BTS725L1 Siemens Semiconductor Group, BTS725L1 Datasheet - Page 11

• Manufacturer Part Number: BTS725L1
• Description: Smart Two Channel Highside Power Switch (Overload protection Current limitation Short-circuit protection Thermal shutdown)
• Manufacturer: Siemens Semiconductor Group

Timing diagrams
Both channels are symmetric and consequently the diagrams are valid for channel 1 and
channel 2
Figure 1a: V
Figure 2a: Switching a lamp:
Semiconductor Group
The initial peak current should be limited by the lamp and not by
the initial short circuit current I
V
V
ST
IN2
V
IN
V
I
IN1
ST open drain
L
OUT1
OUT
OUT2
bb
bb
turn on:
L(SCp)
= 28 A typ. of the device.
t
t
11
Figure 3a: Turn on into short circuit:
shut down by overtemperature, restart by cooling
Heating up of the chip may require several milliseconds, depending
on external conditions (t off(SC) vs. T j,start see page 10)
Figure 3b: Turn on into short circuit:
shut down by overtemperature, restart by cooling
(two parallel switched channels 1 and 2)
ST1 and ST2 have to be configured as a 'Wired OR' function
ST1/2 with a single pull-up resistor.
ST1/2
IN1
I
ST
IN1/2
I
L1
L1
+ I
t off(SC)
t
I
L2
I L(SCp)
off(SC)
L(SCp)
other channel: normal operation
Preliminary BTS 725 L1
I
L(SCr)
I
L(SCr)
t
t