PTK25-D48-T512 CUI Inc, PTK25-D48-T512 Datasheet - Page 4

• Manufacturer Part Number: PTK25-D48-T512
• Description: CONVERTER DC/DC 5V +/-12V OUT
• Manufacturer: CUI Inc
• Series: V-Infinity PTK25r
• Type: Isolatedr

Specifications of PTK25-D48-T512

• Output: 5V, ±12V
• Number Of Outputs: 3
• Power (watts): 25W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 72V
• Package / Case: 8-DIP Module (7 Leads)
• 1st Output: 5 VDC @ 3.5A
• 2nd Output: 12 VDC @ 350mA
• 3rd Output: -12 VDC @ 350mA
• Size / Dimension: 2.00" L x 2.00" W x 0.40" H (50.8mm x 50.8mm x 10.2mm)
• Power (watts) - Rated: 25.9W
• Operating Temperature: -20°C ~ 71°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• 4th Output: -
• Other names: 102-1109

PART NUMBER: PTK25
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 PTK25-D5-D12 up by 5% to 25.2 V, R
the unit and are defined in Table 1. For example to trim up
desired output voltage. R
Where: R
R
trim_up
V
20050 SW 112
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
=
= 21 KΩ / R
th
Trim-Up
2.5 · 21 · 2.43
as follows:
Table 1
R
Ave. Tualatin, Oregon 97062
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
Model
PTK25-DXX-S3.3
PTK25-DXX-S5
PTK25-DXX-S12
PTK25-DXX-S15
PTK25-DXX-D5
PTK25-DXX-D12
PTK25-DXX-D15
r
2
are internal to
R trim-up
r
=
· R
is calculated
r
47.94 KΩ
+Vin
-Vin
= 2.5
1
o
is the
R load
phone
phone [phone] fax
R1 (KΩ)
1.13
2.43
9.31
12.1
7.32
26.7
Trim
+Vo
21
DESCRIPTION: dc-dc converter
-Vo
the PTK25-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
0.68
2.43
2.43
2.43
2.43
2.43
2.4
V
R
o
FIGURE 3: TRIM-DOWN VOLTAGE SETUP
trim_down
= 22.8 / R
10K
Trimpot
trim-down
The value of R
Vr (V)
1.25
=
2.5
2.5
2.5
2.5
2.5
2.5
+Vin
-Vin
fax [phone]
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
- (V
and V
r
) · R
o
rev.
page
date
- V
trim-down
r
1
R trim-down
are internal to
· R
r
=
) · R
r
2
326.68 KΩ
06/2009
= 2.5
4 of 4
is calculated
2
o
is the
R load