BTS6142D_07 Datasheet, PDF (19/30 Pages) Infineon Technologies AG – Smart High-Side Power Switch

Smart High-Side Power Switch
BTS 6142D
Protection Functions
I_Rbb
R_{bb Vbb}
-V_bb
Figure 14
R_IN
IN
IS
-I_IN
-I_IS
D R_IS
signal ground
Reverse battery protection
-I_L
power ground
Reverse.emf
Additional power is dissipated by the integrated R_bb resistor. Use following formula for
estimation of overall power dissipation P_diss(rev) in reverse polarity mode.
P_diss(rev) ≈ R_ON(rev) ⋅ I_L2 + R_bb ⋅ I_{R2 bb}
For reverse battery voltages up to V_bb <16V the pin IN or the pin IS should be low ohmic
connected to signal ground. This can be achieved e.g. by using a small signal diode D
in parallel to the input switch or by using a small signal MOSFET driver. For reverse
battery voltages higher then V_bb >16V an additional resistor R_IN is recommended. For
reverse battery voltages higher then V_bb >16 the overall current through R_bb should be
about 80mA.
----¹----- + ----¹---- = -------⁰----^,-⁰----⁸---^A----------
R_IN R_IS ^V_bb ^{– 12V}
Note: No protection mechanism is active during reverse polarity. The IC logic is not
functional.
Data Sheet
19
V1.1, 2007-02-28