VN5E160ASOTR-E datasheet(26/37 Pages) STMICROELECTRONICS

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Application information

VN5E160ASO-E

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Doc ID 022475 Rev. 5

3.4

Current sense and diagnostic

The current sense pin performs a double function (see Figure 33: Current sense and

diagnostic):

●

Current mirror of the load current in normal operation, delivering a current

proportional to the load current according to a known ratio KX.

The current ISENSE can be easily converted to a voltage VSENSE by means of an

external resistor RSENSE. Linearity between IOUT and VSENSE is ensured up to 5 V

minimum (see parameter VSENSE in Table 9: Current sense (8 V < VCC < 18 V)). The

current sense accuracy depends on the output current (refer to current sense electrical

characteristics Table 9: Current sense (8 V < VCC < 18 V)).

●

Diagnostic flag in fault conditions, delivering a fixed voltage VSENSEH up to a

maximum current ISENSEH in case of the following fault conditions (refer to

Table 11: Truth table):

–

Power limitation activation

–

Overtemperature

–

Short to VCC in OFF-state

–

Open-load in OFF-state with additional external components.

A logic high-level on the CS_DIS pin simultaneously sets all the current sense pins of the

device in a high impedance state, thus disabling the current monitoring and diagnostic

detection. This feature allows multiplexing of the microcontroller analog inputs by sharing

the sense resistance and ADC line among different devices.

Figure 33.

Current sense and diagnostic

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