FEATURES

• 10- to 120-V Input Range
• Current-Mode Control
• On-Chip 200-V, 5-W MOSFET Switch
• SHUTDOWN and RESET
• High Efficiency Operation (>80%)
• Internal Start-Up Circuit
• Internal Oscillator (1 MHz)

DESCRIPTION

The Si9104 high-voltage switchmode regulator is a monolithic
BiC/DMOS integrated circuit which contains most of the
components necessary to implement a high-efficiency dc-todc
converter up to 3 watts. It can either be operated from a
low-voltage dc supply, or directly from a 10- to 120-V
unregulated dc power source.
This device may be used with an appropriate transformer to
implement most single-ended isolated power converter
topologies (i.e., flyback and forward).
The Si9104 is available in a 16-pin wide-body SOIC and is
specified over the D suffix (-40 to 85°C) temperature range.