onsemi Power Supply for ARX3A0

The ON Semiconductor NCP1239B65WGEVB is a 65 W, 19V, fixed-frequency current-mode controller evaluation board featuring the Dynamic Self-Supply. This function greatly simplifies the design of the auxiliary supply and the Vcc capacitor by activating the internal start-up current source to supply the controller during start-up, transients, latch, stand-by etc. With a supply range up to 35 V, the controller hosts a jittered 65 or 100-kHz switching circuitry operated in peak current mode control. When the power on the secondary side starts to decrease, the controller automatically folds back its switching frequency down to minimum level of 26 kHz.

Supply voltage 19V