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ARH2805S Datasheet(PDF) 9 Page - International Rectifier

Part # ARH2805S
Description  HYBRID - HIGH RELIABILITY RADIATION HARDENED DC/DC CONVERTERS
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

ARH2805S Datasheet(HTML) 9 Page - International Rectifier

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9
ARH28XXS Series
When an external frequency source is not available, an
internal clock signal is provided through appropriate
buffering at the sync out port. This port can drive a
minimum of 3 ARH sync in ports thereby allowing all to
operate at the same clock frequency.
Output Short Circuit Protection
Protection against accidental short circuits on the output
is provided in the ARH28XXS converter. This protection is
implemented by sensing primary switching current and
reducing the switching pulse widths when a short occurs.
The output current is therefore limited to a maximum value,
which protects the converter. Under this condition the
internal power dissipation is nearly the same as for
maximum loading.
Input Undervoltage Protection
Input Filter
Figure III. Input Filter
EMI Filtering
Output Noise
Although the internal filtering provided at both input and
output terminals of the ARH series converters is sufficient
for most applications, some critical applications may
require additional filtering in order to accommodate particular
system requirements.
While the internal input filter maintains input ripple current
below 50 mA
p-p,
an external filter can be applied to further
attenuate this ripple to a level below the CE03 limits imposed
by MIL-STD-461. International Rectifier currently supplies
such a filter housed in a complementary package. The
catalog number of this part is ARF461.
When attempting noise measurement at the output of
switching converters, measurement techniques employed
can have a significant influence on results during these
tests. Any noise measurements should be undertaken
only with test leads dressed as close to the device output
pins as is physically possible. Probe ground leads should
be kept to a minimum (<< 1") length to minimize the influence
of parasitic impedances on results.
To attenuate input ripple current, the ARH28XXS series
converters incorporate a two-stage LC input filter illustrated
in Figure III following. The elements of this filter comprise
the dominant input load impedance characteristic, and
therefore determine the nature of the current inrush at
turn-on.
A minimum voltage is required at the input of the converter
to initiate operation. This voltage is set to a nominal value
of 16.8 volts. To preclude the possibility of noise or other
voltage variations at the input falsely initiating and halting
converter operation, a hysteresis of approximately 1.0
volts is incorporated into this circuit. The converter is
guaranteed to operate at 18 Volts input under all specified
conditions.


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