DRV110_15 Datasheet, PDF (10/24 Pages) Texas Instruments – Power-Saving Solenoid Controller

DRV110
SLVSBA8B – MARCH 2012 – REVISED JULY 2015
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Feature Description (continued)
Voltage at the OUT pin, that is the gate voltage of an external switching device, is equal to VIN voltage during
ON-cycle. The voltage is driven to ground during OFF-cycle. VIN voltages below 15 V can be supplied directly
from an external voltage source. Supply voltages of at least 6 V are supported.
The DRV110 is able to regulate VIN voltage to 15 V from a higher external supply voltage, V_S, by an internal
bypass regulator that replicates the function of an ideal Zener diode. This requires that the supply current is
sufficiently limited by an external resistor between V_S and the VIN pin. An external capacitor connected to the
VIN pin is used to store enough energy to charge the external switch gate capacitance at the OUT pin. Current
limiting resistor size to keep quiescent current less than 1 mA can be calculated by Equation 5.
R_S
=
V_S,maxDC - 15V
1mA + I_Gate,AVE
(5)
Open-drain pulldown path at the STATUS pin is deactivated if either undervoltage lockout or thermal shutdown
blocks have triggered.
7.4 Device Functional Modes
The DRV110 transitions through three different states. The first is the OFF state, where the EN pin is low and the
PWM output is off. The second is the PEAK state, which begins when the EN pin is set high, and ends once
t_KEEPhas been reached. During this state, the PWM operates in order to reach the I_PEAK set by the R_PEAK. Finally,
once t_KEEP has been reached, the PWM continues to operate, but at the I_HOLD level. This continues until the EN
pin is set low again and the PWM turns off.
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