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Flyback controller charges any size capacitor

Milpitas, Calif.—Linear Technology Corp.'s flyback controller rapidly charges large capacitors to voltages as high as 1000V.

The LT3751 drives an external N-Channel MOSFET and can charge a 1000uF capacitor to 500V in less than 1 second. Applications include professional photoflash systems, RF security, inventory control systems and specialized high voltage power supplies.

The LT3751 can be configured for primary-side output voltage sensing without needing an optocoupler. For lower noise and tighter regulation applications, a resistor divider network from output voltage can be used to regulate the output, making it well suited for high voltage power supply requirements.

Boundary mode control minimizes transition losses and delivers up to 88% efficiency. The VCC input voltage ranges from 5V to 24V, enabling it to operate from a variety of power sources and the VTRANS supply voltage range is dependent upon the choice of external components with the LT3751's internal shunt regulator. A low 106mV differential current sense threshold accurately limits peak switch current.

The LT3751 is packaged in a thermally enhanced 4mm x 5mm QFN-20 package, and is offered in extended and industrial temperature ranges from -40°C to 125°C.

Pricing: Starts at $3.65 each in 1,000-piece quantities.
Availability: Now.
Datasheet: Click here.

Linear Technology, www.linear.com

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