Automotive shunt-based isolated current sensor reference design for DC/DC and OBC applications
Description
This reference design demonstrates high-side primary current sensing in DC/DC converter and onboard charger (OBC) applications for hybrid and electric vehicles. Using an isolated shunt approach for current sensing has several advantages: including high accuracy: linearity and robustness. However: the large input range of isolated amplifiers causes the shunt to experience high power dissipation. To solve this problem: this reference design utilizes a lower input range isolated amplifier: reducing power dissipation while maintaining the advantages of the shunt-based approach.
Features
- Lower input range of +/-50 mV facilitates lower power dissipations on the shunt3-us latency (fast response) with the isolated amplifierHigh-side current sense circuit with CMTI of 140 kV/μs (typical): 70 kV/μs (minimum)Un-calibrated accuracy of less than 1% across temperature range of -40ºC to 125ºC (AMC output)Interfaces directly with differential- or single-ended ADC
Applications
- AC analog input module
- Powertrain current sensor
- Fuel cell control unit (FCCU)
- 1-phase AC-digital control
- 3-phase AC-analog control
- 1-phase AC-analog control
- 3-phase AC-digital control
- OBC-wireless charging
- Unidirectional 400 V & 800 V to LV
- Unidirectional HV-to-LV digital loop
- 48-V to 12-V DC/DC converter
- Bidirectional 400-V & 800-V to LV
Product Categories
- Amplifiers