PAH300
･
350S24
-SERIES
TDK-Lambda
7
●
Output Voltage Adjustment by external resistor
or by variable resistor
‘
(1) In case of adjusting output voltage lower
(1-1)
Available maximum output current = rated
output current
(1-2)
Connect an external resistor Radj(down)
between the TRM terminal and –S terminal.
Fig.2-2 Connection for output voltage trim down
(1-3)
Equation of external resistor and output
voltage.
[ ]
W
÷
ø
ö
ç
è
æ
-
D
=
k
down
Radj
2
%
%
100
)
(
Radj(down) :Value of external resistor
Δ(%)
:Output voltage change rate against
nominal output voltage
Below graph is relation Δ(%) and value of
external resistor.
Fig.2-3 Δ(%) vs. Radj(down) (1)
(2) In case of adjusting output voltage higher
(2-1) Allowable maximum output current =
maximum output power ÷ output voltage
(reduce
maximum
output
current
in
specification.)
(2-2) Connect an external resistor Radj(up) between
TRM terminal and +S terminal.
Fig.2-4 Connection for output voltage trim up
(2-3) Equation of external resistor and output voltage
[ ]
W
÷
ø
ö
ç
è
æ
D
D
´
+
-
D
´
D
+
=
k
Vo
up
Radj
%
%
2
%
100
%
225
.
1
%)
%
100
(
)
(
Vo
:nominal output value of module
Radj(up)
:external adjustment resistor
Δ (%)
:Output voltage change rate against
nominal output voltage
Below graph is relation Δ(%) and value of
external resistor.
Fig.2-5 Δ% vs.Radj(up) (2)
0.1
1
10
100
1000
0
10
20
30
40
Change in Output Voltage Δ（%)
R
ad
j
(d
o
w
n)
(
kΩ
)
10
100
1000
10000
0
10
20
Change in Output Voltage Δ（%)
R
ad
j
(u
p)
(
kΩ
)
12V
28V
+V
+S
TRM
-S
-V
Radj(up)
+
-
PAH200H
Series
Load
Power
module
+V
+S
TRM
-S
-V
Radj(down)
+
-
PAH200H
Series
Load
Power
module
