FEATURES

9- to 80-V Input Range

Current-Mode Control

High-Speed, Source-Sink Output Drive

High Efficiency Operation (> 80)

Internal Start-Up Circuit

Internal Oscillator (1 MHz)

SHUTDOWN and RESET

DESCRIPTION

The Si9112 is a BiC/DMOS integrated circuit designed for use

in high-efficiency switchmode power converters. A

high-voltage DMOS input allows this controller to work over a

wide range of input voltages (9- to 80-VDC). Current-mode

PWM control circuitry is implemented in CMOS to reduce

internal power consumption to less than 10 mW.

A CMOS output driver provides high-speed switching of

MOSPOWER devices large enough to supply 50 W of output

power. When combined with an output MOSFET and

transformer, the Si9112 can be used to implement

single-ended power converter topologies (i.e., flyback,

forward, and cuk).

The Si9112 is available in both standard and lead (Pb)-free

14-pin plastic DIP and SOIC packages which are specified to

operate over the industrial temperature range of −40 C to

85 C.