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ALD25Y48- Datasheet(PDF) 6 Page - Astec America, Inc |
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ALD25Y48- Datasheet(HTML) 6 Page - Astec America, Inc |
6 / 20 page Technical Reference Notes ALD12/18/20/25 Series (Single Output 16 th Brick) MODEL: ALD12/18/20/25 SERIES SHEET 6 OF 20 AUGUST 17, 2005 – REVISION C +Vin -Vin Enable -Vout +Vout -Sense +Sense Vadj Rload Radj_up Figure 3. External resistor configuration to increase the outputs +Vin -Vin Enable -Vout +Vout -Sense +Sense Vadj Rload Radj_down Figure 4. External resistor configuration to increase the outputs Basic Operation and Features INPUT UNDER VOLTAGE LOCKOUT To prevent any instability to the converter, which may affect the end system, the converter have been designed to turn-on once VIN is in the voltage range of 34-36 VDC. Likewise, it has also been programmed to turn-off when VIN drops down to 31-33.5 VDC. OUTPUT VOLTAGE ADJUST/TRIM The converter comes with a TRIM pin (PIN 6), which is used to adjust the output by as much as 90% to 110% of its set point. This is achieved by connecting an external resistor as described below. To INCREASE the output, external Radj_up resistor should be connected between TRIM PIN (Pin6) and +SENSE PIN (Pin 7). Please refer to Equation (1) for the required external resistance and output adjust relationship. Equation (1a): 1.5V to 5V Equation (1b): 1.2V To DECREASE the output, external Radj_down resistor should be connected between TRIM pin (Pin 6) and -SENSE PIN (Pin 5). Please refer to Equation (2) for the required external resistance and output adjust relationship. Equation (2): Where: ∆% = percent change in output voltage OUTPUT ENABLE The converter comes with an Enable pin (PIN 2), which is primarily used to turn ON/OFF the converter. Both a Positive (no “N” suffix required) and a Negative (suffix “N” required) Enable Logic options are being offered. Radj_down 510 ∆% 10.2 − k Ω ⋅ Radj_up 5.1 Voset × 100 ∆% + () × 0.6 ∆% × 510 ∆% − 10.2 − =ΚΩ Radj_up 5.1 Voset × 100 ∆% + () × 1.225 ∆% × 510 ∆% − 10.2 − =ΚΩ |
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