Function groups 19
Manual ADQ-22/23-Serie Rev. 1.1
Function groups
The output stage offers comprehensive overload protection, including:
• Short-circuit-proof outputs (current limitation per channel)
• Switch-off at current peaks of typ. 1.4 A, e.g. with inductive loads
• Overvoltage protection for VEXT_DO > 47 V
• Undervoltage cut-off: VEXT_DO = min. 7 V/max. 10.5 V, restart at max. 11 V,
hysteresis: typ. 0.5 V
• Thermal overload protection with automatic restart. In case of overload (TTSD = typ.
135°C) the respective channel switches off and switches on again automatically as soon
as the junction temperature has dropped by 10°K. In the event of an overload, the driver
module (per port) can send an interrupt to the PC.
To supply the output stage, an external voltage source that can provide sufficient power must
be connected to the VEXT_DO pins. At full load, this is up to 19.2 A for the ADQ-22 and up to
9.6 A for the ADQ-23. Therefore, connect all Vext and GNDext pins as well.
Attention: the 78-pin sub-D connector (ST1) can heat up!
Fig. 9: Wiring of the isolated digital outputs
