SG3525 DC Converter 12V to +35V,-35V
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SG3525 DC/DC Converter 12V to +35V,-35V Switchmode Power Supply For Car Audio
The selected switching topology is called a “push-pull” converter, because the transformer has a double primary (or a “centre-tapped” one, if your prefer). The centre tap is permanently connected to the car battery (via an LC filter to avoid creating peaks in the battery lines, which could affect other electronic equipment in the car). The two ends of the primary are connected to a pair of paralleled MOSFETs each that tie them to ground in each conduction cycle (Vgs of the corresponding MOSFET high).
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These MOSFETs should be fast, able to withstand high currents (in excess of 30A each if possible) and have the lowest possible Rds(on). …
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