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參數(shù)資料
| 型號： | ARH2805.2S/SF |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | LOW PROFILE, HERMETIC SEALED, RUGGED PACKAGE-12 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 118K |
| 代理商： | ARH2805.2S/SF |
11
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 ARH2800S converter. This
protection is implemented by sensing primary
switching
current
and,
when
an
over-current
condition is detected, switching action is terminated
and a restart cycle is initiated.
If the short circuit
condition has not been cleared by the time the
restart cycle has completed, another restart cycle is
initiated.
The sequence will repeat until the short
circuit condition is cleared at which time the
converter will resume normal operation. The effect
is that during a shorted condition, a series of narrow
pulses are generated at approximately 5% duty
cycle which periodically sample the state of the
load.
Thus device power dissipation is greatly
reduced during this mode of operation.
Input Undervoltage Protection
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 variations at the input
falsely initiating and halting converter operation, a
hysteresis of approximately 1.0 volts is incorporated
in this circuit. The converter is guaranteed to
operate at 18 Volts input under all specified
conditions.
Input Filter
To attenuate input ripple current, the ARH2800S
series converters incorporate a two stage LC input
filter.
The elements of this filter comprise the
dominant input load impedance characteristic, and
therefore determine the nature of the current inrush
at turn-on. The input filter circuit elements are as
shown in Figure IV.
Figure IV. Input Filter Circuit
+ Input
Input
Return
3.6 H
5.4 fd
3
5.4 fd
2.6 H
EMI Filtering
Although internal filtering is provided at both input
and output terminals of the ARH series converters,
some applications may require additional filtering in
order
to
accommodate
particular
system
requirements.
While the internal input filter of Figure IV maintains
input ripple current below 50 mAp-p, an external filter
can be applied to further attenuate this ripple to a
level below the CE03 limits imposed by MIL-STD-
461.
Lambda Advanced Analog is presently
supplying such a filter housed in a complementary
package.
Output Noise
When measuring noise on the output of switching
converters, measurement techniques employed can
impose a significant influence on results when
performing these tests.
All noise measurements
should be undertaken with test leads as close to the
device output pins as physically possible.
Probe
ground leads should be kept to a minimum (<< 1”)
length to prevent any parasitic impedance from
erroneously influencing results.
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