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SI9120DJ-SI9120DY-SI9120DY-T1-SI9120DY-T1-E3
Universal Input Switchmode Controller
Si9120
Vishay Siliconix
Universal Input Switchmode ControllerFEATURES 10- to 450-V Input Range Current-Mode Control 125-mA Output Drive Internal Start-Up Circuit Internal Oscillator (1 MHz) SHUTDOWN and RESET
DESCRIPTION
The Si9120 is a BiC/DMOS integrated circuit designed for use
in low-power, high-efficiency off-line power supplies.High-voltage DMOS inputs allow the controller to work over awide range of input voltages (10- to 450-VDC). Current-mode
PWM control circuitry is implemented in CMOS to reducequiescent current to less than 1.5 mA.
A CMOS output driver provides high-speed switching forMOSFET devices with gate charge, Qg, up to 25 nC, enough
to supply 30 W of output power at 100 kHz. These devices,
when combined with an output MOSFET and transformer, canbe used to implement single-ended power convertertopologies (i.e., flyback and forward).
The Si9120 is available in both standard and lead (Pb)-free16-pin plastic DIP and SOIC packages which are specified to
operate over the industrial temperature range of −40 �C to85 �C. COMP DISCHARGE
SENSE
RESET
8.6 V
BIAS ToInternal
ErrorAmplifier
VREF
VCC
+VIN
OSCOUTOSCIN
Pre-Regulator/Start-Up
−VIN
OUTPUTVCC
