Switched Voltage Regulator IC’s Part 1

The Si9100 high-voltage switchmode regulator is monolithic BiC/DMOS integrated circuits which contain most of the components necessary to implement high-efficiency dc-to-dc converters up to 3 watts. They can either be operated from a low-voltage dc supply, or directly from a 10- to 70-V unregulated dc power source. The Si9100 may be used with an appropriate transformer to implement most single-ended isolated power converter topologies (i.e., flyback and forward), or by using a level shift circuit can generate a +5-V or a -5-V non-isolated output from a -48-V source.The Si9100 is available in both standard and lead (Pb)-free 14-pin plastic DIP and 20-pin PLCC packages which are specified to operate over the industrial temperature range of -40°C to 85°C.

• 10- to 70-V Input Range
• Current-Mode Control
• On-Chip 150-V, 5- MOSFET Switch
• Reference Selection Si9100 - ±1%
• High Efficiency Operation (> 80%)
• Internal Start-Up Circuit
• Internal Oscillator (1 MHz)
• SHUTDOWN and RESET