State-of-the-art primary side switch for AC/DC converters
22 February 2006
Power Electronics / Power Management
F. Salanitri, VIPower product marketing, STMicroelectronics
The new VIPer53E from STMicroelectronics includes a PWM driver, an MDmesh MOSFET, a start-up high-voltage current source and several on-chip protection circuits.
The VIPer53E is an alternative choice to ST's VIPer53 when only the secondary regulation is required in a power supply. Like the standard VIPer53, the new version is housed in surface mounting DIP-8 and PowerSO-10 packages.
The higher VDD voltage range brings flexibility in designing the transformer. In fact in secondary regulation VIPer53E VDD voltage extends from 9 V to 18 V, while in the VIPer53 it goes from 9 V to 14,5 V and this wide voltage range can follow fast load variations. The extended VDD is implemented by eliminating an internal error amplifier.
Why use it?
Thanks to the MDmesh MOSFET with a breakdown voltage of 620 V, an RDS(on) of 1 Ω at 25°C and a typical handling output power of 40 W for a 85 to 265 V a.c. voltage mains is possible. For this level of power, the device does not require a heatsink.
The total power consumption of the converter is less than 0,5 W for the system when working in stand-by mode. This means power supply designers can easily meet the Blue Angel Eco or Energy Star Program.
Key features include: automatic burst mode for very low consumption in stand-by conditions (less than 500 mW); integrated high voltage start-up current source; overload and short-circuit control; over-voltage protection at 18 V; over-temperature shutdown; under-voltage protection; current mode control with adjustable drain current limitation; externally-set switching frequency, up to 300 kHz.
Applications
Although the main application of VIPer53E is in AC/DC converters for consumer equipment such as set-top boxes, DVDs, VCRs, it can also be used for stand-by power supplies for servers or in home appliances where a very efficient AC/DC power supply in buck topology is needed.
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