FAN7621SSJX View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

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FAN7621SSJX

PFM Controller for Half-Bridge Resonant Converters

Fairchild Semiconductor 

Application Circuit Diagram

Cr

VIN

VCC

VO

LVCC

HVCC

Rmax

Rmin

RT

Rss

HO

CTR

AR

Css

LO

CS

SG PG

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

Block Diagram

Vre f

IR T

RT 8

Vre f

IR T

3V

2IR T

1V

2V

AR 6

5k

VC s s H/ VC s s L

LVCC

12

S

Q

R

D ivider

LV good

CC

Vre f

L U V+ / L U V-

In tern al

B ias

T im e

D elay

3 5 0n s

Level

S hifter

H UV+ / H UV-

H ig h S ide

Gate D river

T im e

D elay

3 5 0n s

B alancin g

D elay

L ow S ide

Gate D river

1 HVcc

3 HO

2 CTR

14 LO

L VC C

VO V P

LV g o od

CC

TSD

D elay

50ns

D elay

1.5µs

S

Q

R

Sh utd own with o ut delay

VA O C P

VO C P

-1

16 PG

10 SG

9

CS

Figure 2. Internal Block Diagram

© 2009 Fairchild Semiconductor Corporation

FAN7621S • Rev. 1.0.1

2

www.fairchildsemi.com

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