描述 Description

The TMCS1126 is a galvanically isolated Hall-effect current sensor with industry leading isolation and accuracy. An output voltage proportional to the input current is provided with excellent linearity and low drift at all sensitivity options. Precision signal conditioning circuitry with built-in drift compensation is capable of less than 1.45% maximum total error over temperature and lifetime with no system level calibration, or less than 1% maximum total error including both lifetime and temperature drift with a one-time calibration at room temperature.

AC or DC input current flows through an internal conductor generating a magnetic field measured by integrated on-chip Hall-effect sensors. Core-less construction eliminates the need for magnetic concentrators. Differential Hall sensors reject interference from stray external magnetic fields. Low conductor resistance increases measurable current ranges up to ±103A while minimizing power loss and easing thermal dissipation requirements. Insulation capable of withstanding 5000VRMS, coupled with minimum 8.1 mm creepage and clearance provide up to 1100VDC reliable lifetime reinforced working voltage. Integrated shielding enables excellent common-mode rejection and transient immunity.

Fixed sensitivity allows the device to operate from a single 3V to 5.5V power supply, eliminating ratiometry errors and improving supply noise rejection. TI provides the TMCS1126xxB as a lower-cost option.

特性 Features

? High continuous current capability: 82 ARMS
? Robust reinforced isolation
? Withstand isolation voltage: 5000 VRMS
? Reinforced working voltage: 1100 VDC

? High accuracy
? Sensitivity error: ±0.1%
? Sensitivity drift: ±20 ppm/°C
? Offset error: ±0.2 mV
? Offset drift: ±2 μV/°C
? Non-linearity: ±0.1%

? Low lifetime drift: ±0.5% (maximum)
? High immunity to external magnetic fields
? Precision zero-current reference output
? Signal bandwidth: 500 kHz
? Low propagation delay: 95 ns
? Fast overcurrent detection response: 100 ns
? Operating supply range: 3 V to 5.5 V
? Bidirectional and unidirectional current sensing
? Multiple sensitivity options:
? TMCS1126x6x: 15 mV/A
? TMCS1126x1x: 25 mV/A
? TMCS1126x7x: 30 mV/A
? TMCS1126x9x: 33 mV/A
? TMCS1126x8x: 40 mV/A
? TMCS1126x2x: 50 mV/A
? TMCS1126x3x: 75 mV/A
? TMCS1126x4x: 100 mV/A
? TMCS1126x5x: 150 mV/A

? Safety related certifications (planned)
? UL 1577 Component Recognition Program
? IEC/CB 62368-1