Specifications subject to change without notice. 03/13

Demo Boards

High Voltage Flyback Charge Circuit

Available for 95069-1, 95072, 95073, 95074, 95075, 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

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