FEATURES

10- to 120-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

Reference Selection

Si9110 − 1%

Si9111 − 10%

DESCRIPTION

The Si9110/9111 are BiC/DMOS integrated circuits designed

for use as high-performance switchmode controllers. A

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

wide range of input voltages (10- to 120-VDC). Current-mode

PWM control circuitry is implemented in CMOS to reduce

internal power consumption to less than 10 mW.

A push-pull output driver provides high-speed switching for

MOSPOWER devices large enough to supply 50 W of output

power. When combined with an output MOSFET and

transformer, the Si9110/9111 can be used to implement

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

forward, and cuk).

The Si9110/9111 are 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.