bts3405 Infineon Technologies Corporation, bts3405 Datasheet - Page 15

• Manufacturer Part Number: bts3405
• Description: Smart Low-side Power Switch Hitfet
• Manufacturer: Infineon Technologies Corporation

6
The device provides embedded protection functions. 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.
6.1
The device is protected against over temperature due to overload and / or bad cooling conditions. To ensure this
a temperature sensor located in the Power MOSFET is used.
The BTS3405G has a thermal auto-restart function. After the device has cooled down it will switch on again see
Figure
Figure 12
6.2
When switching off inductive loads with low-side switches, the Drain-Source voltage
potential, because the inductance intends to continue driving the current.
Figure 13
The BTS3405G is equipped with a voltage clamp mechanism that keeps the Drain-Source voltage
level. See
Data Sheet
12.
Figure 13
Protection Functions
Thermal Protection
Error Signal via Input Current at Thermal Shutdown
Overvoltage Protection
Output Clamp
5V
0
T
I
I
INf
IS
JSD
I
0
IN
T
IN
J
and
∆T
Figure 14
JSD
for more details.
Thermal shutdown
restart
Drain
Source
15
Protection FunctionsThermal Protection
OutputClamap.emf
Smart Low-Side Power Switch
Thermal_fault_autorestart.emf
V
D
Rev. 1.0, 2007-12-06
rises above battery
t
t
t
V
BTS3405G
D
at a certain