HV Nixie DC-DC Switching Power Supply
- Michail Papadimitriou
Nixie tubes need about ~180Vdc to light up and thus on most devices a DC-DC converter is needed. We designed here a simple DC-DC switching regulator capable of powering most of Nixie tubes.
The module is based on the MAX1771 Step-Up DC-DC Controller. This controller works up to 300kHz switching frequency and that allows the usage of miniature surface mount components. It accepts an input voltage from 12 to 16.5V and the output is factory configured to 12V. In this module the output voltage is configured higher at ~180Vdc using external resistors and a potentiometer.
The MAX1771 is driving an external N-channel MOSFET and with the help of the inductor and a fast diode, high voltage is produced.
MOSFET has to be low RDSon, Diode has to be fast Mttr, typically < 50nS and capacitors has to be low ESR to have good efficiency.
|R1||1.5 M – 0805 SMD||667-ERJ-6GEYJ155V|
|R2||10 k trimmer||652-3296W-1-103LF|
|R3||10 k – 0805 SMD||667-ERJ-P6WF1002V|
|C2||100nF – 0805 SMD||80-C0805C104K5R|
|C3||100nF – 0805 SMD||80-C0805C104K5R|
|C4||4.7uF / 250V||647-UPW2E4R7MPD|
|C5||100nF / 250V||667-ECW-U2104KC9|
|L1||100uH / 1.8A||871-B82479A1104M|