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APC12M03 Datasheet(PDF) 11 Page - Astec America, Inc |
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APC12M03 Datasheet(HTML) 11 Page - Astec America, Inc |
11 / 23 page Technical Reference Notes APC12 Centauri II MODEL: APC12 SERIES SHEET 11 OF 23 JANUARY 6, 2002 REVISION A (PRELIMINARY) 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, Vref = 0.87V, R1 = 3.09k Ω, 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, Vref = 0.87V, R1 = 3.09k Ω, R2 = 1.69kΩ (from Table 1). Based on Equation (3), Vt = 5.9V. Vo Adjustment to Higher Voltages Example: Module version: APC08G03-9 (3V to 6Vin, 2.5Vo). Requiring to adjust the output voltage from Vo = 2.5V to 3.3V Vo = 3.3V, Vref = 0.87V, R1 = 3.09k Ω, R2 = 1.69kΩ (from Table 1). Based on Equation (3), Vt = -1.84V. If application of negative voltage is not desired, the limiting resistor Rt can either be changed to a lower value (Rt = 1k Ω Ω Ω Ω, such that Vt = 0.60V per Equation 3), or use Method 1. Vo R Rt Vref R Rt R Rt Vt 1 2 1 1 − + + = Equation (3) Figure 5. External DC source for output trim adjust. |
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