Fairchild's PWM controller realizes ultra-low standby power consumption of charger

Mobile phone chargers are often left plugged in, even when not in use. This leads to unnecessary energy consumption, which not only increases electricity bills but also contributes to environmental waste. For design engineers, reducing this standby power is a critical challenge—both for meeting regulatory standards and helping users save money.

To address this issue, Fairchild Semiconductor, a global leader in high-performance power and mobile products, has introduced the FAN302HL PWM controller. This innovative device leverages mWSaver™ technology and integrated patented features to drastically reduce standby power consumption, achieving less than 10mW at 230VAC—far exceeding the five-star requirements of ENERGY STAR® computer specifications.

The FAN302HL is a highly integrated PWM controller that enhances the performance of general-purpose flyback converters. It includes an integrated 500V JFET, which minimizes startup losses by cutting off the current path during turn-on. Its patented constant current control topology simplifies circuit design and eliminates the need for secondary-side feedback, making it ideal for battery charger applications.

Additionally, the FAN302HL offers advanced protection features such as cycle-by-cycle current limiting, ensuring a fixed peak current limit even under short-circuit conditions. The device also clamps the gate output voltage to 15V, protecting the power MOSFET from overvoltage damage.

The FAN302HL does not require an external secondary overvoltage protection (OVP) circuit. If either the VS pin’s OVP function or the internal overtemperature protection is triggered, the device enters a lock mode until the AC power is removed. This reduces the need for secondary-side components while improving VO protection (<6V).

Innovative technologies like primary-side regulation eliminate the need for secondary-side current sensing, reducing power loss and increasing efficiency. The FAN302HL uses a proprietary intermittent mode with low operating current to further minimize standby power consumption.

The device also supports secondary-side regulation for constant voltage control, offering excellent dynamic response to meet USB 2.0 specifications. Compared to traditional designs or linear transformers, using the FAN302HL in charger design reduces external components and lowers overall costs.

Beyond mobile phone chargers, the FAN302HL is suitable for a wide range of applications, including smartphones, wireless phones, DVD players, set-top boxes, Power Over Ethernet, and small appliances.

The FAN302HL comes in an 8-pin small package, with a fixed PWM frequency of 85kHz and a frequency-jittering feature to reduce EMI. Designed by Fairchild Semiconductor engineers, the FAN302HL is part of the mWSaverâ„¢ product family, offering optimal power savings and minimal component count.

Fairchild Semiconductor: Excellence in technology to help you succeed!

Price (order 1,000): $0.50

Availability: Samples available now

Delivery time: 8 to 10 weeks after order confirmation