DC2285A

DC2285A demonstration circuit features two high power high performance buck-boost LT®8705A converters operating in host-server configuration. The circuit can operate with input voltages above, below or equal to the output voltage. The demo board input range is 36V to 75V. The output is optimized for 48V at 18A, with the output current limit set at 20A. The circuit will operate with lower input voltage than 36V if load current is reduced. The LT8705A controller has integrated input current, input voltage, output current and output voltage regulators. The one regulator that wants to decrease current gets control over the compensation pin VC. The inductor current is controlled by the VC signal that is fed into a current comparator together with a ramp compensation signal. While the current mode control limits the inductor both in normal and in reverse direction, these current limits have some variation as input voltage changes.

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