DC1739A-B

LINEAR TECHNOLOGY DC1739A-B Demonstration Board, 150W High Efficiency Active Clamp Forward Converter

The demonstration board is a 150W isolated forward converter with synchronous rectification featuring LTC3765EMSE/LTC3766EGN devices. The LTC3765EMSE is a start up controller and gate driver for use in a self starting secondary side control forward converter. When combined with the LTC3766 secondary side synchronous forward controller, a complete isolated power supply is created using a minimum of discrete parts. The LLTC3766EGN is a PolyPhase capable secondary side controller for synchronous forward converters. When used in conjunction with the LTC3765 active clamp forward controller and gate driver, the part creates a complete isolated power supply that combines the power of multiphase operation with the speed of secondary side control. Secondary side control eliminates complex optocoupler feedback, providing fast transient response with minimum output capacitance. The proprietary direct flux limit scheme guarantees no transformer saturation.

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Input supply range from 18V to 72V

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12V output voltage

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Continuous output current range from 0A to 11A

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Peak output current of 12.5A

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Switching clock frequency of 240KHz

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Output ripple of 60mVpp

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Output regulation of ±0.08%

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93.6% efficiency

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Isolation of 1500Vdc

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2.3inch × 0.9inch × 0.47inch approximate size

If there is no output, temporarily disconnect the load to make sure that the load is not set too high.