LT1725IS Просмотр технического описания (PDF) - Linear Technology

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производитель

LT1725IS

General Purpose Isolated Flyback Controller

Linear Technology 

LT1725

PI FU CTIO S

ENDLY (Pin 13): Pin for external programming resistor to

set enable delay time. See Applications Information for

details.

tON (Pin 14): Pin for external programming resistor to set

switch minimum on time. See Applications Information

for details.

VCC (Pin 15): Supply voltage for the LT1725. Bypass this

pin to ground with 1µF or more.

GATE (Pin 16): This is the gate drive to the external power

MOSFET switch and has large dynamic currents flowing

through it. Keep the trace to the MOSFET as short as

possible to minimize electromagnetic radiation and volt-

age spikes. A series resistance of 5Ω or more may help to

dampen ringing in less than ideal layouts.

BLOCK DIAGRA

VCC

UVLO

BIAS

OSCAP

OSC

3VOUT

3V REG

(INTERNAL)

tON MINENAB ENDLY

LOGIC

MOSFET

DRIVER

PGND

COMP

IAMP

FB

FDBK

SOFT-START

LOAD

COMPENSATION

GATE

ISENSE

SGND

VC

SFST

1725 BD

ROCMP RCMPC

1725fa

7

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