FEATURES

15- to 200-V Input Range

Current-Mode Control

Internal Start-Up Circuit

Latched SHUTDOWN

Soft-Start

1.8-MHz Error Amp

DESCRIPTION

The Si9114A is a BiC/DMOS current-mode pulse width

modulation (PWM) controller IC for high-frequency dc/dc

converters. Single-ended topologies (forward and flyback) can

be implemented at frequencies up to 1 MHz. The oscillator has

an internal divide-by-two that limits the duty ratio to 50. An

oscillator sync output allows converters to be synchronized in

phase as well as in frequency, in a master/slave configuration.

The output inverter can typically source 500 mA and sink

700 mA. Shoot-through current is all but eliminated to minimize

supply current requirements.

The high-voltage DMOS transistor allows the IC to interface

directly to bus voltages up to 200 V. Other features include a

1.5 accurate voltage reference, 1.8-MHz (min) bandwidth

error amplifier, shutdown logic control, soft-start and

undervoltage lockout circuits.

The Si9114A is available in both standard and lead (Pb)-free

14-pin plastic DIP and SOIC packages, and is specified over

the industrial, D suffix (−40 C to 85 C) temperature range.