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PK25-D48-D12 Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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PK25-D48-D12 Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers |
4 / 5 page rev. page date 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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