bts3405 Infineon Technologies Corporation, bts3405 Datasheet - Page 17

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

6.3
The condition short circuit is an overload condition of the device. If the current reaches the value of
starts to limit the current. In the condition of current limitation the device heats up. If the thermal shutdown
temperature is reached the device turns off.
current is above
Figure 15
As the device is a low side switch it can be assumed that the Source to Ground path has a neglectable low
impedance and resistance. Therefore all impedance and resistance in the load path during short circuit is merged
into Zsc.
Data Sheet
V
I
T
I
I
lim
IN lim
IN n o m
JSD
b b
5V
0
I
/Z
I
0
Short Circuit Protection
Short Circuit Behavior of BTS3405G
IN
T
D
IN
sc
J
I
INnom
. During the time period
∆T
JSD
Occurrence of Over current
or high ohmic Short circuit
Turn off due to over temperature
t
d lim
Figure 15
t
Restart after short circuit turn off
dlim
, the current can be above
shows this behavior. During the current limitation the input
17
Restart into normal load condition
Protection FunctionsShort Circuit Protection
Smart Low-Side Power Switch
I
lim
.
t
t
t
t
Short_circuit.emf
Rev. 1.0, 2007-12-06
BTS3405G
I
lim
the device