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AHP27012DZES Datasheet(PDF) 8 Page - International Rectifier |
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AHP27012DZES Datasheet(HTML) 8 Page - International Rectifier |
8 / 10 page 8 www.irf.com AHP270XXD Series Figure V. Connection for V OUT Adjustment Input Filter Undervoltage Lockout The AHP270XXD series converters incorporate a single stage LC input filter whose elements dominate the input load impedance characteristic during the turn-on sequence. The input circuit is as shown in Figure IV. Figure IV. Input Filter Circuit A minimum voltage is required at the input of the converter to initiate operation. This voltage is set to 150V ± 5.0V. To preclude the possibility of noise or other variations at the input falsely initiating and halting converter operation, a hysteresis of approximately 10V is incorporated in this circuit. Thus if the input voltage droops to 140V ± 5.0V, the converter will shut down and remain inoperative until the input voltage returns to ≈ 150V. Output Voltage Adjust Connect R adj to + to increase, - to decrease 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 voltages. The span of output voltage adjustment is restricted to the limits shown in Table I. Table 1. Output Voltage Trim Values and Limits 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 greater than nominal, the adjust resistor is connected to output return. To set the magnitude less than 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 listed 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 this adjust 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, is advised to employ resistors with a tight temperature coefficient of resistance. 8.4µH Pin 1 Pin 2 0.54µfd Enable 2 Share Trim - Vout Return + Vout To Loads R ADJ AHP270XXD 7 12 + - AHP27005D AHP27012D AHP27015D Vout Radj Vout Radj Vout Radj 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 Input Overvoltage Protection One additional protection feature is incorporated into the AHP input circuit. It is an input over-voltage protection. The output will shutdown and start at approximately 110% of the maximum rated input voltage. |
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