Demo Boards
High Voltage Flyback Charge Circuit
Available for 95069-1, 95072, 95073, 95074, 95075, 95080
Features
Stand alone or external control
Easy change out of transformer
Sockets for snubber cap and Vadj resistor
Test points for each transformer terminal
Sockets for ICs
Current sense loop
Ordering Information
R1015 for D47s, D50s, 95069/73
R1016 for D48s, D58s, 95072/74/75
R1018 for D66s, 95080
NASCENTechnology, Inc. has developed a series of high voltage flyback charge circuit demonstration
boards that allow easy testing of LTCC high voltage flyback transformers. The boards can be operated
from an external pulse generator in an unregulated mode or use the provided MAX1771 controller in a
standard current mode control discontinuous flyback configuration for regulated output. The Vadj resistor
allows setting the output voltage in regulated mode. The input voltage range of 12 to 40 VDC can be
lowered by bypassing the internal regulator and supplying a 10 VDC aux voltage for the ICs. It can be
increased by increasing the voltage rating of the input capacitors. Similarly the output capacitor, rated at
1200 VDC can be easily swapped out for higher values. The peak current limit is set to 2A which can also
be adjusted by changing the sense resistor. The De-sta-co clamp allows mounting and changing
transformers without soldering. By removing J3 the secondary can be made floating, however feedback
for regulation is disabled (an external opto-isolator circuit could be substituted). Sockets are also provided
for quick adjustment of the MOSFET snubber capacitor. A current loop is provided for monitoring peak
input current. The board comes with a 100 nF capacitor and 200 Mohms sense/discharge resistor.
For additional information, contact: Daryl Schofield
Phone: 605-882-8513, Fax: 605-884-2450, E-Mail: dschofield@nascentechnology.com
NASCENTechnology, Inc. 121 Airport Drive, Watertown, SD 57201
www.nascentechnology.com
Specifications subject to change without notice. 03/13
DSP and ARM Processors
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