TPS274C65AS datasheet(40/87 Pages) TI

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9.3.6.3 Short-to-Battery and Open-Load Detection

The TPS274C65 is capable of detecting short-to-battery and open-load events regardless of whether the switch

is turned on or off, however the two conditions use different methods to signify fault. This feature enables

systems to recognize mis-wiring or wire-break events.

9.3.6.4 On-State Wire-Break Detection

When the switch is enabled, TPS274C65 supports on-state open load detecttion as low as 0.32mA. In order

to achieve this accuracy, TPS274C65 uses a higher resistance path that is enabled for a short period of

time(TWB_ON1). If the WB_ON is kept high, the higher resistance path will be turned on again after 100ms retry

time. The wire-break will also be retried whenever the WB_ON signal is toggled. Please refer to Figure 9-31

for the wire-break detection timing diagram. This functionality is enabled when EN_WB_ON and diagnostics

are enabled, during this time open-load threshold will be detected and signaled through WB_ON_FLT bit if wire

break is detected.

Table 9-8. Open-Load ON-State Detection Threshold

WB_ON_THD[2]

WB_ON_THD[1]

WB_ON_THD[0]

Typical Current Threshold (mA)

0.32

0.64

0.96

1.28

1.6

1.92

2.24

2.56

TPS274C65

SLVSFZ2B – APRIL 2023 – REVISED OCTOBER 2023

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TPS274C65AS Datasheet(PDF) 40 Page - Texas Instruments