INA302

VS

OUT

IN+

IN-

Power Supply

0 V to 36 V

2.7 V to 5.5 V

+

Load

ALERT2

LIMIT2

GND

ALERT1

LIMIT1

RLIMIT1

RLIMIT2

RPULL-UP1

Supply

CDELAY

DELAY

tDELAY

Warning Threshold

Fault/Critical Threshold

RPULL-UP2

Supply

INPUT SIGNAL

VOUT

LATCH1

LATCH2

ALERT1

ALERT2

REF

RSENSE

VLIMIT1

VLIMIT2

GND

16

INA302, INA303

SBOS775C – SEPTEMBER 2016 – REVISED MARCH 2019

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Feature Description (continued)

Figure 42 shows the alert output response of the internal comparators for the INA302. When the output voltage

of the current-sense amplifier is less than the voltage developed on either limit pin, both ALERTx outputs are in

the default high state. When the current sense amplifier output is greater than the threshold voltage set by the

LIMIT2 pin, the ALERT2 output pulls low after a delay time set by the external delay capacitor. The lower

overcurrent threshold is commonly referred to as the overcurrent warning threshold. If the current continues to

rise until the current-sense amplifier output voltage exceeds the threshold voltage set at the LIMIT1 pin, then the

ALERT1 output becomes active and immediately pulls low. The low voltage on ALERT1 indicates that the

measured signal at the amplifier input has exceeded the programmed threshold level, indicating an overcurrent

condition has occurred. The upper threshold is commonly referred to as the fault or system critical threshold.

Systems often initiate protection procedures (such as a system shutdown) when the current exceeds this

threshold.

Figure 42. Out-of-Range Alert Responses for the INA302