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AHP27025SXES Datasheet(PDF) 9 Page - International Rectifier |
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AHP27025SXES Datasheet(HTML) 9 Page - International Rectifier |
9 / 12 page www.irf.com 9 AHP270XXS Series Attempts to adjust the output voltage to a value greater than 120% of nominal should be avoided because of the potential of exceeding internal component stress ratings and subsequent operation to failure. Under no circumstance should the external setting resistor be made less than 500 Ω. By remaining within this specified range of values, completely safe operation fully within normal component derating is assured. The consequence is that if the +sense connection is unintentionally broken, an AHP270XXS has a fail-safe output voltage of Vout + 250mV, where the 250mV is independent of the nominal output voltage. It can be further demonstrated that in the event of both the + and - sense connections being broken, the output will be limited to Vout + 500mV. This 500mV is also essentially constant independent of the nominal output voltage. While operation in this condition is not damaging to the device, not all performance parameters will be met. Enable 2 Share +Sense - Sense Return +Vout AHP270XXS R ADJ To Load Figure VI. Connection for V NOM< VOUT < (VNOM+ 0.25V) Examination of the equation relating output voltage and resistor value reveals a special benefit of the circuit topology utilized for remote sensing of output voltage in the AHP270XXS series of converters. It is apparent that as the resistance increases, the output voltage approaches the nominal set value of the device. In fact the calculated limiting value of output voltage as the adjusting resistor becomes very large is ≅ 250mV above nominal device voltage. |
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