BTS 640 S2
Figure 2a: Switching a lamp
Timing diagrams
IN
Figure 1a: Switching a resistive load,
change of load current in on-condition:
ST
IN
V
OUT
ST
t
don(ST)
t
doff(ST)
V
OUT
I
L
t
on
t
off
t
t
I
slc(IS)
slc(IS)
L
I
IS
t
Load 1
Load 2
I
IS
Figure 2b: Switching a lamp with current limit:
t
son(IS)
t
t
soff(IS)
The sense signal is not valid during settling time after turn or
change of load current.
IN
ST
Figure 1b: V turn on:
bb
IN
V
OUT
V
bb
I
I
L
I
L
IS
t
I
IS
ST
t
proper turn on under all conditions
Semiconductor Group
Page 11
2003-Oct-01