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AFL2815DWHB Datasheet(PDF) 8 Page - International Rectifier |
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AFL2815DWHB Datasheet(HTML) 8 Page - International Rectifier |
8 / 11 page 8 www.irf.com AFL50XXD Series Input Filter Undervoltage Lockout The AFL50XXD series converters incorporate a single stage LC input filter whose elements dominate the input load impedance characteristic during the turn-on. The input circuit is as shown in Figure IV. Figure IV. Input Filter Circuit Output Voltage Adjust By use of the trim pin (10), the magnitude of output voltages can be adjusted over a limited range in either a positive or negative direction. Connecting a resistor between the trim pin and either the output return or the positive output will raise or lower the magnitude of output voltage. The span of output voltage magnitude is restricted to the limits shown in Table I. Figure V. Connection for V OUT Adjustment Connect Radj to + to increase, - to decrease. Table I. Output Voltage Trim Values and Limits AFL5005D AFL5012D AFL5015D V out R adj V out R adj V out R adj 5.5 0 12.5 0 15.5 0 5.4 12.5K 12.4 47.5K 15.4 62.5K 5.3 33.3K 12.3 127K 15.3 167K 5.2 75K 12.2 285K 15.2 375K 5.1 200K 12.1 760K 15.1 1.0M 5.0 ∞ 12.0 ∞ 15.0 ∞ 4.9 190K 11.7 975K 14.6 1.2M 4.8 65K 11.3 288K 14.0 325K 4.7 23K 10.8 72.9K 13.5 117K 4.6 2.5K 10.6 29.9K 13.0 12.5K 4.583 0 10.417 0 12.917 0 Note that the nominal magnitude of output voltage resides in the middle of the table and the corresponding resistor value is set to ∞. To set the magnitude above nominal, the adjust resistor is connected to output return. To set the magnitude below nominal, the adjust resistor is connected to the positive output. (Refer to Figure V.) For output voltage settings that are within the limits, but between those presented in Table I, it is suggested that the resistor values be determined empirically by selection or by use of a variable resistor. The value thus determined can then be replaced with a good quality fixed resistor for permanent installation. When use of the trim feature is elected, the user should be aware that the temperature performance of the converter output voltage will be affected by the temperature performance of the resistor selected as the adjustment element and therefore, the user is advised to employ resistors with an very small temperature coefficient of resistance. 0.75µH Pin 1 Pin 2 2.7µfd A minimum voltage is required at the input of the converter to initiate operation. This voltage is set to 26.5 ± 1.5V. To preclude the possibility of noise or other variations at the input falsely initiating and halting converter operation, a hysteresis of approximately 2.0V is incorporated in this circuit. Thus if the input voltage droops to 24.5 ± 1.5V, the converter will shut down and remain inoperative until the input voltage returns to ≈ 25V. Enable 2 Share Trim - Vout Return + Vout To Loads R ADJ AFL50xxD 7 12 + - |
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