TMCS1100

• 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-V_DC/V_PK working isolation
  • 3-kV_RMS 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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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.