News
STMicroelectronics’ new bidirectional current-sense amplifiers deliver high accuracy and low bill-of-materials in industrial and automotive applications
29/02/2024
With 100V-tolerant inputs and internally fixed gain, STMicroelectronics’ TSC2020 bidirectional current-sense amplifier ensures high accuracy and saves space by eliminating external components typically needed for protection and gain-setting configuration. It addresses applications such as servers, power tools, industrial motor control, and power supplies. It is also AEC-Q100 qualified, allowing use in automotive applications such as motor-controlled window lifters, the battery management system (BMS), and traction inverters.
Suitable for high-side or low-side current sensing, the TSC2020 has a wide common-mode voltage range from -4V to 100V that allows use in 48V systems and at higher voltages. Precision internal circuitry ensures input offset voltage within ±150µV that helps to greatly reduce the external shunt resistor size, lowering power dissipation. Its ability to sense very low drop voltages helps minimize measurement errors. Common-mode rejection of at least 100dB ensures consistent accuracy when exposed to fluctuating common-mode voltages in applications such as inline motor control. Also, enhanced PWM rejection ensures high immunity to noise in motor drives and switched-mode power converters.
As well as saving external components, which reduces the bill of materials, the TSC2020’s fixed gain of 20V/V ensures high accuracy and stability with 0.3% gain error and 3.5ppm/°C drift. In addition, no trimming is required.
The TSC2020 is in mass production now and available in a choice of SO8 and Mini SO8 packages. Pricing starts at $1.20 for 1000 units and free samples are available from the ST eStore. Both industrial and automotive-grade versions are part of ST’s 10-years longevity program that ensures long-term product availability.
TSC2020 is a precision bidirectional current sense amplifier. It can sense current via a shunt resistor over a wide range of common-mode voltages, from -4 to +100 V, whatever the supply voltage is. It is able to sense very low drop voltages, minimizing measurement error.
TSC2020 is a current sense amplifier that may be used for various functions like precision current measurement, overcurrent protection, current monitoring, and feedback loops. This device fully operates over the supply voltage range of 2.7 to 5.5 V, and over the industrial temperature range of -40 to 125 °C.
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All features
- Wide common-mode voltage: -4 to 100 V
- High common-mode rejection CMR: 100 dB min.
- Offset voltage: ±150 µV max.
- Offset drift: 0.5 µV/°C max.
- Enhanced PWM rejection
- 2.7 to 5.5 V supply voltage
- Internal fixed gain 20 V/V
- Gain error: 0.3% max.
- Gain drift: 3.5 ppm/°C max.
- SO8 and MiniSO8 package
- AEC-Q100 qualified
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