3.5.2.2 Source Driver
Each input port is equipped with two source driver chips of type
ISO1H811G; detailed specifications see page 38.
The source output drivers are short-circuit-proof and are equipped
with a current limiting per channel. The combination of current lim-
iting, thermal shutdown, and automatic restart protects the cir-
cuitry against overload.
In the case of an overload condition (T
TSD
= typ. 175
°
C) the related
channel will switch off and on again automatically, as soon as the
junction temperature has fallen below the threshold of T
R
=
135 ºC. If a chip temperature of typ. 130 ºC is still exceeded, the
overloaded channel remains disabled and is only reactivated, if the
temperature decreases below T
CR
= 110 ºC. Channels in standard
(no overload) condition can be used at any time without re-
strictions. In the case of an overload condition the output driver
(per port) can send an interrupt to the PC. A further security fea-
ture is a complete disabling of a port in case of a missing ground
connection.
The following table shows the maximum output current I
Out
in de-
pendency of the number of channels in use.
Number Of Channels Used 1
16
32
I
OUT
[A]
0.625 A
0.370 A
0.180 A
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