PK25-D5-D12 CUI Inc, PK25-D5-D12 Datasheet - Page 4

• Manufacturer Part Number: PK25-D5-D12
• Description: CONVERTER DC/DC +/-12V OUT 25.2W
• Manufacturer: CUI Inc
• Series: V-Infinity PK25r
• Type: Isolatedr

Specifications of PK25-D5-D12

• Output: ±12V
• Number Of Outputs: 2
• Power (watts): 25W
• Mounting Type: Through Hole
• Voltage - Input: 4.5 ~ 9V
• Package / Case: 7-DIP Module
• 1st Output: 12 VDC @ 850mA
• 2nd Output: -12 VDC @ 850mA
• Size / Dimension: 2.56" L x 2.00" W x 0.38" H (65mm x 50.8mm x 9.7mm)
• Power (watts) - Rated: 20.4W
• Operating Temperature: -20°C ~ 71°C
• Efficiency: 77%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• 3rd Output: -
• 4th Output: -
• Other names: 102-1606

PART NUMBER: PK25
APPLICATION NOTES
1. OUTPUT TRIMMING
The output voltages are preset to nominal values as indicated by the models table at the factory. If desired, the output voltage may
optionally be trimmed to a different value (+/- 10%) with external resistors and/or potentiometer as shown below.
To trim the output voltage with fixed resistors, the output voltage can be calculated as follows.
the unit and are defined in Table 1. For example to trim up
the PK25-D5-D12 up by 5% to 25.2 V, R
desired output voltage. R
Where: R
R
20050 SW 112
trim_up
V
o
R
= 25.2 / R
FIGURE 2: TRIM-UP VOLTAGE SETUP
trim_up
trim-up
FIGURE 1. TRIMMING WITH
EXTERNAL POTENTIOMETER
The value of R
=
+Vin
-Vin
is the external resistor in K Ω . V
2.43 · (25.2 - 2.5) - 2.5 · 21
1
th
=
= 21 KΩ / R
Ave. Tualatin, Oregon 97062
Trim-Up
2.5 · 21 · 2.43
as follows:
Table 1
R
trim-up
2
1
and R
Trim
· (V
+Vo
-Vo
V
2
is defined as:
o
r
= 2.43 KΩ / V
2
· R
- V
and V
1
r
) - V
· R
trim-up
r
2
are internal to
R trim-up
r
Model
PK25-DXX-S3.3
PK25-DXX-S5
PK25-DXX-S12
PK25-DXX-S15
PK25-DXX-D5
PK25-DXX-D12
PK25-DXX-D15
*PK25-D5-S3.3
=
· R
is calculated
r
47.94 KΩ
+Vin
-Vin
= 2.5
1
o
is the
phone
phone [phone] fax
R load
R1 (KΩ)
0.787
4.12
2.43
9.31
12.7
26.7
Trim
7.5
+Vo
21
DESCRIPTION: dc-dc converter
-Vo
the PK25-D5-D12 down by 5% to 22.8 V, R
the unit and are defined in Table 1. For example to trim down
R
Where: R
desired output voltage. R
R2 (KΩ)
trim_down
2.49
2.43
2.43
2.49
2.49
2.43
2.43
2.43
V
R
o
FIGURE 3: TRIM-DOWN VOLTAGE SETUP
trim_down
= 22.8 / R
10K
Trimpot
Vr (V)
trim-down
1.25
2.5
2.5
2.5
2.5
2.5
2.5
2.5
The value of R
fax [phone]
=
+Vin
-Vin
2.5 - 2.1 (22.8 - 2.5) · 2.43
is the external resistor in K Ω . V
1
(22.8 - 2.5) · 21 · 2.43
= 21 KΩ / R
Trim-Down
=
R load
as follows:
trim-down
V
1
Trim
r
+Vo
(V
and R
-Vo
· R
o
2
1
- V
= 2.43 KΩ / V
is defined as:
2
www.v-infinity.com
- (V
and V
r
) · R
o
trim-down
rev.
page
date
- V
r
1
R trim-down
are internal to
· R
r
=
) · R
r
2
326.68 KΩ
11/2009
= 2.5
4 of 5
is calculated
2
o
is the
R load