11

LT1248

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

300W, 382V Preregulator

Kool M

µ is a registered trademark of Magnetics, Inc.

–

+

–

+

200

7.5V

7.9V

12

µA

5V

EA

–

+

–

+

–

+

2.2V

32k

7

µA

7.5V

–

+

16V TO 10V

2.6V/2.2V

–

+

0.7V

OSC

R

R

S

Q

6

11

10

7

9

5

4

2

1

15

16

12

14

SS

OVP

EN/SYNC

3

RUN

CA

RUN

16V

GND

–

+

GTDR

1000pF

SYNC

1N5819

†

4.7nF

1M

20k

0.47

µF

0.047

µF

330k

0.1

µF

1nF

8

0.01

µF

13

100pF

20k

1%

4k

180

µF

T

90V

TO

270V

EMI

FILTER

+

–

4k

20k

0.2

Ω

50k

750

µH*

1M

1%

MURH860

56

µF

35V

10

Ω

15k

–

+

1248 TA01

IRF840

ONE SHOT

200ns

6A

M1

1. COILTRONICS CTX02-12236-1 (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.

*

**

†

+

+

APPLICATI

TYPICAL