TSC101BILT
Part Number: TSC101BILT
Manufacturer: STMicroelectronics
Description: Current Sense Amplifiers HIGH SIDE CURRENT INT FIXED GAIN 50V/V
Shipped from: Shenzhen/HK Warehouse
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TSC101BILT Description
The TSC101 produces a ground-referenced output voltage by converting a small differential voltage measured on a high-side shunt resistor. The gain is fixed internally. A vast number of applications are made possible by the small SOT23 package, low quiescent current, and wide input common-mode voltage range. Both the power supply voltage and the input common-mode voltage are separate.
The working circumstances for the common-mode voltage can be between 2.8 and 30 V, and the absolute maximum rating conditions can be up to 60 V. The power supply can be connected to either side of the current measurement shunt with a few mistakes thanks to the wide supply voltage range and current usage < 300 A.
TSC101BILT Features
- Separate common-mode supply and input voltages
- 8 to 30 V is a sizeable common-mode working range.
- -0.3 to 60 V, an extensive common-mode survival range (load-dump).
- 4 to 24 V is a sizable supply voltage range.
- Low current usage: ICC maximum 300 A.
- 20 V/V, 50 V/V, or 100 V/V of internally fixed gain.
Parameter definitions
Average expected mode rejection rate (CMR) The current-sensing amplifier’s capacity to reject any DC voltage applied to inputs Vp, and Vm is measured by the common-mode rejection ratio (CMR). So that the CMR’s impact may be compared to the applied differential signal, the CMR is referenced back to the input. According to the following formula, the CMR is determined:
● Supply voltage rejection ratio (SVR)
The current-sensing amplifier’s capacity to reject variations in the supply voltage VCC is gauged by the supply-voltage rejection ratio or SVR. To compare the influence of the SVR with the applied differential signal, the SVR is referenced back to the input. The following formula determines the SVR:
● Gain (Av) and input offset voltage (Vos)
The input offset voltage is determined by the point where the X-axis and the linear regression of the Vout versus Vsense curve cross. The following formula can be used to determine Vos if Vout1 is the output voltage and Vsense=Vsense1=50 mV and Vout2 is the output voltage, and Vsense=Vsense2=5 mV:
The ratio of the output voltage to the input differential voltage is known as the amplification gain Av:
output voltage variation in relation to temperature The output voltage drift versus temperature is defined as the highest departure of Vout from its value at 25°C over the temperature range. The equation reads as follows:
With Tmin < Tamb < Tma
● Precise output voltage
The accuracy of the output voltage is the difference between the actual and predicted voltages. The ideal input differential voltage multiplied by the theoretical gain is what the following calculation demonstrates to be the ideal current sensing output voltage.
Frequently Asked Questions
What are Current Sense Amplifiers?
Current sense amplifiers, sometimes referred to as current shunt monitors, are specialized differential amplifiers with a precisely matched resistive gain network that contain the following characteristics:
- Designed to monitor the current flow by measuring the voltage drop across a sensing element, typically a shunt resistor
- Tend to be easier to use, more precise and less prone to noise
- Support currents from 10s of µA to 100s of A
- Support common-mode voltages that range from -16 to +80 V natively, and that can be increased to 100 volts with additional circuitry.
What are the Key parameters of Current Sense Amplifiers?
● Common Mode Range
This specification outlines the DC voltage range about the ground at an amplifier’s input. By design, current sensing amplifiers often support common-mode voltages much above the chip supply voltage. For instance, the INA240 can function with a supply as low as 2.7 V and support common-mode voltages between -4 V and +80 V.
● Offset Voltage
This differential DC error is present at the amplifier’s input. Historically, bigger value shunt resistors were employed to increase the measured voltage drop and lessen amplifiers’ influence with high offsets. Today, TI can provide current sense amplifiers with offsets as low as 10 V, allowing higher precision measurements at low currents and smaller value shunt resistors for increased system efficiency.
● Gain
With a carefully matched resistive gain network integrated, current sense amplifiers offer various gain options with reliable performance despite changes in process and temperature. For fixed gain amplifiers, there are different gain options ranging from 0.125 V/V to 1000 V/V with gain errors as low as 0.01%.
● Temperature Stability
A modest and uniform temperature drift is made possible by integrating the amplifier and all of the gain-setting resistors in current-sense amplifiers. This makes it possible to measure current accurately over the entire range of temperatures. One of the main benefits of current sense amplifiers over discrete implementations is the achieved temperature stability.
What is the gain in the current sense amplifier?
With a carefully matched resistive gain network integrated, current sense amplifiers offer various gain options with reliable performance despite changes in process and temperature. For fixed gain amplifiers, there are different gain options ranging from 0.125 V/V to 1000 V/V with gain errors as low as 0.01%.
What is standard mode voltage in a current sense amplifier?
The power supply’s maximum voltage should not be exceeded by the current sense amplifier’s standard mode voltage. A current sense amplifier must be designed with a maximum standard mode voltage supporting 96 V; for instance, if a current is measured on a 48 V power supply with a transient voltage not exceeding 96 V.
The Best Current Sense Amplifier for Your Design: How to Choose It?
Define the configuration that your gadget needs.
● High-side configuration
Choose the appropriate current sense amplifier depending on the application’s required maximum common mode voltage (VICM) and its power supply.
● Low-side configuration
Choose a current sense amplifier that can operate at a standard mode voltage of nearly zero volts.
It is also possible to use operational amplifiers by adjusting the gain by adding 4 external resistors. However, the PCB’s size will increase, and its accuracy could decline.
● If accurate measurements are needed
It is necessary to consider several application-related factors. The voltage drop into the shunt resistor might be relatively modest (hundreds of V), depending on the current range to be measured and the shunt resistor employed. It is crucial to consider accuracy gain and offset error for greater precision.
Conclusion
A high-side shunt resistor’s small differential voltage is measured by a high-side current sense amplifier, which then converts the reading into an output voltage referenced to the ground—internal fixation of the gain. Applications for precision current sources and automotive current monitoring typically include notebook computers, photovoltaic systems, battery chargers, and battery controls.
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