Half-bridge
Here’s a simple half-bridge driver based on the LM5106 half-bridge driver with charge pump and programmable dead time coupled with a FDS6986AS dual N mosfet . It’s pretty much the sample circuit in the datasheet with an added jumper to select the charge pump source. The current setup allows for driving loads at 30V up to 6.5A continuously while switching at high frequencies (50khz and up). By replacing the chosen dual mosfet with two discrete high power fets up to 100V loads and very high currents can be controlled. The current minimum switching frequency is around 1-2Hz (charge pump self-discharge).
Eagle library, schematic and board available here. Use 25V X5R or X7R capacitors, do not use Y5V/Z5U capacitors.
The second image shows a use for the half-bridge driver; driving a synchronous three-phase hard-disk motor. Commutation is done “blindly” with an adjustable delay between each commutation step. The output to each phase is a trapezoidal waveform. Speeds of up to 20,000 RPM are easily achieved. This design can easily be scaled up for larger motors.
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