DC-DC converters provide adjustable outputs and extremely low output noise

TDK Corporation has introduced the TDK-Lambda 12V input CHVM series of high voltage non-isolated DC-DC converters. The series can provide nominal outputs of 180V to 2,000V, adjustable from 0.5% to 100%, with output power levels of 1.4W to 3W. The metallic shielded case diminishes radiated emissions and adds to a very low output ripple and noise. The converters are excellent for precision, noise-sensitive applications, such as photomultiplier tubes, photodiodes, X-ray fluorescence spectrometers, scanning electron microscopes, mass spectrometers and ultrasonic probes.

The series is offered with outputs of 180, 300, 350, 470, 1,000, 1,500 and 2,000V in either a positive or negative polarity. The output may be programmed utilising an external voltage or resistor over a 0.5 to 100% range and can be inhibited utilising the remote on/off function. All models are shielded against an over-current condition. The input voltage is 11V to 13V for the 1.4W and 1.5W models, 10.8V to 16.5V for the 2W and 10.8V to 13.2V for models 2.5W or higher.

Three compact case sizes cover the complete series. The CHVM1R5 (1.4W and 1.5W) measures 44mm x 16mm x 30mm (WxLxH), the CHVM2 and CHVM2R6 (2W and 2.6W) 110mm x 12mm x 19.75mm and the CHVM2R5, CHVM2R7 and CHVM3 (2.5W, 2.7W and 3W) 80mm x 12mm x 19.75mm.

The operating temperature range is -10C to +50C for the 1.5W models and -10C to +60C, derating linearly to 60% load above +50C, for the higher power models. The CHVM will start up at -20C. Safety certification incorporates IEC/UL/CSA/EN 62368-1 with CE marking to the Low Voltage and RoHS Directives.