LT1509INPBF Linear Technology Corporation, LT1509INPBF Datasheet

LT1509INPBF

Manufacturer Part Number

LT1509INPBF

Description

DIP20

Manufacturer

Linear Technology Corporation

Datasheet

1.LT1509INPBF.pdf (16 pages)

Specifications of LT1509INPBF

Date_code

10+

Current page: 1 of 16
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APPLICATIONS

BLOCK

FEATURES

SS2

NOTE: PWM PULSE IS DELAYED BY 55% DUTY CYCLE AFTER PFC PULSE

SENSE

OVP

SS1

PFC and PWM Single Chip Solution

Synchronized Operation up to 300kHz

99% Power Factor over 20:1 Load Current Range

Current Mode PWM

Instantaneous Overvoltage Protection

Dedicated Overvoltage Protection (OVP Pin)

Minimal Line Current Dead Zone

Typical 250 A Start-Up Supply Current

Line Switching Noise Filter

Low Quiescent Current: 13mA

Fast 2A Peak Current Gate Drivers

Separate Soft Start Controls

Universal Power Factor Corrected Power Supplies

and Preregulators

16V TO 10V

14 A

7.5V

7.9V

14 A

DIAGRAM

PWM0K

–

7V to

4.7V

OUT

2.2V

25k

–

7.5V

REF

RUN

–

RAMP

200 A

–

REF

–

1.2V

7 A

OUT

SENSE

50 A

–

DESCRIPTION

The LT

switching power supplies utilizing active power factor

correction. The PFC section is identical to the LT1248 PFC

controller except the EN/SYNC pin is removed because

PFC and PWM are synchronized internally.

The current mode PWM section (the LT1508 is the volt-

age-mode counterpart) contains all the primary side func-

tions to convert the PFC preregulated high voltage output

to an isolated low voltage output. The PWM duty cycle is

internally limited to 47% (maximum 50%) to prevent

transformer saturation. PWM soft start begins when PFC

output reaches the preset voltage. In the event of brief line

loss, the PWM will be shut off when the PFC output voltage

drops below 73% of the preset value.

, LTC and LT are registered trademarks of Linear Technology Corporation.

–

1509 is a complete solution for universal off-line

SET

OUT

0.7V

–

OSC

Power Factor and

SET

RUN

DELAY

55%

PWM Controller

GND1

BLANKING

200ns

16V

–

16V

LT1509

LIM

GND2

GTDR2

GTDR1

1500 • BD01

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