Voice coil motor pulse width modulation-to-linear smooth transition control
Abstract:
Methods and apparatus providing a smooth transition from a pulse width modulation mode to a linear mode to drive a voice coil motor are disclosed. An example apparatus includes an H-bridge; a pulse generator to generate a pulse when the voice coil motor driver transitions from pulse width modulation mode to linear mode; a first boost circuit to, when the pulse is generated, increase a first current being applied to a first gate of a first transistor in the H-bridge, the increase in the first current enabling the first transistor; and a second boost circuit to, when the pulse is generated, provide an additional path to ground from a node coupled to a second gate of a second transistor of the H bridge, the path to ground corresponding to a voltage drop that disables the second transistor.
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