LT1871IMS-7-PBF datasheet(7/32 Pages) LINER

Part #	LT1871IMS-7-PBF

Description	High Input Voltage,Current Mode Boost, Flyback and SEPIC Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC1871-7

7

18717fc

PIN FUNCTIONS

MODE/SYNC (Pin 5): This input controls the operating

mode of the converter and allows for synchronizing the

operating frequency to an external clock. If the MODE/

SYNC pin is connected to ground, Burst Mode operation

is enabled. If the MODE/SYNC pin is connected to INTVCC,

or if an external logic-level synchronization signal is ap-

plied to this input, Burst Mode operation is disabled and

the IC operates in a continuous mode.

GND (Pin 6): Ground Pin.

GATE (Pin 7): Gate Driver Output.

INTVCC (Pin 8): The Internal 7V Regulator Output. The

gate driver and control circuits are powered from this

voltage. Decouple this pin locally to the IC ground with

a minimum of 4.7μF low ESR tantalum or ceramic ca-

pacitor. This 7V regulator has an undervoltage lockout

circuit with 5.6V and 4.6V rising and falling thresholds,

respectively.

VIN (Pin 9): Main Supply Pin. Must be closely decoupled

to ground.

SENSE (Pin 10): The Current Sense Input for the Control

Loop. Connect this pin to a resistor in the source of the

power MOSFET. Alternatively, the SENSE pin may be con-

nected to the drain of the power MOSFET, in applications

where the maximum VDS is less than 36V. Internal leading

edge blanking is provided for both sensing methods.

BLOCK DIAGRAM

+

1.230V

85mV

OV

50k

EA

UV

TO

START-UP

CONTROL

BURST

COMPARATOR

S

R

Q

LOGIC

PWM LATCH

CURRENT

COMPARATOR

0.30V

1.230V

7V

5.6V UP

4.6V DOWN

1.230V

SLOPE

1.230V

ILOOP

FB

ITH

gm

3

MODE/SYNC

5

FREQ

4

2

INTVCC

8

LDO

V-TO-I

OSC

V-TO-I

SLOPE

COMPENSATION

BIAS AND

START-UP

CONTROL

VIN

BIAS

VREF

IOSC

RLOOP

–

+

–

+

C1

SENSE

10

GND

18717 BD

6

GATE

INTVCC

GND

7

VIN

1.248V

9

RUN

C2

1

0.6V

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