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APC12MK03-9MAJ Datasheet(PDF) 10 Page - Astec America, Inc |
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APC12MK03-9MAJ Datasheet(HTML) 10 Page - Astec America, Inc |
10 / 23 page Technical Reference Notes APC12 Centauri II MODEL: APC12 SERIES SHEET 10 OF 23 JANUARY 6, 2002 REVISION A (PRELIMINARY) Trim Function (continued) To adjust Vo to a higher value, please refer to Figure 4. The required resistor value (Rt) can be determined through Equation (1) where Vo is the voltage on P2 before the adjustment and Vot is the voltage of P2 after Rt is connected. 1 R Vo Vot Vref Rt − = Equation (1) Please refer to related constants given in TABLE 1 to calculate the Equation. TABLE 1. CONSTANTS Version 0.9V 1.2V 1.5V 1.8V 2.5V 3.3V R1 APC08/12x03 R2 97.6k 8.45k 4.32k 2.94k 1.69k 1.13k 3.09k APC08/12x08 R2 210k 17.4k 9.09k 6.04k 3.48k 2.32k 6.49k Vref 0.87V Be aware that the maximum Vo allowed is 3.6V. Please refer to Centauri datasheet. Example: Module version: APC08J03-9 (1.8 to 6.0Vin, 0.9Vo). Requiring to adjust output voltage from Vo = 0.9V to Vot = 1.8V. Vref = 0.87V and R1 = 3.09k Ω (from TABLE 1). Based on Equation (1), Rt can be determined as 3.0k Ω. To adjust Vo to a lower value, Rt should be connected between P4 and P2. Equation (2) provides the calculation for Rt. 2 ) ( ) )( ( R V V V V V V V Rt ot o ref ref ot ref o − − − = Equation (2) Be aware that the minimum Vo is 0.9V. Example Module version: APC08F03-9 (4.0 to 6.Vin, 3.3Vo). Requiring to adjust the output voltage from Vo = 3.3V to Vot = 3.3 (1-0.02) = 3.234V. Vo = 3.3V, Vot = 3.234V, Vref = 0.87V, R2 = 1.13k Ω (from TABLE 1). Based on Equation (1), Rt can be determined as 111.9k Ω. Figure 4. Output Voltage Trim Setup. |
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