DRV120_15 Datasheet, PDF (11/23 Pages) Texas Instruments – Power-Saving Current Controlled Solenoid Driver

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DRV120
SLVSBG3B – JUNE 2012 – REVISED JULY 2015
Table 1. Sample Application Values
VARIABLE
Peak current
Hold current
Keep time
VALUE
150 mA
50 mA
100 ms
R_PEAK and R_HOLD (if applicable) can be determined using Equation 2 and Equation 3. For the sample values,
R_PEAK is set to 111 kΩ and R_HOLD can be shorted to GND. TI recommends that a 0-Ω resistor is used for
prototyping in case changes to this value are desired.
Next, C_KEEP can be set based on Equation 1, 1.33 µF for the sample values. R_OSC can initially be shorted to
GND, but again a 0-Ω resistor is recommended for prototyping. Additionally, a filter on the SENSE line may be
added if it will be in a high-noise environment and is recommended for prototyping. Typical values for this are 1
kΩ and 100 pF.
Finally, a current recirculation diode must be chosen based on the current values defined in Table 1. The current
recirculation diode should be a fast recovery diode.
8.2.3 Application Curves
L_ind = 1 H
R_ind = 50 Ω
Figure 6. I_SOLENOID, EN, and V_IN vs Time
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