FAN7621 データシートの表示（PDF） - Fairchild Semiconductor

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FAN7621

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

L lk Np

Lm

D1

Ns

VO

Ns

D2

CF RF

KA431

Rsense

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

Block Diagram

VREF

ICTC

ICTC

2ICTC

2V

RT 8

CON 6

LVCC

I OLP

-

0.4 / 0.6 V

+

+

OLP

5V

-

LVCC

+

23 V

-

OVP

+

3V

-

1V

+

-

LVCC

12

SQ

R -Q

F/F

+

LVCC good VREF

11.3 / 14.5V -

8.7 / 9.2V

Internal

HVCC good

Bias

Counter (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

FAN7621 • Rev. 1.0.1

2

www.fairchildsemi.com

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