Cellphone chargers typically sit plugged in and unused most of the time. Yet they still draw power from the grid, wasting energy and the consumer’s money. A problem facing design engineers is how to reduce standby power in these devices, thereby saving energy, meeting government regulations and saving the consumer money.
To help designers meet this challenge, Fairchild Semiconductor developed the FAN302HL PWM controller for low standby power charger applications. Incorporating mWSaver technology, the device features patented technologies that allow it to minimise standby input power consumption to <10 mW at 230 V a.c.
The device provides several features to enhance the performance of general flyback converters. Integrating a 500 V JFET, it can cut off the current path after the device is turned on, reducing start-up losses. The patented constant current control topology enables simplified circuit design without secondary constant current feedback circuitry – especially important in battery charger applications.
The FAN302HL also provides several protection features. These 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 clamped at 15 V to protect the power MOSFET from high gate-source voltage damage. The IC does not require an external secondary-side over-voltage protection (OVP) circuit. If either VS pin OVP or internal over-temperature protection is triggered, the device enters latch mode until AC power is removed, saving secondary-side OVP components and tightening VO protection (<6 V).
Primary side regulation control for constant current and no secondary-side current sensing provides lower losses and improved efficiency. Proprietary burst mode operation, with lower operation current, minimises standby power consumption. Additionally, the FAN302HL uses secondary-side regulation for constant voltage with good dynamic response, meeting USB 2.0 specifications.
In addition to cellphone chargers, the device is suitable for applications such as smart phones, cordless phones, DVD/set-top boxes, power over Ethernet and small appliances.
The role of bidirectional charging in the evolving energy landscape Avnet Silica
Power Electronics / Power Management
As reliance on renewable sources like wind and solar continues to grow, the need for efficient energy flow and storage solutions has become more critical than ever.
Read more...How to calculate a buck converter’s inductance
Power Electronics / Power Management
In the buck circuit, the inductor design is a key element that is closely related to system efficiency, the output voltage ripple, and loop stability.
Read more...High-current EMI filters Accutronics
Power Electronics / Power Management
TDK has introduced 20 and 40 A, 80 V DC board-mount EMI filters, reducing differential mode conducted emissions for switching power supplies with high input current requirements.
Read more...Isolated SMD DC-DC converters iCorp Technologies
Power Electronics / Power Management
MinMax has launched a series of isolated SMD DC-DC converters, the MSU01 series delivering 1 W, while the MSU02 series offers 2 W output.
Read more...Multi-config connector series Future Electronics
Interconnection
Hirose Electric’s DF11 Series is a versatile 2,0 mm pitch, double-row board-to-wire connector designed to simplify a wide range of connection needs.
Read more...Next-gen power meter Electrocomp Express
Power Electronics / Power Management
The VT-PWR-LV is a next-gen Vista Touch power meter from Trumeter for single, split, and three-phase systems.
Read more...Advanced PMIC for high-performance AI applications ASIC Design Services
Power Electronics / Power Management
Microchip Technology has announced the MCP16701, a Power Management Integrated Circuit (PMIC) designed to meet the needs of high-performance MPU and FPGA designers.
Read more...New SiC power MOSFET Future Electronics
Power Electronics / Power Management
STMicroelectronics’ SCT012H90G3AG is a robust, automotive-grade SiC MOSFET, engineered for demanding power electronics, featuring a 900?V drain-source voltage and exceptionally low on-resistance of 12?mO at 60?A.
Read more...Fundamental motor control design challenges and solutions
Power Electronics / Power Management
Mouser Electronics has announced a new eBook in collaboration with Qorvo, featuring industry experts providing key insights into methods, power efficiency and integration solutions available for motor control applications.
Read more...Satellite IoT through non-terrestrial networks Future Electronics
Editor's Choice Telecoms, Datacoms, Wireless, IoT
Non-terrestrial networks fill cellular coverage gaps in remote areas by extending terrestrial networks and are not subject to disruptions from natural disasters or sabotage.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version