LTC3862-1 8.5V-28V Input, 72V/ l.5A Output Low Emissions Diesel Fuel Injector Actuator Supply
Tomorrow’s low emissions diesel fuel injection systems require more precise and faster actuation of the fuel injectors than do their gasoline counterparts. Stepping up the voltage of the system is an easy way to achieve fast actuation by increasing di/dt in the actuator, since the energy stored on a capacitor is CV2/2. Boosting the car battery voltage from 13V to 72V significantly increases the di/dt, enabling faster actuation. The actuation of the injector typically discharges the supply capacitor by 10V–20V, after which the boost converter recharges the output cap to 72V. The figure above illustrates this 8.5V to 28V input, 72V/1.5A output 2-phase boost converter.
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