TMUX7348F datasheet(32/59 Pages) TI

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8.8 Fault Response Time

Fault response time (tRESPONSE) measures the delay between the source voltage exceeding the fault supply

voltage (VFP or VFN) by 0.5 V and the drain voltage failing to 50% of the maximum output voltage. Figure 8-9

shows the setup used to measure tRESPONSE.

0 V

tRESPONSE (FP)

Output

(VD)

VFP + 0.5 V

D/ DX

VDD VSS

VFP VFN

GND

VDD

VSS

0.1 µF

GND

0.1 µF

GND

0.1 µF

GND

VFN

0.1 µF

GND

VFP

All other

source

pins

0 V

Output

Output × 50%

VFP

tRESPONSE (FN)

Output

(VD)

VFN - 0.5 V

0 V

Output × 50%

VFN

tRESPONSE = max ( tRESPONSE(FP), tRESPONSE(FN))

Max positive fault

0 V

60V / µs

ramp

Max negative fault

60V / µs

ramp

Figure 8-9. Fault Response Time Measurement Setup

8.9 Fault Recovery Time

Fault recovery time (tRECOVERY) measures the delay between the source voltage falling from overvoltage

condition to below fault supply voltage (VFP or VFN) plus 0.5 V and the drain voltage rising from 0 V to 50%

of the final output voltage. Figure 8-10 shows the setup used to measure tRECOVERY.

tRECOVERY (FP)

Output

(VD)

VFP + 0.5 V

D/ DX

VDD VSS

VFP VFN

GND

VDD

VSS

0.1 µF

GND

0.1 µF

GND

0.1 µF

GND

VFN

0.1 µF

GND

VFP

All other

source

pins

0 V

Output

Output × 50%

Output

(VD)

0 V

tRECOVERY = max ( tRECOVERY(FP), tRECOVERY(FN))

0 V

VFN - 0.5 V

0 V

Output × 50%

tRECOVERY (FN)

Figure 8-10. Fault Recovery Time Measurement Setup

TMUX7348F

SCDS400 – MARCH 2022

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