3.3.2.2 Source Driver
Each input port is equipped with two source driver chips of type
ISO2H811G; detailed specifications see page 29.
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 re-start 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 auto-
matically, as soon as the junction temperature has fallen below the
threshold of T
R
= 135 °C). If a chip temperature of typ. 130 °C is
still exceeded, the overloaded channel remains disabled and is only
reactivated, if the temperature decreases below T
CR
= 110 °C.
Channels in standard (no overload) condition can be used at any
time without restrictions. In the case of an overload condition the
output driver (per port) can send an interrupt to the PC. A further
security feature is a complete disabling of a port in case of a miss-
ing 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
I
Out
[A]
0.625
A
0.5
A
Summary of Contents for ME-5004
Page 12: ......
