SC4910AITSTRT datasheet(1/19 Pages) SEMTECH

tên linh kiện	SC4910AITSTRT

Giải thích chi tiết về linh kiện	High Performance Secondary Side Controller with Synchronous Rectifier

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SC4910A/B

High Performance Secondary Side

Controller with Synchronous Rectifier

POWER MANAGEMENT

Revision: June 1, 2005

Description

Features

Applications

Typical Application Circuit

Synchronous rectification with adaptive control

Programmable secondary side delay

Programmable switching frequency

Programmable max. duty cycle

Remote voltage sense capability

Close-loop soft start with active low shutdown

0.75V precision reference for low output applications

Oscillator sychronization

Undervoltage Lockout

Operation to 1MHz

Current-mode or voltage-mode operation

Single stage power conversion with multiphase link

capability (with SC4201)

Monotonic start-up with pre-biased output

Active current sharing capability

20 pin TSSOP package

The SC4910A/B is an integrated, full featured, second-

ary side controller designed for use in single ended and

isolated switch mode power supplies with synchronous

rectification where efficiency and fast transient response

are of primary concern. The SC4910A/B has outputs for

both primary FET and secondary synchronous rectifica-

tion. The primary drive output is designed to drive a small

and low cost pulse transformer to isolate the primary

FET driver. The secondary control makes it much easier

to monitor and control the system load with tight control

loops and implement load current sharing and synchro-

nous rectification.

The SC4910A/B features synchronous rectification, multi-

phase link capability, programmable secondary side

delay, programmable switching frequency and program-

mable maximum duty cycle. It is designed for either

current mode or voltage mode operation.

The SC4910A has a typical turn-on threshold of 9V and

the SC4910B has a threshold of 4.5V.

+12V

C4

LOAD

C6

T3

R3

C5

C1

M1

SC1301

M2

R8

C10

R4

R7

T2

C2

R2

R6

L1

D2

SC4910

18

17

11

12

6

4

8

7

20

19

3

1

15

2

5

10

FB

COMP

OUTB

ISHARE

PHASE

CS

OUTA

PGND

RT1

RT2

SS

-SENSE

DELAY

SYNC/EN

VREF

PVCC

M3

SC1301

D3

C8

+Vin

R1

C9

SC1301

R9

C3

D1

R5

T1

16

13

14

PVCC

AVCC

9

PGND

AGND

Telecom isolated DC to DC converters

Isolated VRMS

Networking power supplies

Industrial power supplies

Distributed power architectures

High density power modules

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nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Semtech Corporation	SC4910AITSTRT	320Kb / 19P	High Performance Secondary Side Controller with Synchronous Rectifier

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