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VHK75W-Q48-S5 Datasheet(PDF) 6 Page - CUI INC |
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VHK75W-Q48-S5 Datasheet(HTML) 6 Page - CUI INC |
6 / 9 page page date DESCRIPTION: chassis mount dc-dc converter 6 of 9 08/2009 20050 SW 112th Ave. Tualatin, Oregon 97062 phone phone 503.612.2300 fax www.v-infinity.com fax 503.612.2383 PART NUMBER: VHK75W 9. OUTPUT TRIMMING (OPTIONAL) 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 4: TRIM-UP VOLTAGE SETUP FIGURE 5: 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,nom is the Where: Rtrim-down is the external resistor in KΩ. Vo,nom is the nominal output voltage. Vo is the desired output voltage. nominal output voltage. Vo is the desired output voltage. R1 and R2 are internal to the unit and are defined in Table 1. R1 and R2 are internal to the unit and are defined in Table 2. For example, to trim-up the output voltage of 5.0V module For example, to trim-down the output voltage of 5.0V module (VHK75W-Q48-S5) by 8% to 5.4V, Rtrim-up is calculated (VHK75W-Q48-S5) by 8% to 4.6V, Rtrim-down is calculated as follows: as follows: R load 10K Ω Trimpot +Vin -Vin -Vo -S Trim +S +Vo R load R trim-up +Vin -Vin +Vo +S Trim -S -Vo R load R trim-down +Vin -Vin +Vo +S Trim -S -Vo FIGURE 3. TRIMMING WITH EXTERNAL POTENTIOMETER R2 = 8.2 KΩ R1 = 5.8 KΩ o o, nom = 5.4 - 5.0 = 0.4 V V - V = = 6.3 (KΩ) R 0.4 trim-up 5.8 - 8.2 x 0.4 V - V = = 3.98 (KΩ) R 0.4 trim-down 5.8 - 10.52 x 0.4 R2 = 10.52 KΩ R1 = 5.8 KΩ o o, nom = 5.0 - 4.6 = 0.4 V = (KΩ) R o o, nom V - V o o, nom trim-up R1 - R2 x (V - V ) = (KΩ) R o o, nom V - V o o, nom trim-down R1 - R2 x (V - V ) 16.67 14.76 13.304 8.2 7.2 Ω Ω 42.33 25.474 19.656 5.8 3.168 24V 15V 12V 5V 3.3V Table 1 120 94 60.1 10.52 15 Ω Ω 430 150 86.45 5.8 6.18 24V 15V 12V 5V 3.3V Table 2 |
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