Automotive proportional solenoid drive with highly accurate current sensor reference design
TIDA-020023
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Key Document
- Automotive Proportional Solenoid Drive W/ Highly-Accurate Current Sensor Ref. De (Rev. A)
(PDF 4521 KB)
15 May 2019
Description
This reference design demonstrates precise proportional solenoid drive using a simple push-pull output comparator and highly-accurate, integrated current shunt monitor. Precise and accurate control of proportional solenoids is especially necessary in the automatic transmission of a vehicle for smoother drivability. This design addresses two of the main factors that affect the precise position of a solenoid: drive and current-sense accuracy over temperature.
Features
- Current sense accuracy of 0.5% (FSR)
- Drive frequency and duty cycle: 1 kHz
- Integrated shunt facilitates more accuracy over a larger dynamic range
- Lower temperature drifts
- Wide common mode: –4 V to 80 V
- High-side drive, high-side solenoid monitor with enhanced PWM rejection
See the Important Notice and Disclaimer covering reference designs and other TI resources.