LT3798EMSE Просмотр технического описания (PDF) - Linear Technology

Номер в каталоге

Компоненты Описание

Список матч

LT3798EMSE

Isolated No Opto-Coupler Flyback Controller with Active PFC

Linear Technology 

LT3798

PIN FUNCTIONS

GATE (Pin 14): N-Channel FET Gate Driver Output. Switches

between INTVCC and GND. Driven to GND during shutdown

state and stays high during low voltage states.

SENSE (Pin 15): The Current Sense Input for the Control

Loop. Kelvin connect this pin to the positive terminal of the

switch current sense resistor, RSENSE, in the source of the

NFET. The negative terminal of the current sense resistor

should be connected to the GND plane close to the IC.

VIN_SENSE (Pin 16): Line Voltage Sense Pin. The pin is

used for sensing the AC line voltage to perform power

factor correction. Connect a resistor in series with the

line voltage to this pin. If no PFC is needed, connect this

pin to INTVCC with a 25k resistor.

GND (Exposed Pad Pin 17): Ground. The exposed pad

of the package provides both electrical contact to ground

and good thermal contact to the printed circuit board.

The exposed pad must be soldered to the circuit board

for proper operation.

BLOCK DIAGRAM

D2

•

R13

R4

L1C

C1

R5

R15

R14

DCM

EN/UVLO VIN_SENSE

VRECTIFIED

R3

C3

VIN

R1

C2

D1

T1

VOUT +

L1A

L1B

C7

N:1

VOUT –

R8 VREF

OVP

R9 COMP+

C6

COMP–

S&H

A9

FB

R12

1M

CTRL1

–

CTRL2

+A5

CTRL3

FB

VC

1.22V

S&H

+

–A8

R10

C4

STARTUP

INTERNAL REG

+

+ –A2

600mV

–

ONE

SHOT

A3

1.22V –

+A7

CURRENT

COMPARATOR

+

–A1

SR

Q

S

MASTER

LATCH

SW1

A4

MINIMUM

A6

MULTIPLIER

LOW OUTPUT

CURRENT

OSCILLATOR

INTVCC

R7

C5

R11

GATE

DRIVER

SENSE

GND

R6

3798 BD

3798fa

7

Share Link: