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APC08M08-9MA Datasheet(PDF) 10 Page - Astec America, Inc |
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APC08M08-9MA Datasheet(HTML) 10 Page - Astec America, Inc |
10 / 23 page Technical Reference Note (APC08) MODEL: APC08 SERIES SHEET 10 OF 23 OCTOBER 4, 2004 - REVISION 03 Method 1: External Trim Resistor (continued) 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 = 0.875V, R2 = 1.13kΩ (from TABLE 1). Based on Equation (1), Rt can be determined as 111.9k Ω. Trim Function (continued) Method 2: External DC Source By connecting an external DC supply across P4 (Enable) and P3 (GND) through a limiting resistor Rt, (see Figure 5), output voltage adjustment can also be achieved. Equation 3 provides the relationship between the External DC supply, Vt, and Vo (where Vo is the desired output voltage). Given: Rt = 10k Ω Vo Adjustment to Lower Voltages. This method does not limit the recommended lower Vo adjustment to 2% as mentioned on previous sections re: Vo adjustment through external trim resistor. Example: Module version: APC08G03-9 (3V to 6Vin, 2.5Vo). Requiring to adjust the output voltage from Vo = 2.5V to 1.8V Vo = 1.8V, Vr = 0.87V, R1 = 3.09kΩ, R2 = 1.69kΩ (from Table 1). Based on Equation (3), Vt = 3.0V. Example: Module version: APC08G03-9 (3V to 6Vin, 2.5Vo). Requiring to adjust the output voltage from Vo = 2.5V to 0.9V Vo = 0.9V, Vr = 0.87V, R1 = 3.09kΩ, R2 = 1.69kΩ (from Table 1). Based on Equation (3), Vt = 5.9V. Vo R Rt Vr R Rt R Rt Vt 1 2 1 1 − + + = Equation (3) Figure 5. External DC source for output trim adjust. |
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