4.3 Output voltage adjustment by external voltage
■
■
Overvoltage protection will be activated if output voltage is adjusted over the certain level.
■
During startup , VTRM should be applied before input voltage.
■
Fig.4
.4
(1) Output voltage
12V
Vo = -1.526×V
TRM
+ 15.91
(2) Output voltage
28V
Vo = -3.367×V
TRM
+ 36.44
(3) Output voltage
48V
Vo = -6.010×V
TRM
+ 63.09
Please use low impedance for VTRM as current will flow through TRM terminal.
Output voltage
adjustment by
external voltage
＜
V
TRM
→
Output voltage Calculating formula
＞
A-12
The output voltage can be adjustable by applying voltage between the TRM terminal and -S
terminal.
-VOUT
+VOUT
+S
TRM
-S
V
TRM
TUNS
External
voltage source
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
0.0
1.0
2.0
3.0
4.0
5.0
O
ut
pu
t v
ol
ta
ge
V
o
[V
]
VTRM [V]
Output voltage 12V
18.0
20.0
22.0
24.0
26.0
28.0
30.0
32.0
34.0
36.0
38.0
0.0
1.0
2.0
3.0
4.0
5.0
O
ut
pu
t v
ol
ta
ge
V
o
[V
]
VTRM [V]
Output voltage 28V
+20%
+20%
+20%
-20%
-20%
-20%
+10%
Applications Manual
TUNS300/500/700
