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VCD40-D12-D12 Datasheet(PDF) 5 Page - CUI INC |
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VCD40-D12-D12 Datasheet(HTML) 5 Page - CUI INC |
5 / 5 page rev. page date DESCRIPTION: DC/DC converter 5 of 5 10/2007 20050 SW 112th Ave. Tualatin, Oregon 97062 phone phone 503.612.2300 fax fax 503.612.2382 PART NUMBER: VCD40 series +Vin -Vin -Vout +Vout R adj,up R-Load Trim +Sense -Sense In order to trim the voltage up or down one needs to connect the trim resistor either between the trim pin and -Vo for trim-up and between trim pin and +Vo for trim-down. The output voltage trim range is ±10%. This is shown in Figures 1 and 2: Figure 1. Trim-up Voltage Setup +Vin -Vin -Vout +Vout R adj,down R-Load Trim +Sense -Sense Figure 2. Trim-down Voltage Setup Model Number Output Voltage(V) R1 (Kohm) R2 (Kohm) R3 (Kohm) Rt (Kohm) Vr 3.3V 2.74 1.8 0.27 9.1 1.24 12V 6.8 2.4 2.32 22 2.5 15V 8.06 2.4 3.9 27 2.5 ) (K ) 1 ( , Ω - - x = - Rt V Vo Vr R R nom o up trim 1. The value of Rtrim-up defined as: Where: R trim-up is the external resistor in Kohm. Vo,nom is the nominal output voltage. Vo is the desired output voltage. R1 ,Rt and Vr are internal to the unit and are defined in Table 1. Table 1 - Trim Resistor Values Model Number Output Voltage(V) R1 (Kohm) Rt (Kohm) Vr For example, to trim-up the output voltage of 5.0V module (VCD40-D48-S5) by 5% to 5.25V, R trim-up is calculated as follows: Vo – Vo,nom = 5.25 – 5.0 = 0.25V R1 = 2.32 Kohm Rt = 8.2 Kohm , Vr= 2.5 ) (K 15 2 . 8 25 . 0 5 . 2 32 . 2 Ω = - x = - up trim R The value of R trim-down defined as: ) (K ) ( 1 , Ω - - - x = - Rt Vo V Vr Vo R R nom o down trim Where: R trim-down is the external resistor in Kohm. Vo,nom is the nominal output voltage. Vo is the desired output voltage. R1 ,Rt and Vr are internal to the unit and are defined in Table 1. For example, to trim-down the output voltage of 5.0V module (VCD40-D48-S5) by 5% to 4.75V, R trim-down is calculated as follows : Vo,nom – Vo = 5.0 – 4.75 = 0.25 V R1 = 2.32 Kohm R t = 8.2 Kohm , Vr=2.5 ) (K 68 . 12 2 . 8 25 . 0 ) 5 . 2 75 . 4 ( 32 . 2 Ω = - - x = - down trim R 2. The output Voltage 3.3V,12V and 15V value of Rtrim are defined as below: ) (K ) 2 ) ( ) 3 2 ( 1 ( , Ω - x - + x x = - Rt R V Vo R R R Vr R nom o up trim ) (K Ω ) 1 2 ) ( 1 ( 1 , - - x - x x = - Rt R Vo V R Vr R R nom o down trim Where: R trim-up is the external resistor in Kohm. Vo,nom is the nominal output voltage. Vo is the desired output voltage. R1, R2, R3, Rt and Vr are internal to the unit and are defined in Table 2. Table 2 - Trim Resistor Values VCD40-D24-S5 VCD40-D48-S5 5.0 2.32 8.2 2.5 VCD40-D24-S3R3 VCD40-D48-S3R3 VCD40-D24-S12 VCD40-D48-S12 VCD40-D24-S15 VCD40-D48-S15 TRIM INFORMATION |
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