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BTS7040-2EPA Arkusz danych(PDF) 35 Page - Infineon Technologies AG

Numer części BTS7040-2EPA
Szczegółowy opis  Smart High-Side Power Switch
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Producent  INFINEON [Infineon Technologies AG]
Strona internetowa  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

BTS7040-2EPA Arkusz danych(HTML) 35 Page - Infineon Technologies AG

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Data Sheet
35
Rev. 1.00
2017-08-24
BTS7040-2EPA
PROFETTM+2
Protection
It is possible to “force” a reset of the internal counter without waiting for tDELAY(CR) by applying a pulse (rising
edge followed by a falling edge) to the DEN pin while IN pin is “low”. The pulse applied to DEN pin must have
a duration longer than tDEN(CR) to ensure a reset of the internal counter. The DSEL pin must select the channel
that has to be de-latched and keep the same logic value while DEN pin toggles twice (rising edge followed by
a falling edge).
The timings are shown in Figure 30.
Figure 30 Retry Strategy Timing Diagram with Forced Reset
8.4
Additional protections
8.4.1
Reverse Polarity Protection
In Reverse Polarity condition (also known as Reverse Battery), the output stages are switched ON (see
parameter RDS(REV)) because of ReverSave™ feature which limits the power dissipation in the output stages.
Each ESD diode of the logic contributes to total power dissipation. The reverse current through the output
stages must be limited by the connected loads. The current through digital input pins has to be limited as well
by an external resistor (please refer to the Absolute Maximum Ratings listed in Chapter 4.1 and to Application
Information in Chapter 10).
Figure 31 shows a typical application including a device with ReverSave™. A current flowing into GND pin (-
IGND) during Reverse Polarity condition is necessary to activate ReverSave™, therefore a resistive path between
module ground and device GND pin must be present.
t
IN
Short circu it
to ground
IL
0
1
Internal
counter
nRETRY(CR)
t
t
t
Protection_PROFET_DENforce_time2.emf
DEN
nRETRY(CR)
1
t
tDEN(CR)
0
tDEN(CR)
nRETRY(CR)
tDEN(CR)
nRETRY(CR)
0


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