STSR3

更新时间： 2024-01-12 22:46:02

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		驱动
页数	文件大小	规格书
12页	271K
描述
SYNCHRONOUS RECTIFIERS SMART DRIVER FOR FLYBACK

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中文翻译

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数据手册

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STSR3 数据手册

STSR3

SYNCHRONOUS RECTIFIERS

SMART DRIVER FOR FLYBACK

■

SUPPLY VOLTAGE RANGE: 4V TO 5.5V

TYPICAL PEAK OUTPUT CURRENT:

(SOURCE 2A, SINK 3.5A)

■

OPERATING FREQUENCY: 30 TO 750 KHz

SMART TURN-OFF ANTICIPATION TIMING

AUTOMATIC TURN OFF FOR DUTY CYCLE

LESS THAN 14%

■

POSSIBILITY TO OPERATE IN

DISCONTINUOUS MODE

SO-8

switch providing anticipation in turn-off the output.

This smart function is implemented by a fast

cycle-after-cycle logic control mechanism, based

on a high frequency oscillator synchronized by the

clock signal. This anticipation is externally set

through external component. A special Inhibit

function allows to shut-off the drive output. This

feature makes discontinuous conduction mode

possible and avoids reverse conduction of the

synchronous rectifier.

DESCRIPTION

STSR3 Smart Driver IC provides a high current

outputs to properly drive secondary Power

Mosfets used as Synchronous Rectifier in low

output

voltage,

high

efficiency

Flyback

Converters. From a synchronizing clock input,

withdrawn on the secondary side of the isolation

transformer, the IC generates a driving signal with

set dead times with respect to the primary side

PWM signal.

The IC operation prevents secondary side

shoot-through conditions at turn-on of the primary

SCHEMATIC DIAGRAM

Vcc

5.7V

BIAS

UVLO

PEAK

DETECTOR

ANTICIPATION

SET

SETANT

OUTPUT

BUFFER

HIGH

FREQUENCY

OSCILLATOR

DIGITAL

OUT_GATE

CONTROL

INHIBIT

N/C

25mV

SGLGND

PWRGND

June 2003

1/12

12 3 4 5 6 7...12

中文翻译

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