BTS3256D Datasheet, PDF (22/30 Pages) Infineon Technologies AG – 10 mΩ smart power single channel low side switch with restart and variable slew rate

Smart Low Side Power Switch
HITFET - BTS 3256D
Protection Functions
8
Protection Functions
The device provides embedded protection functions against over temperature, over load and short circuit.
Note: Integrated protection functions are designed to prevent IC destruction under fault conditions described in the
data sheet. Fault conditions are considered as “outside” normal operation.
8.1
Thermal Protection
The device is protected against over temperature resulting from overload and / or bad cooling conditions.
The BTS 3256D has a thermal restart function. When overheating occurs, the device switches off for the restart
delay time t_restart. After this time the device restarts if the temperature is below threshold and the IN has logic high
level. The fault feedback is activated during over temperature situation. See Figure 16 for the restart behavior.
The diagram naming refers to Figure 14.
IN
High
Low
TJ
T_{J SD}
∆TJ SD
Thermal shutdown
After delay time , IN is high
Over temperature is gone
Don’t care
t
IIN
IIN fa u lt
IIN n o m
0
VDI
high
low
tr es tar t
Figure 16 Status Feedback via Input Current at Over temperature
t
t
t
therma_l fault_autorestart.emf
8.2
Over Voltage Protection
The BTS 3256D is equipped with a voltage clamp mechanism that keeps the Drain-Source voltage V_D at a certain
level. This stage is also used for inductive clamping.
See “Inductive Output Clamp” on Page 14 for details.
Datasheet
22
Rev. 1.0, 2009-05-05