Provides ultra-low standby power of 10mW or less, for portable device chargers
Fairchild PSR/SSR Hybrid PWM Controller Incorporating mWSaver™ Technology
Provides the highest level of power savings in power supplies

Generally, mobile phone chargers remain plugged in and unused for most of the time. However, they still draw power, wasting energy and money. The problem facing designers is clear: how can standby power be reduced in these devices to conserve energy, meet government regulations, and save money for customers?

To assist designers facing these challenges, Fairchild Semiconductor has developed the FAN302HL PWM controller for low standby power charger applications. Incorporating mWSaver™ technology, the FAN302HL features technology that minimizes standby input power consumption of less than 10mW @230VAC, exceeding the ENERGY STAR® program requirements for computer version 5.0 efficiency standards.

The highly integrated PWM controller offers several features to enhance the performance of standard flyback converters. The FAN302HL, with its built-in 500V JFET, can cut off the current path after the product is turned on, thereby reducing startup losses. The patented constant current control topology simplifies circuit design by eliminating the secondary constant current feedback circuit, which is particularly critical in battery chargers.

The FAN302HL also provides various protection features. This product includes cycle-to-cycle current limiting that guarantees a fixed peak current limit level even in short circuits. Additionally, the gate output is also fixed at 15V to protect the power MOSFET from high gate-source voltage damage.

FAN302HL does not require an external secondary overvoltage protection circuit. When the VS pin OVP or internal overtemperature protection is activated, this product enters Latch mode until the AC voltage is removed while protecting the secondary OVP component and strengthening Vo protection to 6V or less.

Innovative technology can significantly reduce losses in both power MOSFETs and PWM ICs. The absence of primary constant voltage control for constant current and secondary current sensing results in lower