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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)： | 12/12頁 |
| 文件大?。?/td> | 118K |
| 代理商： | ARH2805.2S/SF |
9
ARH2800S Circuit Description
Figure I. ARH Block Diagram
Sample
& Hold
+Vout
Return
Short
Circuit
Pulse Width
Modulator
Primary Bias
& Reference
EMI
Filter
Under-Voltage
Detector
+Input
Enable
Sync In
Input
Return
Level
Translator
& Buffer
Error
Amp
+
-
+Sense
-Sense
Sync Out
Circuit Description and Application Information
The ARH2800S series of converters have been
designed using a single ended forward switched
mode converter topology. (Refer to Figure I.) Single
ended topologies enjoy some advantage in radiation
hardened
designs
in
that
they
eliminate
the
possibility of simultaneous turn on of both switching
elements during a radiation induced upset; in
addition, single ended topologies are not subject to
transformer saturation problems often associated
with double ended implementations.
The design incorporates a two-stage LC input filter
to attenuate input ripple current.
A low overhead
linear bias regulator provides both a bias voltage for
the converter primary control logic and a stable,
well-regulated reference for the error amplifier.
Output control is realized using a wide band discrete
pulse width modulator control circuit incorporating a
unique non-linear ramp generator circuit.
This
circuit helps stabilize loop gain over variations in
line voltage for superior output transient response.
Nominal conversion frequency has been selected as
250 KHz to maximize efficiency and minimize
magnetic element size.
Output voltages are sensed and fed back to the
controller using a patented magnetic feedback
circuit.
This circuit is designed to be relatively
insensitive to variations in temperature, aging,
radiation and manufacturing tolerances making it
particularly
well
suited
to
radiation
hardened
designs. The control logic has been designed to use
only radiation tolerant components, and current
paths include series resistances to limit photo
currents.
Other key circuit design features include short circuit
protection, undervoltage lockout and an external
synchronization input port permitting operation at an
externally
set
clock
rate.
Alternately,
a
synchronization
output
is
provided
to
lock
frequencies with another converter when using more
than one converter in a system
Thermal Considerations
The ARH series of converters is capable of
providing relatively high output power from a
package of modest volume.
The power density
exhibited by these devices is obtained by combining
high circuit efficiency with effective methods of heat
removal from the die junctions.
Good design
practices
have
effectively
addressed
this
requirement inside the device.
However when
operating at maximum loads, heat generated at the
die junctions depends upon thermal conduction from
the base plate for that heat to be carried away. To
maintain case temperature at or below the specified
maximum of 125°C, this heat can be transferred by
attachment to an appropriate heat dissipater held in
intimate contact with the converter base-plate.
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