ZHCSLD2E may 2020 – july 2023 UCC28782
PRODUCTION DATA
The 2.2-V UVLO(ON) threshold, 1-V UVLO(OFF) threshold, and the 30-V Max. voltage rating on the BIN pin allows the switching bias regulator to generate a usable bias power for a wide output voltage range application. The 15-V boost mode disable threshold allows the rectified auxiliary winding voltage to supply the bias power directly without the boost conversion loss. For example, when a 3.3-V to 21-V output voltage range is needed, the turns ratio between the auxiliary winding and the secondary winding should be set to one. The boost mode operation will regulate VVDD at 18.5 V for the 3.3-V to 14.9-V output range. The boost operation is disabled in the 15-V to 21-V output voltage range, VVDD follows the output voltage change with a boost diode drop.