UM612A
DESCRIPTION
The UTC UM612/A is a secondary-side CC/CV controller for SPS applications.
It integrates a Constant Current (CC) regulating amplifier, a Constant Voltage (CV) regulating amplifier, and 2 precision reference voltages.
An internal 2.5V reference voltage is generated from VCC input power. The UTC UM612/A can be used to monitor the transformer secondary-side output voltage by the CV control loop and regulate the output current by the CC control loop at the same time.
The transformer secondary-side output voltage can be monitored by the FB pin voltage. The sensed FB pin voltage is pared with the 2.5V internal reference. When the FB pin voltage is higher than 2.5V, the OUT pin will sink more current at the external opto-coupler and instruct the controller at primary-side to adjust the output voltage.
The output current can be regulated by the voltage across the CN and CP pins through the current sense resistor connected between the CN and CP pins. The voltage difference between...
