Part Number:DRV8841
Hi team,
The customer is using DRV8841.
In first mode it should pump around 200mA where as in another mode it should drive around 80mA current.
The attached is the customer's schematics based on DRV8841IC for drive circuit where SOV load is around 60 Ohm, 6.5mH.
The customer evaluates this circuit in breadboard. Followings are the customer's ideas:
1. When load is not connected & the customer is enabling the driver A or B, the AOUT/BOUT is a PWM signal with 4uS as turn off time & time period of 20uS.
2. When SOV load is connected with a condition of 100% bridge current, the AOUT/BOUT is showing continuous 28V in place of an expected PWM signal of different duty cycle.
Q1: Is there any problem for the customer's ideas?
Q2: Is the customer's schematics correct?
Q3: Can you give me some suggestions for the customer's design?
Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments