1/4)

Time

Delay

350ns

Level-Shift

High-Side

Gate Drive

1 HVCC

3 HO

2 CTR

Time

Delay

350ns

Balancing

Delay

Low-Side

Gate Drive

LVCC good

SQ

R -Q

Auto-restart

protection

QS

-Q R

Latch

protection

Shutdown without delay

50ns delay

+

-

0.9 V

VAOCP

TSD

LVCC < 5V

-

Delay

1.5μs

+

VOCP

0.58 V

Figure 2. Internal Block Diagram

-1

9

CS

14 LO

16 PG

10 SG

© 2009 Fairchild Semiconductor Corporation

FAN7621B • Rev. 1.0.1

2

www.fairchildsemi.com

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