BTS 733 L1
Timing diagrams
Both channels are symmetric and consequently the diagrams are valid for channel 1 and
channel 2
Figure 1a: Vbb turn on:
IN1
IN2
Figure 2b: Switching a lamp:
IN
V bb
ST
V
OUT1
V
OUT
V
OUT2
ST open drain
Figure 2a: Switching a resistive load,
turn-on/off time and slew rate definition:
IN
I
L
t
t
The initial peak current should be limited by the lamp and not by
the initial short circuit current IL(SCp) = 53 A typ. of the device.
Figure 3a: Turn on into short circuit:
shut down by overtemperature, restart by cooling
IN1 other channel: normal operation
VOUT
90%
t on
10%
dV/dton
IL
dV/dtoff
t off
I
L1
I L(SCp)
I L(SCr)
t off(SC)
ST
t
t
Heating up of the chip may require several milliseconds, depending
on external conditions (toff(SC) vs. Tj,start see page 10)
Semiconductor Group
11