Posted on Jun 18, 2012

A MAX634 inverting regulator is combined with a MAX630 to provide a dual tracking ±15 output from a 12-V battery. The reference for the -15 V output is derived from the positive output via R3 and R4.

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Both regulators are set to maximize output power at low battery voltages by reducing the oscillator frequency, via LBR, when "BATT falls to 8.5 V.

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