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BTS5016-1EKB Datasheet, PDF (31/53 Pages) Infineon Technologies AG – Smart High-Side Power Switch
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7.3.3 SENSE Signal in Open Load
BTS5016-1EKB
Diagnostic Functions
7.3.3.1 Open Load in ON Diagnostic
If the channel is ON, a leakage current can still flow through an open load, for example due to humidity. The
parameter IL(OL) gives the threshold of recognition for this leakage current. If the current IL flowing out the power
DMOS is below this value, the device recognizes a failure, if the DEN is selected. In that case, the SENSE current
is below IIS(OL). Otherwise, the minimum SENSE current is given above parameter IIS(OL). Figure 24 shows the
SENSE current behavior in this area. The red curve shows a typical product curve. The blue curve shows the ideal
current sense ratio.
IIS
IIS(OL)
Figure 24 Current Sense Ratio for Low Currents
IL(OL)
IL
Sense for OL .vsd
7.3.3.2 Open Load in OFF Diagnostic
For open load diagnosis in OFF-state, an external output pull-up resistor (ROL) is recommended. For the
calculation of pull-up resistor value, the leakage currents and the open load threshold voltage VOL(OFF) have to be
taken into account. Figure 25 gives a sketch of the situation. Ileakage defines the leakage current in the complete
system, including IL(OFF) (see Chapter 5.5) and external leakages, e.g, due to humidity, corrosion, etc.... in the
application.
To reduce the stand-by current of the system, an open load resistor switch SOL is recommended. If the channel x
is OFF, the output is no longer pulled down by the load and VOUT voltage rises to nearly VS. This is recognized by
the device as an open load. The voltage threshold is given by VOL(OFF). In that case, the SENSE signal is switched
to the IIS(FAULT).
An additional RPD resistor can be used to pull VOUT to 0V. Otherwise, the OUT pin is floating. This resistor can be
used as well for short circuit to battery detection, see Chapter 7.3.4.
Data Sheet
PROFET™+ 12V
31
Rev. 2.0, 2012-04-17
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