4.1 Output voltage adjustment
■
The output voltage is adjustable in the output voltage variable range (Table 4.1).
■
Overvoltage protection may be activated if output voltage is set up over the certain level.
■
■
About -Y1 options (48V output only)
1)
2)
3) Boost terminal (BC terminal) voltage will be changed to DC390Vtyp.
Table 4.1
4.2 Output voltage adjustment by potentiometer
■
The output voltage is adjustable by external potentiometer as shown in Fig.4.1.
■
■
Fig.4.1
Table 4.2
A-10
0.15
VR[kΩ]
5
5
5
5
±20%
R1[kΩ]
3.3
12
27
27
R2[kΩ]
0.15
0.15
0.15
1
VR[kΩ]
5
5
5
5
±10%
R1[kΩ]
6.8
27
47
47
R2[kΩ]
1
1
1
2.2
2.2
2.2
VR[kΩ]
5
5
5
5
Standard Option
：
-Y1
±5%
R1[kΩ]
12
39
68
68
R2[kΩ]
2.2
When the output voltage is increased, the maximum output current must be reduced not to
exceed the rated power. When the output voltage is reduced, the maximum output current must
be kept within its rated current.
The potentiometer(VR) and resistor (R1, R2) might not meet requirements of fluctuation
characteristics of ambient temperature; therefore, cermet type potentiometer
(
≦
±300ppm/
℃
) and metallic film resistor (
≦
±100ppm/
℃
) are recommended.
Connection devices
outside the
power supply
Output voltage
12V
28V
48V
Output voltage
adjustment
Recommended
component values
Standard Standard
（
115
～
135%
）
（125%～140%）
Boost terminal
voltage
DC380Vtyp DC380Vtyp DC380Vtyp
DC390Vtyp
（80%～120%） （80%～110%）
（80%～120%）
Overvoltage protection
operation value
15.0～16.8V 35.0～39.2V 55.2～64.8V
60.0
～
67.2V
（
125
～
140%
） （
125
～
140%
）
Standard Standard Standard Option
：
-Y1
Output voltage
variable range
9.6～14.4V
22.4～33.6V 38.4～52.8V
38.4
～
57.6V
（80%～120%）
Variable range upper limit in the standard of 48V output is 52.8V (rated v 10%). Please
use the option -Y1 if up to +20% output voltage adjustment is necessary.
On the safety standards, the output of the options -Y1 are treated with the ELV. The
manufacturer must provide protection against inadvertent contact to the operator.
Overvoltage protection operation value will be changed to the value shown in
Table 3.1.
Output voltage
12V
28V
48V
Output voltage
variable range
-VOUT
+VOUT
VR
5kΩ
+S
TRM
-S
R1
R2
TUNS
LOAD
2.1 Pin configuration
4. Output voltage adjustment
Applications Manual
TUNS300/500/700
