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VHB150W-Q48-S15 Datasheet(PDF) 6 Page - CUI INC |
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VHB150W-Q48-S15 Datasheet(HTML) 6 Page - CUI INC |
6 / 9 page 7. 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 R trim-up is defined as: The value of R trim-down is defined as: Where: R trim-up is the external resistor in KΩ. Vo,nom is Where: R trim-down is the external resistor in KΩ. Vo,nom is the nominal output voltage. Vo is the desired output voltage. the 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 (VHB150W-Q48-S5) by 8% to 5.4V, R trim-up is calculated (VHB150W-Q48-S5) by 8% to 4.6V, R trim-down is calculated as follows: as follows: page date DESCRIPTION: half-brick 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: VHB150W R load 10K Ω Trimpot +Vin -Vin -Vo -S Trim +S +Vo Vo –Vo,nom) ( Vo –Vo,nom ) (k Ω × − = 1 )) ( (R 2 R Vo – Vo,nom ) ( Vo – Vo,nom ) (k Ω × − = 1 )) ( (R 2 R Output Voltage(V) R1 (Kohm) R2 (Kohm) 3.3V 3.168 7.2 5V 5.8 3.3 12V 18.945 4.636 15V 25.189 7.191 24V 41.442 6.977 Table 1 R load R trim-up +Vin -Vin +Vo +S Trim -S -Vo R load R trim-down +Vin -Vin +Vo +S Trim -S -Vo 5 – 5.4 ) ( 5 – 5.4 9.18kΩ × − = )) ( (5.8 3.3 Vo – Vo,nom = 5.4 – 5.0 = 0.4V = 5.8 kΩ = 3.3 kΩ 2 R 1 R = Vo,nom – Vo = 5.0 – 4.6 = 0.4V = 5.8 kΩ = 5.32 kΩ 2 R 1 R 4.6 – 5 ) ( 4.6 – 5 11.2kΩ × − = = )) ( (5.8 5.32 FIGURE 3. TRIMMING WITH EXTERNAL POTENTIOMETER Output Voltage(V) R1 (Kohm) R2 (Kohm) 3.3V 6.18 15 5V 5.8 5.62 12V 86.45 60.1 15V 150 68 24V 430 120 Table 2 Vo –Vo,nom) ( Vo –Vo,nom ) (k Ω × − = 1 )) ( (R 2 R Vo – Vo,nom ) ( Vo – Vo,nom ) (k Ω × − = 1 )) ( (R 2 R |
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