UM1556 datasheet(23/87 Pages) STMICROELECTRONICS

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UM1556

Analogue current sense

Doc ID 023520 Rev 2

23/87

Analogue current sense

2.1

Introduction

With the introduction of the novel VIPower M0-5 technology, important improvements have

been introduced to the analog current sense operation.

The block diagram of a M0-5 High Side Drive with analog current sense is reported in

Figure 24.

In line with the previous generations, the current sense block has a double function:

●

Current mirror of the load current in normal operation. This delivers a current

proportional to the load current according to a known ratio named K

●

Diagnostics flag in fault conditions. This delivers a fixed voltage with a certain current

capability in case of overtemperature conditions.

The current delivered by the current sense circuit can be easily converted to a voltage by

means of an external sense resistor, thus allowing continuous load monitoring and

abnormal-condition detection.

Figure 24.

M0-5 High Side Driver with analogue current sense – block diagram

2.2

Simplified principle of operation

The simplified block diagram of the M0-5 analog current sense is shown in Figure 25.

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