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

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Mobile phone chargers are usually plugged into the outlet and are not performing charging most of the time. However, they still consume power, thus wasting energy and user money. How to reduce the standby power consumption of these devices, thereby saving power, meeting government regulations, and saving money for users, is clearly a problem that design engineers must face.

To help designers address this challenge, a global leader in high-performance power and mobile products supplier Fairchild Semiconductor (Fairchild Semiconductor) enables the development of ultra-low standby power charger applications FAN302HL PWM controller, the device uses mWSaver ™ Technology and integrated patented technology to minimize standby input power consumption, <10mW at 230VAC, exceeding the five-star requirements of the ENERGY STAR® computer specification.



The FAN302HL highly integrated PWM controller features several features that enhance the performance of a general-purpose flyback converter, such as the integrated 500V JFET, which cuts off the current path and reduces startup losses when the device is turned on. Its patented constant current control topology simplifies circuit design and eliminates the need for a secondary-side constant current feedback circuit, providing important advantages for battery charger applications.

The FAN302HL also features several protection features, including cycle-by-cycle current limiting, to ensure a fixed peak current limit level, even in the event of a short circuit. In addition, the device clamps the gate output voltage to a 15V level to protect the power MOSFET from damage caused by excessive gate-to-source voltage.

The FAN302HL does not require an external secondary overvoltage protection (OVP) circuit. If either the OVP function of the VS pin or the internal overtemperature protection function is triggered, the device will enter the lock mode until the AC power is turned off, thus saving Remove the secondary side OVP component while enhancing VO protection (<6V).

Innovative technology reduces the amount of losses in power MOSFETs and PWM ICs, such as constant current using primary-side regulation control, eliminating the need for secondary-side current sensing, reducing power consumption and increasing efficiency. The FAN302HL has a proprietary intermittent mode operation with low operating current to minimize standby power consumption.

In addition, the FAN302HL uses secondary side regulation for constant voltage control with excellent dynamic response to meet the requirements of the USB 2.0 specification. Compared to traditional designs or linear transformers, the FAN302HL is used to design the charger, which reduces external components and minimizes costs.

In addition to mobile phone chargers, the FAN302HL is also suitable for applications such as smartphones, wireless phones, DVD/set-top boxes, Power Over Ethernet and small appliances.

The FAN302HL is available in an 8-pin small package with a fixed PWM frequency of 85kHz and a frequency-jittering feature to reduce EMI.

Fairchild design engineers to push through such a design innovation as solution development FAN302HL, the device is a Fairchild mWSaver using similar technology to provide optimum power saving characteristic and minimize the number of elements one of a range of products.

Fairchild Semiconductor: Excellence in technology to help you succeed!

Price (order 1,000):
The FAN302HL is priced at $0.50

Availability: Samples are available now

Delivery time: 8 to 10 weeks after receiving the order