ON Semiconductor Distributor

NCP4354 SMPS Controllers


Secondary-side SMPS controllers from ON Semiconductor for applications which require extremely low no-load power consumption


ON Semiconductor's NCP4354 SMPS ControllersThe ON Semiconductor NCP4354 is a secondary side SMPS controller designed for use in applications that 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 decreases to an adjustable level. Once more energy is required, the NCP4354 automatically restarts the primary side controller.

During normal power supply operation, the devices provide integrated voltage feedback regulation, replacing the need for a shunt regulator. The A versions include a current regulation loop in addition to voltage regulation. Feedback control as well as ON/OFF signal can be provided with only one optocoupler.

The NCP4354 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. The NCP4354 is available in SOIC-8 package. Datasheet

Features
  • Constant current and constant voltage regulation (A version)
  • ±1% reference voltage accuracy over temperature
  • Low power consumption in all operating modes
  • Supply Current <100 μA
  • Optional current regulation
  • Accurate regulation

Digi-Key P/N Manufacturer P/N Packaging Description
NCP4354ADR2GOSTR-ND NCP4354ADR2G Tape & Reel IC PFC CTRLR SEC SIDE 6TSSOP
NCP4354ADR2GOSCT-ND Cut Tape
NCP4354ADR2GOSDKR-ND Digi-Reel®