AN2985 datasheet(6/19 Pages) STMICROELECTRONICS

6 / 19 page

STEVAL-IFP010V3 demonstration board

AN2985

6/19

Doc ID 15716 Rev 2

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Open load in off state and short to Vcc detection

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Open drain diagnostic outputs

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3.3 V CMOS/TTL compatible inputs

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Fast demagnetization of inductive loads

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Conforms to IEC 61131-2

Figure 2.

Block diagram

Active current limitation avoids that the system power supply drops in case of a shorted

load. In overload condition, the channel turns off and back on automatically after the IC

temperatures decreases below a threshold set by a temperature hysteresis so that junction

temperature is controlled.

If this condition makes the case temperature reach the case temperature limit (TCSD),

overloaded channels are turned off (i.e. the channels for which junction temperature has

exceeded the junction protection threshold, TjSD, and has not fallen below the junction

protection reset threshold, TjR). These channels restart, non-simultaneously, only when the

case temperature decreases below the case protection reset threshold (TCR). Non-

overloaded channels continue to operate normally.

The open drain diagnostic outputs indicate related channel overtemperature conditions.

1.4

Electrical characteristics

The electrical characteristics of the VNI2140J demonstration board (STEVAL-IFP010V3)

are given in

Table 1.

AN2985 Datasheet(PDF) 6 Page - STMicroelectronics