UM1693 datasheet(52/196 Pages) STMICROELECTRONICS

52 / 196 page

Usage/handling of fault reset and standby

UM1693

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DocID025505 Rev 1

Figure 29. Standby mode activation

The device leaves the Standby mode when any of the above mentioned pins is set high (see

Figure 30).

Figure 30. Standby state diagram

4.3

Flexible blanking time (fault reset management)

On one hand the use of the latch-off functionality provides significant benefits to the

application in terms of safety and reliability due to the very fast reaction and protection

against hazardous conditions induced by heavy overload or short circuit events. On the

other hand it requires from the user a proper selection of the suitable high-side driver for a

given load, in example through load compatibility studies (refer to Chapter 6: Load

compatibility). Concretely, the latch-off functionality might interfere with the load, in case it

has an inrush characteristic as for example an incandescent bulb, a DC motor or a

capacitive load. The transient current, which typically has the highest peak at low ambient

Normal Operation

Stand-by Mode

INx = Low

AND

FaultRST = Low

AND

SEn = Low

AND

SELx = Low

INx = High

FaultRST = High

SEn = High

SELx = High

{

t > t D_STBY

UM1693 Datasheet(PDF) 52 Page - STMicroelectronics