TPS272C45 datasheet(26/46 Pages) TI

部品番号	TPS272C45

部品情報	TPS272C45 45-m廓, Dual-Channel Smart High-Side Switch with Diagnostics

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Table 9-3. Device Fault Mux (continued)

INPUTS

OUTPUTS

SEL

CH1 FAULT

CH2 FAULT

SNS

FLT

1

Corresponds to fault

case(1)

Low

(1)

Table 9-4 describes this behavior

While typically the SNS pin output corresponds to ILOAD, in a fault case the switch turns off and ILOAD goes to

zero so the SNS behavior is modified in a fault case. In the event of a fault cases where SEL is monitoring the

proper channel, the SNS pin will output a voltage level corresponding to the fault type to enable improved

diagnosis as shown in Table 9-4.

By looking at the combination of the ENx condition, FLT , and SNS pins, it is possible to distinguish between fault

states. Each channel has independent fault states, so the table below applies to CH1 when SEL =LO and CH2

when SEL = HI.

Table 9-4. Distinguishing Different Fault Cases

Channel State

Fault Case

SNS

FLT

Enabled

Regulating Current past the initial inrush

delay set by ILIMD resistor

ISNSFH

Low

Short-to-Supply/Open Load

0

High

TJ Over Temperature

ISNSFH

Low

Disabled

Short-to-Supply/Open Load

ISNSFH

Low

TJ Over Temperature

0

High

9.3.4.2.1 Fault Event Diagrams

Note

All timing diagrams assume that the SEL pin is low to measure channel one behavior on the SNS pin.

DIA_EN and SEL pins have no effect on the FLT pin output.

The LATCH, SEL, DIA_EN, and ENx pins are controlled by the user. The timing diagrams represent

possible use-cases.

Figure 9-9 shows the device fault reporting behavior in the event of a fault in Channel 2 (only) with LATCH and

SEL pin set to LO. As shown, the fault signaling is deactivated when EN is toggled (in this case from HI to LO to

HI). The faulted channel can be determined by toggling the EN pin with a short pulse (less than 10-us wide) that

does not affect the output of the channel.

TPS272C45

SLVSF24 – DECEMBER 2020

www.ti.com

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