12

LT1249

©LINEAR TECHNOLOGY CORPORATION 1994

sn1249 1249fbs LT/TP 0799 2K REV B • PRINTED IN USA

–

+

–

+

7.5V

EA

1V

–

+

M1

–

+

200

32k

16V/10V

0.7V

–

+

OSC

SYNC

R

S

Q

6

5

3

4

2

1

8

MULTIPLIER

7

CA

RUN

RUN

GTDR

16V

35pF

20

µA

MAX

250

µA

1N5819

4.7nF

1M

0.047

µF

0.47

µF

330k

10k

44

µA

22

µA

15

µA

100pF

1nF

20k

4k

180

µF

90V

TO

270V

EMI

FILTER

+

–

4k

0.2

Ω

750

µH*

1M

MURH860

GND

†

1249 TA01

IRF840

6A

10

Ω

7.5V

**

1. COILTRONICS CTX02-12236 (TYPE 52 CORE)

AIR MOVEMENT NEEDED AT POWER LEVEL GREATER THAN 250W.

2. COILTRONICS CTX02-12295 (MAGNETICS Kool M

THIS SCHOTTKY DIODE IS TO CLAMP GTDR WHEN MOS SWITCH TURNS OFF.

PARASITIC INDUCTANCE AND GATE CAPACITANCE MAY TURN ON CHIP SUBSTRATE

DIODE AND CAUSE ERRATIC OPERATIONS IF GTDR IS NOT CLAMPED.

*

**

+

Kool M

µ is a registered trademark of Magnetics, Inc.

PART NUMBER

DESCRIPTION

COMMENTS

LT1103

Off-Line Switching Regulator

Universal Off-Line Inputs with Outputs to 100W

LT1248

Full Feature Average Current Mode Power Factor Controller

Provides All Features in 16-Lead Package

LT1508

Power Factor and PWM Controller

Simplified PFC Design

LT1509

Power Factor and PWM Controller

Complete Solution for Universal Off-Line Switching Power Supplies

RELATED PARTS

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417