BTS5090-2EKA Datasheet, PDF (21/54 Pages) Infineon Technologies AG – Smart High-Side Power Switch

BTS5090-2EKA
Protection Functions
6
Protection Functions
The device provides integrated protection functions. These functions are designed to prevent the destruction of
the IC from fault conditions described in the data sheet. Fault conditions are considered as “outside” normal
operating range. Protection functions are designed for neither continuous nor repetitive operation.
6.1
Loss of Ground Protection
In case of loss of the module ground and the load remains connected to ground, the device protects itself by
automatically turning OFF (when it was previously ON) or remains OFF, regardless of the voltage applied on IN
pins.
In case of loss of device ground, it’s recommended to use input resistors between the microcontroller and the
BTS5090-2EKA to ensure switching OFF of channels.
In case of loss of module or device ground, a current (I_OUT(GND)) can flow out of the DMOS. Figure 14 sketches
the situation.
Z_GND can be either resistor or diode.
RSENSE
RDSEL
RDEN
RIN
IS
DSEL
DEN
INx
ZDESD
RIS
ZIS(AZ)
VS
ZD(AZ)
ZDS(AZ)
VBAT
LOGIC
GND
ZGND
I_OUT(GND)
OUTx
Loss of ground protection.svg
Figure 14 Loss of Ground Protection with External Components
6.2
Undervoltage Protection
Between V_S(UV) and V_S(OP), the undervoltage mechanism is triggered. V_S(OP) represents the minimum voltage
where the switching ON and OFF can takes place. V_S(UV) represents the minimum voltage the switch can hold ON.
If the supply voltage is below the undervoltage mechanism V_S(UV), the device is OFF (turns OFF). As soon as the
supply voltage is above the undervoltage mechanism V_S(OP), then the device can be switched ON. When the switch
is ON, protection functions are operational. Nevertheless, the diagnosis is not guaranteed until V_S is in the V_NOM
range. Figure 15 sketches the undervoltage mechanism.
Data Sheet
PROFET™+ 12V
21
Rev. 2.0, 2010-08-02