6
TDK-Lambda
HWS
30A-150A/ME
Series
INSTRUCTION MANUAL
4-6. Remote Sensing (+S, –S terminal)
(For HWS100A/ME, HWS150A/ME)
This function compensates voltage drop of wiring from output terminals to load terminals. Connect “+S” terminal to “+”
terminal of load and “
–
S” terminal to “
–
” terminal of load with sensing wires.
The total line voltage drop (+ side line and - side line) shall be less than 0.3V.
In case that sensing line is too long, it is necessary to put an electrolytic capacitor in following 3 placed;
1)
Across the load terminal,
2)
Between “+S” terminal and “+V” terminal,
3)
Between “
–
S” terminal and “
–
V” terminal.
If remote sensing terminals are opened, the output will rise and OVP may be triggered.
4-7. Output Ripple & Noise
The standard specification for maximum ripple value is measured according to measurement circuit specified by JEITA
RC-9131B. When load lines are longer, ripple will becomes larger. In this case, electrolytic capacitor, film capacitor, etc.
might be necessary to use across the load terminal.
The output ripple cannot be measure accurately if the probe ground lead of oscilloscope is too long.
+V
-V
Power
Supply
Coaxial Cable
1.5m 50
W
Oscilloscope
Load
R:50
W
C:4700pF
100MHz
R
C
Power
Supply
+S
+V
-V
-S
+
-
Load
+
+
+
