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Efficient switching controller

2015-03-01 20:57  
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Switching controllers utilize external power MOSFETs to offer design engineers the flexibility to set output current levels and limits, that typically range from 5 A to 25 A per channel for synchronous designs. This high-performance switching controller for a low-power  servo motor uses a symmetrical complementary- transistor bridge. The bridge acts as a reversing switch between the motor and a single-ended power supply. Since the transistors operate either fully on or completely off, except during a very short transition period, much less heat is dissipated than in linear-amplifier circuits. Damping is provided by the circuit`s inherent dynamic braking.Since either maximum or zero voltage is applied to themotor, the dynamic response is faster than that of linear servo drives.TheLT3742is a dual step-down DC/DC switching regulator controller that drives high side N-channel power MOSFETs.
 

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