Keywords: proportional-control solenoids, LED drivers, solenoid drivers, digital potentiometers, pulse-width modulation, PWM
where R5 = 56.2kΩ and N is the Nth wiper step (0 ≤ N ≤ 32). R3, R4, and C2 debounce the SW3 pulses that increment/decrement the wiper. Again, pressing SW1 enables wiper changes, and pressing SW2 (or not) controls the wiper's direction. U2 switches the solenoid at 200Hz, with a variable PWM duty cycle whose value depends on voltage at the DIM pin.
VDIM ≈ 5V((N - 1)3225.8Ω)/((N - 1)3225.8Ω + R5) (Eq. 1)
|VIN (VRMS)||Solenoid travel (inches)||DIM pin voltage (VDC)||Solenoid pull-in current (mARMS)||Duty cycle (%)||Solenoid pull-out current (mARMS)|
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APPLICATION NOTE 4503,AN4503, AN 4503, APP4503, Appnote4503, Appnote 4503
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