DRV110_15 Datasheet, PDF (11/24 Pages) Texas Instruments – Power-Saving Solenoid Controller

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8 Application and Implementation
DRV110
SLVSBA8B – MARCH 2012 – REVISED JULY 2015
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The DRV110 device is designed to operate a solenoid valve or relay. For detailed information on using the
DRV110 with 230 V AC solenoids, see Current Controlled Driver for 230V AC Solenoids Reference Design
(TIDU584). A typical DC input design will be outlined in Typical Application. Approximate resistor and capacitor
values for the peak current, hold current, sense, and keep time will be derived for a sample application.
8.2 Typical Application
V_S
R_S
V_S
C₁
V_EN
<STATUS>¹
VIN
L_S
D₁
DRV110
OUT
EN
R_OSC
OSC
1_{Available only in the 14-pin package}
Figure 5. Default Configuration
8.2.1 Design Requirements
The key elements to identify here are the system input voltage, peak current, hold current, and peak keep time
values required for the solenoid or relay being used. With these values, approximate R_S, R_PEAK, R_HOLD (for 14-pin
package), C_KEEP, and R_SENSE values can be determined and the proper FET and diode can be identified. R_OSC
can be varied in order to tune the circuit to the chosen solenoid or relay.
8.2.2 Detailed Design Procedure
First, the input voltage to the DRV110 must be considered. If this is from 6 V to 15 V, then no current-limit
resistor is required and only the input capacitor is necessary. If V_IN exceeds 15V, then R_S must be calculated
based on Equation 5 and included to prevent excess power loss and potential damage.
Next, with the known peak current, hold current, and peak keep time values, the R_PEAK, R_HOLD (for 14-pin
package), C_KEEP, and R_SENSE values can be determined. Calculation will proceed based on example values
shown in Table 1.
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