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.
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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)|
|0.2||50||25||0.1||Externally Driven Zero Current Reference Voltage||80||5.5||3||5||25|
|0.3||50||37.5||0.1||Internal Zero Current Reference Voltage||80||5.5||3||5||25|