ON Semiconductor NCP4355 Secondary Side
SMPS OFF Mode Controller
ON Semiconductor's NCP4355 Secondary Side SMPS OFF Mode Controller is a secondary side SMPS controller designed for use in applications which require extremely low no load power consumption. The device is capable of detecting "no load" conditions and entering the power supply into a low consumption OFF mode. During OFF mode, the primary side controller is turned off and energy is provided by the output capacitors thus eliminating the power consumption required to maintain regulation.
During OFF mode, the output voltage relaxes and is allowed to decrease to an adjustable level. Once more energy is required, the NCP4355 automatically restarts the primary side controller by ONOFF current that flows through ONOFF optocoupler. The NCP4355 controls the primary controller with an "Active ON" signal, meaning that it only drives optocoupler current during ON mode to minimize consumption during OFF mode. During normal power supply operation, the NCP4355 provides integrated voltage feedback regulation, replacing the need for a shunt regulator. The NCP4355 includes a LED driver pin implemented with an open drain MOSFET driven by a 1 kHz square wave with a 12.5% duty cycle for indication purpose.