INA780BIDEKR datasheet(29/51 Pages) TI1

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Figure 7-4 shows a slightly longer worst case alert response because the alert threshold is within the noise band

of the device measurement and signal.

Minimum Delay: 41 µs

TIME (50µs / div)

Fault Threshold: 10 A

Maximum Delay: 225 µs

Over Current Level: 28 A

Figure 7-3. Alert Response Time (Sampled Values

Significantly Above Threshold)

Minimum Delay: 46 µs

TIME (50µs / div)

Fault Threshold: 27.5 A

Maximum Delay: 281 µs

Over Current Level: 28 A

Figure 7-4. Alert Response Time (Sampled Values

Slightly Above Threshold)

7.3 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 5 V, whereas the

load power-supply voltage being monitored (the common-mode voltage) can be as high as 85 V. Note that the

device can also withstand the full 0 V to 85 V 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.

7.4 Layout

7.4.1 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 0.1 µF. Applications with noisy or high-impedance

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

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INA780A, INA780B

SBOSAB6A – JULY 2023 – REVISED DECEMBER 2023

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INA780BIDEKR Datasheet(PDF) 29 Page - Texas Instruments