DC1924A

Evaluation Board, Lt8705 DC-DC Converter

The demonstration board is a high performance buck boost converter featuring LT8705EUHF DC to DC controller. The LT8705EUHF is a high performance buck boost switching regulator controller. It has integrated input current, input voltage, output current and output voltage feedback loops. The demonstration board input range is 36V to 80V. The output is optimized for 48V, 5A. Additional input bulk capacitance may be needed, subject to the source impedance. The CLKOUT output and the SYNC input can be used to synchronize switching between two or more DC1924A circuits. The input range of the demo circuit is up to 80V, therefore, the demo circuit utilizes 100V MOSFETs. The typical efficiency is about 97% from a 36V input to 48V, 5A load, using the stock inductor. At the output power level of 100W, even one percent of efficiency improvement is a big advantage in minimizing temperature rise. Modifications can be made to DC1924A in order to increase the efficiency even higher.

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Switching frequency of 200KHz

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Single inductor allows VIN above, below or equal to regulated VOUT

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Quad N channel MOSFET gate drivers

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Synchronous rectification

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Input and output current monitor pins

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Integrated input current, input voltage, output current and output voltage feedback loops

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Clock output usable to monitor die temperature