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DRV110EVM: Help activating and controlling solenoid
Part Number: DRV110EVM
I am using a DRV110EVM evaluation board to energize a 12V (29 ohm) solenoid.I am trying to use the on-board oscillator and peak/hold to cycle my solenoid, but I cannot get it to consistently actuate.If I adjust pots, I can trigger a single pickup and release but no continuous cycling.
- JP1, JP2, JP6 closed (with shorting shunts),
- JP3, JP4, JP5, JP8, JP7, JP9 open
- Pot R4 Peak, R5 Hold, and R6 (OSC) varied without cycling my solenoid
- 12 VDC supply connected to P1-1 and P1-3
- 12V (29 ohm) solenoid coil connected to P1-2 & P1-4
I only get momentary solenoid actuation, not continuous cycling.
Thanks fore your help,
Hi, I have notified our expert regarding this topic. Please expect a response by 3/15/19. Thanks, Costin
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In reply to Costin Cazana:
I'm using the DRV110EVM setup above with a TTL signal generator (1 Hz) into the Enable pin. I'm trying to drive a bank of six 12vdc solenoid valves (29 ohm each) connected in parallel (4.8 ohm to the DRV110). I can barely drive one valve with 14vdc supply. I tried using a Solid State Relay (SSR) but its turn-on and turn-off speed is too slow to effectively pass the PWM pulses.
What must I do to drive at least two or three of my solenoid valves? I have attached images of my setup.
Is it possible to use a faster SSR to drive the bank of six valves?
Thanks for your help,
In reply to Ken S:
Sorry for the late reply, very busy here. I did check a single valve connected to the DRV110EVM.
I adjusted Rpeak = 150kohm and Vs=14vdc.
Using a Fluke 179, I measured Ipeak = 0.38A and Ihold = 0.057A for a single valve.
- Now should I need to reduce Rsense? I will need to order a 1ohm resistor (in parallel to existing sense resistor). Can I install a pot?
- Will the final pcba setup allow me to use one valve or six valves without adjusting Rsense or pts?Thanks for your help,
For Rsense= 1ohm, the max Ipeak and Ihold is not enough to drive multiple solenoids:
Pot is ok, the only issue I can think about is the price
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