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BTS7020-2EPA Datasheet(PDF) 44 Page - Infineon Technologies AG

No. de pieza BTS7020-2EPA
Descripción Electrónicos  Smart High-Side Power Switch
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Fabricante Electrónico  INFINEON [Infineon Technologies AG]
Página de inicio  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

BTS7020-2EPA Datasheet(HTML) 44 Page - Infineon Technologies AG

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Data Sheet
44
Rev. 1.00
2017-08-24
BTS7020-2EPA
PROFETTM+2
Diagnosis
9.3.1
Open Load current (IIS(OLOFF))
In OFF state, when DEN pin is set to “high” and a channel is selected using DSEL pin, the VDS voltage is
compared with a threshold voltage VDS(OLOFF). If the load is properly connected and there is no short circuit to
battery, VDS ~ VS therefore VDS > VDS(OLOFF). When the diagnosis is active and VDS ≤ VDS(OLOFF), a current IIS(OLOFF) is
provided by IS pin. Figure 38 shows the relationship between IIS(OLOFF) and IIS(FAULT) as functions of VDS. The two
currents do not overlap making always possible to differentiate between Open Load in OFF and Fault
condition.
Figure 38 IIS in OFF State
It is necessary to wait a time tIS(OLOFF)_D between the falling edge of the input pin and the sensing at pin IS for
Open Load in OFF diagnosis to allow the internal comparator to settle. In Figure 39 the timings for an Open
Load detection are shown - the load is always disconnected.
Figure 39 Open Load in OFF Timings - load disconnected
Diagnosis_PROFET_IISOLOFF.emf
IIS
VDS
IIS(OLOFF)
VDS(OLOFF)
IIS(FAULT)
t
IN
t
DEN
VOUT
~ VS
tIS(OLOFF)_D
t
IIS(OLOFF)
IIS
IIS(OL)
VDS(OLOFF)
t
Diagnosis_PROFET_OLOFF_time.emf
Load
connected


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