BTS5234L Datasheet, PDF (21/28 Pages) Infineon Technologies AG – Smart High-Side Power Switch PROFET TWO CHANNELS, 60MOHM

Smart High-Side Power Switch
BTS 5234L
For open load diagnosis in off state an external output pull-up resistor (R_OL) is
recommended. For calculation of the pull-up resistor, just the external leakage current
I_leakage and the open load threshold voltage V_OUT(OL) has to be taken into account.
R_OL
=
V_{-----b--b---(-m----i-n---)---–-----}V_{----O----U---T---(-O----L---,-m----a--x---)}
I_leakage
I_leakage defines the leakage current in the complete system e.g. caused by humidity.
There is no internal leakage current from out to ground at BTS 5234L. V_bb(min) is the
minimum supply voltage at which the open load diagnosis in off state must be ensured.
To reduce the stand-by current of the system, an open load resistor switch (S_OL) is
recommended.
4.3.3 Sense Enable Function
The diagnosis signals have to be switched on by a high signal at sense enable pin (SEN).
See Figure 17 for details on the timing between SEN pin and diagnosis signal I_IS.
Please note that the diagnosis is disabled, when no signal is provided at pin SEN.
SEN
I_IS
t_sIS(SEN)
t_dIS(SEN)
t_sIS(SEN)
t_dIS(SEN)
t
Figure 17 Timing of Sense Enable Signal
t
SEN.emf
The SEN pin circuit is designed equal to the input pin. Please refer to Figure 5 for details.
The resistors R_lim are recommended to limit the current through the sense pins IS1 and
IS2 in case of reverse polarity and over voltage. Please refer to maximum ratings on
Page 8.
The stand-by current of the BTS 5234L is minimized, when both input pins (IN1 and IN2)
and the sense enable pin (SEN) are on low level.
Data Sheet
21
V1.0, 2004-01-23