PWM Controller Provides Low Standby Power Under 10 mW for Portable Device Chargers
Mon, 03/07/2011 - 7:42am
Fairchild Semiconductor’s FAN302HL PWM controller for low standby power charger applications incorporates the company’s mWSaver technology to minimize standby input power consumption to <10 mW at 230 VAC to meet ENERGY STAR Program Requirements for Computers Version 5.0 efficiency standards. This integrated PWM controller integrates a 500V JFET, and it allows the device to cut off the current path after the device is turned on, reducing start-up losses. Its constant current control topology enables simplified circuit design without secondary constant current feedback circuitry. Protection features include cycle-to-cycle current limiting to ensure a fixed peak current limit level, even if a short circuit occurs. Additionally, the gate output is also clamped at 15V to protect the power MOSFET from high gate-source voltage damages. In addition to cell phone chargers, the FAN302HL is suitable for smart phones, cordless phones, DVD/set-top boxes, Power Over Ethernet and small appliances.