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AHP27028S Datasheet(PDF) 9 Page - International Rectifier

Part No. AHP27028S
Description  HYBRID - HIGH RELIABILITY DC/DC CONVERTER
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Maker  IRF [International Rectifier]
Homepage  http://www.irf.com
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AHP27028S Datasheet(HTML) 9 Page - International Rectifier

 
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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.
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+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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