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SI9114ADJ-SI9114ADY-SI9114ADY-T1-E3
High-Frequency Switchmode Controller
Si9114A
Vishay Siliconix
High-Frequency Switchmode ControllerFEATURES 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/dcconverters. Single-ended topologies (forward and flyback) can
be implemented at frequencies up to 1 MHz. The oscillator hasan internal divide-by-two that limits the duty ratio to 50%. An
oscillator sync output allows converters to be synchronized inphase 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 minimizesupply current requirements.
The high-voltage DMOS transistor allows the IC to interface
directly to bus voltages up to 200 V. Other features include a1.5% accurate voltage reference, 1.8-MHz (min) bandwidth
error amplifier, shutdown logic control, soft-start andundervoltage lockout circuits.
The Si9114A is available in both standard and lead (Pb)-free
14-pin plastic DIP and SOIC packages, and is specified overthe industrial, D suffix (−40�C to 85�C) temperature range. COMPENSATION
VCC
+VIN
ROSC COSC
VREF
CURRENTSENSE
SHUTDOWN
−VIN
SYNC
DRIVEROUTPUT
