CURRENT SWITCHING AMPLIFIER
12
CEDRAT TECHNOLOGIES
Current Switching Amplifier
18/12/2017
Figure 2. Internal schematic of the Control Port.
Pin
Signal
I/O
Isolation
Type
Function
1
Input
Yes
Digital
Positive (Anode) of the enable optocoupler.
6
Enable-
Input
Yes
Digital
Negative (Cathode) of the enable optocoupler.
2
Fault+
Output
Yes
Digital
Collector of the fault optocoupler.
7
Fault-
Output
Yes
Digital
Emitter of the fault optocoupler.
3
GND
No
8
I
meas
Output
No
Analog
Output current sensing (offset = 2.5V,
sensitivity : 56mV/A)
4
In+
Input
No
Analog
Positive order input.
(±10V)
9
In-
Input
No
Analog
Negative order input.
(±10V)
5
GND
No
Table 2. Control port pin assignements.
Note: Isolated signals can withstand 200Vrms from ground. Non-isolated signals are referenced to GND.
The order is differential to increase immunity against common mode noise.
𝑂𝑟𝑑𝑒𝑟 = 𝐼𝑛
+
− 𝐼𝑛
−
1
2
3
4
5
6
7
8
9
330R
33R
15V
Fault
Enable
Enable-
Fault+
Fault-
Imes
Imes
10k
5V
10k
10k
10k
10k
In+
In-
In+
In-
15V
15V
User Port
Reserved (Do Not Connect)
GND
