SIP32434

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Vishay Siliconix

S22-0384-Rev. B, 02-May-2022

13

Document Number: 63147

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UVLO turn off delay (TOFF_DLY) is typically 550 μs and turn on delay TON_DLY is typically 500 μs.

Fig. 35 - Switching Times

OVER-VOLTAGE PROTECTION (OVP)

The SIP32434A and SIP32434B implement overvoltage protection (OVP) on both the VIN and OVP pins to protect the output

load in the event of an input over-voltage. When the input exceeds the over-voltage protection thresholds VOVP(R) or the INOVP,

which is typically 24 V, the device turns off the output within tOVP, while the PGD asserts in the meantime. As long as an

over-voltage condition is present on the input, the device stays disabled and the output will be turned off. Over-voltage is a

non-latchable fault. Once the input voltage returns to the normal operating range, the device attempts to start up normally.

Fig. 36

OVP voltage divider resistors total resistance should not be over 2.5 M

.

VIN

VOUT

VUVPR

EN/UVLO

TON

VUVPF

TR

TON_DLY

TF

10 %

90 %

TOFF_DLY

IN

GND

OVP

ROVP1

ROVP2

Power

source

SIP32434

R

OVP1

R

OVP2

---------------- =

V

IN(OVP) - 1.2 V

1.2 V

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