TDK-Lambda PH Series, Manual, Page: 36 / 58

PH
50
-
150, 75
-
300F
PH
B-334
・All specifications are subject to change without notice.
Recommended Capacitor Values:
24VDC Input: 470μF
48VDC Input
: 100
-
470μF
110VDC Input : 220
-
470μF
280VDC Input : 10
-
47μF
Fuse Switch L1
＋
C1b
＋ ＋
C4
C1a
＋Vin
−Vin
Fuse L1
＋
C1b
＋Vin
−Vin
Fuse Switch L1
＋
C1b
＋ ＋
C4
C1a
＋Vin
−Vin
＋
C1a
Figure1-4: Input Filter with Input Switch
Fuse Switch L1
＋
C1b
＋ ＋
C4
C1a
＋Vin
−Vin
Fuse L1
＋
C1b
＋Vin
−Vin
Fuse Switch L1
＋
C1b
＋ ＋
C4
C1a
＋Vin
−Vin
＋
C1a
Figure1-5 : Input Filter when several power
modules are connected
Reversed Connection of Input
Reverse (-, + electrodes) connection of the input may
cause damage to the power module. Whenever there is
a possibility for a reverse input connection, attach a pro-
tective diode and an input fuse. The rated voltage of the
protective diode shall be higher than input voltage, and the
maximum in-rush current shall be higher than external fuse
rating.
＋Vin
−Vin
＋V
−V
Fuse
Load
Figure1-5: Protection for Reversed Connection of Input
2 - 1 OUTPUT VOLTAGE RANGE 〈S type〉
Output voltage can be adjusted within ±10% of the nomi-
nal voltage by adjusting the external trimmer (variable resis-
tor). However, note that OVP (Over Voltage Protection) will
be activated when the output voltage is raised over specifi-
cation range.
Furthermore, when the output voltage is adjusted to high,
the output current shall be derated to a value that is pre-
scribed by the maximum output power. Also, when output
voltage is adjusted to high, there is a limitation on the input
voltage range for each model as shown in Figure2-1.
Values and connection methods of external resistors and
variable resistor (VR) are shown as follows.
0
18
20 22 24 26
90
100
110
Input Voltage (VDC)
＜２４VDC Input＞
0
35
40 45 50 55
90
100
110
Input Voltage (VDC)
＜４８VDC Input＞
0
80
90 100 110 120
90
100
110
Input Voltage (VDC)
＜１１０VDC Input＞
0 200 220 240 260 280
90
100
110
Input Voltage (VDC)
＜２８０VDC Input＞
Output Voltage (%)
Output Voltage (%)
Output Voltage (%)
Output Voltage (%)
Figure2-1 : Limitation of Input Voltage Range
〈Example1, 2: Values and Methods of Resistor and vari-
able Resistor Networks〉
3V
4.7k
1.3k
10k
5V
3.9k
1.8k
10k
12V
3.9k
680
1k
15V
5.6k
750
1k
24V
10k
820
1k
28V
12k
820
1k
R1
R2
VR
R1, R2: ±5% Tolerance
VR:
±20% Total Tolerance below 1% End Resistanced
Table2-1: Values for External Resistor and Variable
Resistor of connection
example 1 and 2
(Vo (typ)±10% adjastable)