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PK25-D48-D12 Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers

Part # PK25-D48-D12
Description  dc-dc converter
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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PK25-D48-D12 Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers

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DESCRIPTION: dc-dc converter
4 of 5
11/2009
20050
SW 112th Ave. Tualatin, Oregon 97062
phone
phone 503.612.2300 fax
www.v-infinity.com
fax 503.612.2383
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.
Trim-Up
Trim-Down
FIGURE 2: TRIM-UP VOLTAGE SETUP
FIGURE 3: TRIM-DOWN VOLTAGE SETUP
The value of Rtrim-up is defined as:
The value of Rtrim-down is defined as:
Where: Rtrim-up is the external resistor in KΩ. Vo is the
Where: Rtrim-down is the external resistor in KΩ. Vo is the
desired output voltage. R1 and R2 and Vr are internal to
desired output voltage. R1 and R2 and Vr are internal to
the unit and are defined in Table 1. For example to trim up
the unit and are defined in Table 1. For example to trim down
the PK25-D5-D12 up by 5% to 25.2 V, Rtrim-up is calculated
the PK25-D5-D12 down by 5% to 22.8 V, Rtrim-down is calculated
as follows:
as follows:
R load
10KW
Trimpot
+Vin
-Vin
-Vo
Trim
+Vo
FIGURE 1. TRIMMING WITH
EXTERNAL POTENTIOMETER
2.5
2.5
2.5
2.5
2.5
2.5
2.5
1.25
Vr (V)
2.43
2.43
2.43
2.49
2.49
2.43
2.43
2.49
R2 (K
Ω)
Model
*PK25-D5-S3.3
PK25-DXX-D15
PK25-DXX-D12
PK25-DXX-D5
PK25-DXX-S15
PK25-DXX-S12
PK25-DXX-S5
PK25-DXX-S3.3
0.787
26.7
21
7.5
12.7
9.31
2.43
4.12
R1 (K
Ω)
Table 1
R load
R trim-up
+Vin
-Vin
+Vo
Trim
-Vo
R load
R trim-down
+Vin
-Vin
+Vo
Trim
-Vo
Vo = 25.2 / R1 = 21 KΩ / R2 = 2.43 KΩ / Vr = 2.5
=
=
Rtrim_up
47.94 KΩ
2.43 · (25.2 - 2.5) - 2.5 · 21
2.5 · 21 · 2.43
Vo = 22.8 / R1 = 21 KΩ / R2 = 2.43 KΩ / Vr = 2.5
=
=
Rtrim_down
326.68 KΩ
2.5 - 2.1 (22.8 - 2.5) · 2.43
(22.8 - 2.5) · 21 · 2.43
=
Rtrim_up
R2 · (Vo - Vr) - Vr · R1
Vr · R1 · R2
=
Rtrim_down
Vr · R1 - (Vo - Vr) · R2
(Vo - Vr) · R1 · R2


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