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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

Overvoltage

17.5 V

-3%

18.0 V

Overvoltage

16.0 V

-11%

17.0 V

Overvoltage

16.5 V

-3%

16.0 V

Overvoltage

15.0 V

-6%

15.0 V

Overvoltage

14.0 V

-7%

6.0 V

Undervoltage

6.5 V

0.5 V

5.5 V

Undervoltage

6 V

0.5 V

8 V

Undervoltage

9 V

1 V

5 V

Undervoltage

7.5 V

2.5 V

Table 8-1 shows a sample of hysteresis and voltage options for the TPS37. 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 SENSEx Undervoltage (UV) Timing Diagram and SENSEx Overvoltage (OV)

Timing Diagram. 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 6.03 V

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TPS37

SNVSBJ1D – OCTOBER 2020 – REVISED DECEMBER 2021

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