Vishay Siliconix

Si9102

Document Number: 70001

S-70497-Rev. H, 19-Mar-07

www.vishay.com

1

3-W High-Voltage Switchmode Regulator

FEATURES

•

10 to 120 V Input Range

•

Current-Mode Control

•

On-chip 200 V, 7

Ω MOSFET Switch

•

SHUTDOWN and RESET

•

High Efficiency Operation (> 80 %)

•

Internal Start-Up Circuit

•

Internal Oscillator (1 MHz)

DESCRIPTION

The Si9102 high-voltage switchmode regulator is a mono-

lithic BiC/DMOS integrated circuit which contains most of the

components necessary to implement a high-efficiency dc-to-

dc converter up to 3 watts. It can either be operated from

a low-voltage dc supply, or directly from a 10 to 120 V un-

regulated dc power source.

This device may be used with an appropriate transformer to

implement most single-ended isolated power converter

topologies (i.e., flyback and forward).

The Si9102 is available in both standard and lead (Pb)-free

14-pin plastic DIP and 20-pin PLCC packages which are

specified to operate over the industrial temperature range of

- 40 °C to 85 °C.

FUNCTIONAL BLOCK DIAGRAM

+

-

-

+

+

-

+

-

+

-

FB

COMP

DISCHARGE

OSC

14 (20)

13 (18)

9 (12)

8 (11)

7 (10)

2 V

Ref

Gen

R

S

Q

R

S

Q

DRAIN

SOURCE

3 (5)

5 (8)

4 (7)

11 (16)

12 (17)

Current-Mode

Comparator

C/L

1.2 V

Undervoltage

RESET

8.8 V

9.4 V

BIAS

Current

Sources

To

Internal

Circuits

10 (14)

1 (2)

6 (9)

2 (3)

Comparator

Error

Amplifier

SHUTDOWN

4 V (1 %)

OSC

OUT

OSC

IN

(BODY)

Comparator

Note: Figures in parenthesis represent pin numbers for 20-pin package.