Dear Engineers,
Please let me know the below design will meet using the DRV110 solenoid driver...Our Requirement is,
Inductance of the solenoid = 25mH
Resistance of the solenoid = 11.5 ohm
Peak current reqd, Ipeak = 9 A
Required peak time, tkeep = 100 ms
I have choosen the below values based on the Calculations in the datsheet and EVM
Rosc = 0 Ohm (To set default freq = 20 kHz)
Ckeep = 1 uF (To set the peak time of 100 ms)
Rsense = 0.1 Ohm
Ipeak = 900 mV / 0.1 Ohm = 9 A , So Rpeak = 50 Kohm & Rhold = 50 Kohm
Vin = 15V, Vout =15V
Please clarify whether calculations are right else correct me. During the test, it seems no variation in the ON period of the PWM..It seems in 10% only between the 0W to 300Watts...
I have been using EVM by just adding the External Mosfet and current sense resistor..
Mosfet Spec are, Vdss = 600V, Id = 18.5 A, Rds(on) = 0.19 Ohm
Its seems the Mosfet get short between gate to source if i increase the watts...I am doing analysis here to find the issue.. I am looking great support from this forum..
Thanks in advance,
Elango
