We suggested TDK-Lambda’s SWS1000L-60 power supply, which has, as standard, a Programming Voltage (PV) Input. By applying from 1 to 5.5 volts to this input, the output of the power supply can be varied from 12 to 66V.
Alternatively, the Programming Voltage could have been derived from the SWS1000L’s 12V auxiliary output, which in this case could be connected to an external potentiometer to provide the variable dc input.
This simple solution saved the customer both design time and money. More information about the SWS1000L power supplies can be found at this web link http://www.us.tdk-lambda.com/lp/ftp/specs/sws600_1000l.pdf
The PV function is also available as on option on TDK-Lambda’s HWS series 300-600W models and is standard on the 1000-1500W models. More info can be found here http://www.us.tdk-lambda.com/lp/ftp/specs/hws1500.pdf