ZHCS819G March 2012 – March 2018 DRV110
The DRV110 controls the current through the solenoid as shown in Figure 2. Activation starts when EN pin voltage is pulled high either by an external driver or internal pullup. In the beginning of activation, DRV110 allows the solenoid current to ramp up to the peak value IPEAK and it regulates it at the peak value for the time, tKEEP, before reducing it to IHOLD. The solenoid current is regulated at the hold value as long as the EN pin is kept high. The initial current ramp-up time depends on the inductance and resistance of the solenoid. Once EN pin is driven to GND, DRV110 allows the solenoid current to decay to zero.