-100 Volts (10mA) from +20V

[nandopg]

Hi fellows,

I am looking forward a voltage converter, preferentially an IC because of the little area I have, to converter +20VDC to -100VDC able to supply 10mA max. This is to reverse bias a series of PIN diodes in a high power RF switch circuit.

Anyone can give me a direction on this ?

Thank you and have all a great New Year,

NandoPG

 

[nandopg]

Hi Fellows,
I found the solution that proved to be very good for my application. I used a Ringing-Choque DC-DC Converter topology and everything came up nice and smooth.

I assembled a prototype and got my -100 Volts driving 40mA to an external load from +20 VDC power supply. Ripple was surprisingly good, 25mVpp using a 47uF/450V filter capacitor for an oscillation frequency of 6KHz. This means 72dB ripple attenuation !!

The reference I used for the design was the old book: RCA Designers Handbook for Solid State Power Circuits pg 301-314. There are typos on some expressions but pretty easy to track them down.

Happy New Year !!

NandoPG