INM 5500 Rev 11
43
6 .4 .2
MTL5541A/MTL5541AS - Repeater Power Supply
Single channel, for 4/20mA, HART® for 2- or 3-wire transmitters
The MTL5541A provides an input for separately powered 4/20mA transmitters and also allows
bi–directional transmission of HART communication signals superimposed on the 4/20mA loop
current. Alternatively, the MTL5541AS acts as a current sink for a safe-area connection rather
than driving a current into the load.
Hazardous area
Safe area
Vs–
Vs+
20 to 35V dc
–
4/20mA
Load
+
–
+
MTL5541A
MTL5541AS
Load
+
–
–
+
4/20mA
6
5
4
3
2
1
7
8
9
10
11
12
13
14
I
I
Terminal
Function
1
Input –ve
2
Input +ve
11
Output –ve (+ve current sink)
12
ve (–ve current sink)
13
Supply –ve
14
ve
Figure 6 .21:
Top labels
for MTL5541A
& MTL5541AS
