A solenoid driver has been designed using the DRV110 APWR. It is designed to handle a pick current of 10A and a hold current of 0.6A. It is oscillating at 20 kHz and offers a 1s keep time for the pick current. The original schematic can be seen below.
A few edits were made to the original schematic in order to attempt to achieve the appropriate PWM signal. The edits can be seen in the schematic below. A 1k resistor replaced the 3k resistor, an additional 1k resistor was added to the SENSE pin to act as a filter and the 4.45k resistor was removed because it is not necessary at the operating ranges.
It operates at 12V and is exposed to outdoor temperatures. The oscilloscope of the edited circuit can be seen below. It is being few with a 12V battery at room temperature. The measurement is taken on the output side of the driver and it appears that the PWM signal is not turning on fully all of the time.
The BOM can be seen below in case it is needed.
Identifier: | Manufacturer: | Manufacturer Part #: | Description: |
R1 | Yageo | RC0603FR-07200KL | 200k Resistor 1% [R0603] |
R2 | Panasonic |
| 162k Resistor 1% [R0603] |
R3 | Yageo | RC0603FR-0710KL | 10k Resistor 1% 1/10W [R0603] |
R4 | Yageo | RC0603FR-0720KL | 20k Resistor 1% 1/10W [R0603] |
R5 | Yageo |
| 4.42k Resistor 1% [R0603] |
R6 | Yageo | RC0603FR-0766K5L | 66.5k Resistor 1% 1/10W [R0603] |
R7 | Yageo | RC0603FR-073KL | 3k Resistor 1% 1/10W [R0603] |
R8 | Yageo | RC0603FR-0710KL | 10k Resistor 1% 1/10W [R0603] |
R9 | Vishay Dale | WSR2R0900FEA | 0.09 Ohm Resistor 1% 2W (5*2W for 5s) [R4527] |
C1 | Murata Electronics | GRM319R61E106KA12D | CER 10uF 25V Rated [C1206] |
C2 | Murata Electronics | GRM219R60J106KE19D | CER 10uF 6.3V Rated [C0805] |
C3 | Murata Electronics | GRM21BR61E475KA12L | CER 4.7uF 25V Rated [C0805] |
C4 | Kemet | C0805C101J5GACTU | CER 100pF 50V Rated [C0805] |
C5 | Panasonic | EEE-FPV101XAP | CAP 100uF 35V Rated |
D1 | ON Semi | MM3Z12VT1G | DIODE ZENER 12V 300MW [SOD323] |
D2 | Fairchild Semi | 1N4148WS | DIODE GEN PURP 75V 150MA [SOD323] |
D3 | ON Semi | MM3Z5V6ST1G | DIODE ZENER 5.6V 200MW [S0D323] |
D4 | Micro-Commercial-Co | SK106-TP | DIODE SCHOTTKY 60V 10A [D0214AB] |
Q1 | Infineon | IRFZ44NSTRLPBF | N-CH MOSFET 55V |
U1 | Texas Instruments | DRV110APWR | DRV110APWR - IC CNTRLR PWM |