Reverse Polarity Protection Diode for LITIX™ Basic and Basic+ Designs?
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The main difference between the two devices is in the input types:
a) TLE7181EM uses the PWM/DIR interface and DRVDIS to disable all 4 MOSFETs: only two pins are needed and shoot-through event cannot happen by design.
https://www.infineon.com/cms/en/about-infineon/company/contacts/support/images/PWM_DIR_interface_nor... PWM/DIR interface nornal operation
b) on the other hand, TLE7182EM provides 4 independent control inputs to control the MOSFETs individually: the high-side MOSFET inputs are inverted to eventually simplify the connection wiring. Shoot-through events can be avoided if the short-circuit protection is activated by generating a minimum dead time by SCDL pin. TLE7182 offers the possibility to drive 4 low-side MOSFETs as well.
https://www.infineon.com/cms/en/about-infineon/company/contacts/support/images/truth_table.png Truth table
LITIX™ Basic and Basic+ devices are reverse polarity protected:
* LITIX™ Basic down to -16V
* LITIX™ Basic+ down to -18V
This means that if there is a *static pulse* higher than -18V and no external reverse polarity diode, the device could be destroyed.
For *transient* pulses a TVS diode, reverse polarity diode and ceramic capacitor are recommended, unless the surge pulses are filtered using system-level measures.
See the corresponding datasheets https://www.infineon.com/cms/en/product/power/lighting-ics/litix-automotive-led-driver-ic/litix-basi... here.