FEATURES

BiC/DMOS Technology

Current Mode Control

Max 50 Duty Cycle Operation

1.3-MHz Error Amp

Up to 500-kHz Internal Oscillator

Soft-Start

0.6-V Fast Over-Current Protection

<5- A Supply Current for +VIN <18 V

23.5-V to 200-V Input Voltage Range

Programmable Start/Stop Capability

Internal Start-Up Circuit

Power_Good Output

DESCRIPTION

Si9113 is a current mode PWM controller for ISDN power

supplies. In a 14-pin SOIC package, it provides all necessary

functions to implement a single-switch PWM with a minimum

of external parts. To maximize the circuit integration, the

Si9113 is designed with a 200-V depletion mode MOSFET

capable of powering directly off the high input bus without an

external start-up circuit. The Start and Stop input voltage

thresholds can be programmed within the operating input

voltage range by means of a resistor divider, provided +VIN

(Start) > +VIN (Stop). The internal clock frequency is set with

a single external resistor and is capable of capacitor-coupled

external synchronization. In order to satisfy the stringent

ambient temperature requirements, the Si9113 is rated to

handle the industrial range of −40 C to 85 C.

The Si9113 is available in both standard and lead (Pb)-free

packages.