TMCS1100 Precision isolated current sensor with external reference | TI.com

TMCS1100
This product is prototype/experimental and has not been released to the market. Testing and final processes may not be complete. This product may be subject to further changes or possible discontinuation.
Precision isolated current sensor with external reference

 

Sample availability

Preproduction samples are available (PMCS1100AxQDR). Request now

Description

The TMCS1100 is a galvanically isolated Hall-effect current sensor capable of dc or ac current measurement with high accuracy, excellent linearity, and temperature stability. A low-drift, temperature-compensated signal chain provides < 1% full-scale error across the entire device temperature range.

The input current flows through an internal 1.8-mΩ conductor that generates a magnetic field measured by an integrated Hall-effect sensor. This structure eliminates external concentrators and simplifies PCB design. Low conductor resistance minimizes power loss and thermal dissipation. Inherent galvanic insulation provides a 600-V basic working isolation and 3-kV dielectric withstand isolation between the current path and circuitry. Integrated electrical shielding enables excellent common-mode rejection and transient immunity protection.

The output voltage is proportional to the input current with four sensitivity options. Fixed sensitivity allows the TMCS1100 to operate from a single 3-V to 5.5-V power supply, eliminates ratiometry errors, and improves supply noise rejection. The current polarity is considered positive when flowing into the positive input pin. The VREF input pin provides a variable zero-current output voltage, enabling bidirectional or unidirectional current sensing.

The TMCS1100 draws a maximum supply current of 5 mA, and all sensitivity options are specified over the operating temperature range of –40°C to +125°C.

Features

  • Total error current sensing: < 1%
    • Sensitivity error: ±0.3%, –40ºC to +125ºC
    • Offset error: ±10.5 mA, –40ºC to +125ºC
    • Offset current drift: 0.01 mA/°C
    • Linearity over temperature: 0.1% typ
  • UL1577, VDE 0884-11, 60950 certifications planned
    • 600-VDC/VPK working isolation
    • 3-kVRMS withstand isolation
  • Bidirectional and unidirectional linear current sensing
  • External reference voltage enables variable measurable ranges and differential signal chains
  • Operating supply range: 3 V to 5.5 V
  • Signal bandwidth: 80-kHz
  • Multiple sensitivity options:
    • TMCS1100A1: 50 mV/A
    • TMCS1100A2: 100 mV/A
    • TMCS1100A3: 200 mV/A
    • TMCS1100A4: 400 mV/A

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Parametrics

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Part number Order Continuous current (Max) (A) Sensitivity (Typ) (mV/A) Sensitivity error (%) Sensitivity error drift (+/-) (Max) (ppm/°C) Input offset current (+/-) (Max) (mA) Input offset current drift (+/-) (Typ) (µA/°C) Features Small signal bandwidth (kHz) Supply voltage (Max) (V) Supply voltage (Min) (V) Iq (Max) (mA) CMTI (kV/µs)
TMCS1100 Order now 20     50
100
200
400    
0.2     50     25     0.1     Externally Driven Zero Current Reference Voltage     80     5.5     3     5     25    
TMCS1101 Order now 20     50
100
200
400    
0.3     50     37.5     0.1     Internal Zero Current Reference Voltage     80     5.5     3     5     25