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Table 8-1. Common Hysteresis Lookup Table

TARGET

DEVICE ACTUAL HYSTERESIS OPTION

DETECT THRESHOLD

TOPOLOGY

RELEASE VOLTAGE (V)

18.0 V

Over-voltage

17.5 V

-3%

18.0 V

Over-voltage

16.0 V

-11%

17.0 V

Over-voltage

16.5 V

-3%

16.0 V

Over-voltage

15.0 V

-6%

15.0 V

Over-voltage

14.0 V

-7%

6.0 V

Under-Voltage

6.5 V

0.5 V

5.5 V

Under-Voltage

6 V

0.5 V

8 V

Under-Voltage

9 V

1 V

5 V

Under-Voltage

7.5 V

2.5 V

Table 8-1 shows a sample of hysteresis and voltage options for the TPS38-Q1. For threshold voltages ranging

from 2.7 V to 8 V, one option is to select a fixed hysteresis value ranging from 0.5 V to 2.5 V in increments of

0.5 V. Additionally, a second option can be selected where the hysteresis value is a percentage of the threshold

voltage. The percentage of voltage hysteresis ranges from 2% to 13%.

Knowing the amount of hysteresis voltage, the release voltage for the undervoltage (UV) channel is

(VITN(UV) + VHYS) and for the overvoltage (OV) channel is (VITP(OV) - VHYS). For a visual understanding of the UV

and OV release voltage, see Figure 7-1 and Figure 7-2. The accuracy of the release voltage, or stated in the

Section 7.5 as Hysteresis Accuracy is ±1.5%. Expanding what is shown in Table 8-1, below are a few voltage

hysteresis examples that include the hysteresis accuracy:

Undervoltage (UV) Channel

VITN = 0.8 V

Voltage Hysteresis (VHYS) = 5% = 40 mV

Hysteresis Accuracy = ±1.5% = 39.4 mV or 40.6 mV

Release Voltage = VITN + VHYS = 839.4 mV to 840.6 mV

Overvoltage (OV) Channel

VITP = 8 V

Voltage Hysteresis (VHYS) = 2 V

Hysteresis Accuracy = ±1.5% = 1.97 V or 2.03 V

Release Voltage = VITP − VHYS = 5.97 V to 6.03V

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TPS38-Q1

SNVSBI8C – AUGUST 2020 – REVISED DECEMBER 2021

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