FAN7621_10 datasheet(2/17 Pages) FAIRCHILD

Part #	FAN7621

Description	PFM Controller for Half-Bridge Resonant Converters

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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FAN7621 • Rev. 1.0.3

2

Application Circuit Diagram

R

sense

C

DL

VCC

LVcc

RT

CON

CS

SG

PG

CTR

HV

CC

Cr

L

lk

Lm

Ns

VO

D1

D2

R

F

C

F

Np

Ns

KA431

VIN

HO

LO

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

Block Diagram

OLP

TSD

LVCC good

Low-Side

Gate Drive

High-Side

Gate Drive

6

1

12

11.3 / 14.5V

VREF

Internal

Bias

LVCC good

3

HO

CS

CON

LVCC

HVCC

CTR

R

T

VAOCP

PG

LVCC

OVP

Time

Delay

2

8

16

9

Time

Delay

+

-

V

OCP

+

-

+

-

+

-

+

-

-Q

Q

R

S

LVCC <5V

Latch

Protection

-Q

Q

R

S

Auto-restart

Protection

+

-

0.4 / 0.6 V

5V

23 V

0.58 V

0.9 V

8.7 / 9.2V

HVCC good

I

CTC

+

-

+

-

3V

1V

-Q

Q

R

S

F/F

Level-Shift

Balancing

Delay

Shutdown without delay

50ns Delay

-1

2I

CTC

VREF

I

CTC

350ns

10

SG

Delay

1.5µs

2V

Counter (1/4)

LVCC

I

OLP

14

LO

Figure 2. Internal Block Diagram

Similar Part No. - FAN7621_10

Manufacturer	Part #	Datasheet	Description
Fairchild Semiconductor	FAN7621B	1,021Kb / 17P	PFM Controller for Half-Bridge Resonant Converters
ON Semiconductor	FAN7621B	813Kb / 18P	PFM Controller for Half-Bridge Resonant Converters Rev. 1.0.1
Fairchild Semiconductor	FAN7621BSJ	1,021Kb / 17P	PFM Controller for Half-Bridge Resonant Converters
ON Semiconductor	FAN7621BSJ	813Kb / 18P	PFM Controller for Half-Bridge Resonant Converters Rev. 1.0.1
Fairchild Semiconductor	FAN7621BSJX	1,021Kb / 17P	PFM Controller for Half-Bridge Resonant Converters

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Similar Description - FAN7621_10

Manufacturer	Part #	Datasheet	Description
Fairchild Semiconductor	FAN7621S	803Kb / 13P	PFM Controller for Half-Bridge Resonant Converters
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FAN7621 Datasheet(PDF) 2 Page - Fairchild Semiconductor

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