| 摘要 |
A solenoid driver circuit includes an input terminal for receiving a solenoid actuation pulse, an output terminal for connection to a terminal of a solenoid coil, a pull-in current adjustment terminal, and a hold-in current duty cycle adjustment terminal. A pull-in current duration circuit includes a first input coupled to the input terminal, an output producing a pull-in current duration pulse, and a second input coupled to the pull-in current adjustment terminal. A hold-in current duty cycle control circuit includes a first input coupled to receive a triangular waveform signal, a second input coupled to the hold-in current duty cycle adjustment terminal, and a third input coupled to the output of the pull-in current duration circuit. An output transistor includes a control electrode coupled to an output terminal of the hold-in current duty cycle control circuit, and a current carrying terminal coupled to the output terminal. The hold-in current duty cycle control circuit applies a drive pulse to the control electrode of the output transistor for the duration of the pull-in current duration pulse, followed by a sequence of PWM hold-in current pulses respectively turning the output transistor on and off until the end of the solenoid actuation pulse.
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