DRV120_15 Datasheet, PDF (10/23 Pages) Texas Instruments – Power-Saving Current Controlled Solenoid Driver

DRV120
SLVSBG3B – JUNE 2012 – REVISED JULY 2015
8 Application and Implementation
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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 DRV120 device is designed to operate a solenoid valve or relay. A typical DC input design will be outlined in
Typical Application. Approximate resistor and capacitor values for the peak current, hold current, and keep time
will be derived for a sample application.
8.2 Typical Application
V_S
V_S
V_EN
R_OSC
VIN
EN
OSC
<STATUS>¹
DRV120
L_S
D₁
OUT
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), and C_KEEP 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, with the known peak current, hold current, and peak keep time values known, the R_PEAK, R_HOLD (for 14-pin
package), and C_KEEP values can be determined. Calculation will proceed based on example values shown in
Table 1.
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