TSC102 – High-side current sense amplifier plus signal conditioning amplifier
High-Side Current-Sensing Amplifier with Accurate, Rugged, Low-Power Amplifiers for Automotive, Industrial and Computer Applications
Description:
TSC102 is a high-side current-sensing amplifier with low power consumption that is designed for direct connection to a small current-sensing resistor sitting at a voltage up to 30V. This direct connection allows a system to be monitored without disturbing its ground connection, which is essential in applications such as automotive systems or for monitoring power supplies with multiple outputs. The device also has rugged inputs to survive applied voltages ranging from -16V to 60V. These voltages can arise in systems where many loads are switching continuously or there is a risk of a reverse battery connection, such as in vehicle electrical infrastructures.
The TSC102 integrates two op-amps. Unlike competing devices, it provides full access to the pins of the second op-amp. This access allows designers to implement a variety of signal-conditioning functions such as gain adjustment to optimize the range of the output signal. The op-amp can also be configured as a comparator to implement over-current protection, or as a first- or second-order low-pass filter to promote stable sensing in systems where noise is present.
The TSC102 measures a small differential voltage on a high-side shunt resistor and translates it into a ground-referenced output voltage.
The device’s wide input common-mode voltage range, low quiescent current and tiny TSSOP8 packaging enable use in a wide variety of
applications (also available in SO-8 package). The input common-mode and power supply voltages are independent. The common-mode voltage can range from 2.8 to 30 V in operating conditions. The TSC102 is rugged against abnormal conditions on the input pins: Vp and Vm can withstand up to 60 V in case of voltage spikes, as little as -16 V in case of reversed battery, and up to 4 kV in case of electrostatic discharge. In addition to the current sensing amplifier, the TSC102 offers a fully accessible amplifier for output signal conditioning. The device’s overall current consumption is lower than 420 µA.
Features:
- Independent supply and input common-mode voltages
- Wide common-mode operating range:
2.8 to 30 V - Wide common-mode surviving range:
-16 to 60 V (reversed battery and load-dump
conditions) - Low current consumption: ICC max = 420 µA
- Output amplifier for tailor-made signal
conditioning - -40 to 125° C operating temperature range
- 4 kV ESD protection
Applications:
- Battery chargers
- Automotive current monitoring
- Notebook computers
- DC motor control
- Photovoltaic systems
- Precision current sources
- Uninterruptible power supplies
- High-end power supplies
Diagram:
Source: STMicroelectronics
