Core Evaluation: The TPA2296H-S6TR-S delivers precision high-side sensing with a measured offset of ±0.5 mV and an expansive common-mode range from −0.1 V to 70 V. With a CMRR of ~100 dB and 200 kHz bandwidth, it provides a robust solution for 12V–48V power monitoring systems, motor drivers, and battery management (BMS).
Background & Key Specifications
The TPA2296H-S6TR-S is a high-voltage, high-side current-sense amplifier with a voltage output. Its primary architecture is designed to minimize sensed-current error across wide common-mode spans common in industrial power rails. Tight offset and strong CMRR are critical for maintaining accuracy at low shunt voltages.
| Parameter | Value (typ / max) |
|---|---|
| Supply range | 3.0–18 V |
| Common-mode range | −0.1 V to 70 V |
| Input offset | ±0.5 mV |
| CMRR | ~100 dB |
| −3 dB bandwidth | ~200 kHz |
| Slew rate | 20 V/µs |
| Package / Temp | SOT-23-6 / −40 °C to +125 °C |
Electrical Performance Deep Dive
DC and Frequency Analysis
DC errors define the static measurement floor. For a 100 mΩ sense resistor, the ±0.5 mV offset equates to a ±5 mA apparent error. Frequency response is governed by a 200 kHz bandwidth and 20 V/µs slew rate, which constrain transient detection. Engineers should use RC filtering to balance noise suppression against the required step-response speed for motor stall or short-circuit detection.
Thermal Reliability
The rated operating range of −40 °C to +125 °C ensures stability in harsh environments. However, offset drift over temperature must be budgeted. Optimized PCB thermal paths and Kelvin-connection routing are essential to minimize junction-to-ambient temperature rise and maintain measurement linearity under sustained high common-mode loads.
Bench Test & Integration Guide
Validation requires a precision sense resistor and an isolated common-mode source. Sweep the common-mode voltage from 0V to 70V to characterize CMRR. In application, ensure the output voltage (Vout = Gain × Vsense) does not saturate the following ADC stage. For low-current sensing, increase the shunt resistance or implement firmware-based calibration to nullify the initial offset.
Frequently Asked Questions
What measurement error does input offset produce at low currents?
With ±0.5 mV offset and a 100 mΩ sense resistor, error equals ±5 mA. At low target currents this can dominate total error; increase Rsense or apply calibration if sub-milliamp resolution is required.
How should common-mode range be validated on the bench?
Sweep the common-mode voltage from 0 V up to 70 V while measuring offset and gain at fixed sense currents. Plot error versus common-mode to verify CMRR performance and identify any input-stage stress points.
Which test routines confirm long-term stability for production?
Perform HTOL (High-Temperature Operating Life), thermal cycling, and repeated high-voltage common-mode excursions. Monitor offset drift and CMRR degradation to set production acceptance limits.
Why is Kelvin sensing critical for this device?
Kelvin routing (4-wire sensing) prevents lead resistance from adding to the shunt voltage. This ensures the ±0.5 mV offset remains the dominant error source rather than parasitic voltage drops across high-current PCB traces.
