DRV110_15 Datasheet, PDF (12/24 Pages) Texas Instruments – Power-Saving Solenoid Controller

DRV110
SLVSBA8B – MARCH 2012 – REVISED JULY 2015
www.ti.com
Table 1. Sample Application Values
VARIABLE
Peak current
Hold current
Keep time
VALUE
150 mA
50 mA
100 ms
For I_PEAK, the V_REF range is 300 mV to 900 mV, so the I_PEAK range is defined by 300 mV / R_SENSE to 900 mV /
R_SENSE. For I_HOLD with the 8-pin package, I_HOLD is set by 50 mV / R_SENSE. For I_HOLD with the 14-pin package, the
V_REF range is 50 mV to 150 mV, so the I_HOLD range is defined by 50 mV / R_SENSE to 150 mV / R_SENSE. Based on
these ranges, a suitable R_SENSE must be chosen. For the sample values, R_SENSE of 1 Ω works for both the 8-pin
and 14-pin package. With R_SENSE chosen, 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 400 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 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 FET and 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
R_OSC = 0 Ω
R_SENSE = 1 Ω
R_ind = 50 Ω
R_PEAK = 303 kΩ
C_KEEP = 1 μF
Measured on the EVM
Figure 6. I_SOLENOID, EN, and V_IN vs Time
R_HOLD = 0 Ω
L_ind = 1 H
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