INA745AIRELR datasheet(37/50 Pages) TI2

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Minimum Delay: 41µs

TIME (50µs / div)

Fault Threshold: 10A

Maximum Delay: 225µs

Over Current Level: 28A

Figure 8-3. Alert Response Time (Sampled Values

Significantly Above Threshold)

Minimum Delay: 46µs

TIME (50µs / div)

Fault Threshold: 27.5A

Maximum Delay: 281µs

Over Current Level: 28A

Figure 8-4. Alert Response Time (Sampled Values

Slightly Above Threshold)

8.3 Power Supply Recommendations

The input circuitry of the device can accurately measure signals on common-mode voltages beyond the power-

supply voltage, VS. For example, the voltage applied to the VS power supply terminal can be 5V, whereas the

load power-supply voltage being monitored (the common-mode voltage) can be as high as 40V. Note that the

device can also withstand the full 0V to 40V range at the input terminals, regardless of whether the device has

power applied or not. Avoid applications where the GND pin is disconnected while device is actively powered.

8.4 Layout

8.4.1 Layout Guidelines

Place the required power-supply bypass capacitors as close as possible to the supply and ground terminals of

the device. A typical value for this supply bypass capacitor is 0.1µF. Applications with noisy or high-impedance

power supplies can require additional decoupling capacitors to reject power-supply noise.

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INA745A, INA745B

SBOSAC3B – JULY 2023 – REVISED AUGUST 2025

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INA745AIRELR 数据表(PDF) 37 Page - Texas Instruments