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參數(shù)資料
| 型號： | ART2812T |
| 廠商： | International Rectifier |
| 英文描述： | 28V Input, Triple Output / HYBRID - HIGH RELIABILITY RADIATION HARDENED DC/DC CONVERTER |
| 中文描述： | 28V的，三路輸出輸入/混合-高可靠性的抗輻射直流/直流轉(zhuǎn)換器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 229K |
| 代理商： | ART2812T |
8
www.irf.com
ART28XXT Series
Figure III. Synchronization Input Equivalent Circuit
Output Load Fault Protection
Parallel Operation
Although no special provision for forced current sharing
has been incorporated in the ART28XXT series, multiple
units may be operated in parallel for increased output power
applications. The 5.0 volt outputs will typically share to
within approximately 10% of their full load capability and
the dual (±15 volt) outputs will typically share to within
50% of their full load. Load sharing is a function of the
individual impedance of each output and the converter
with the highest nominal set voltage will furnish the
predominant load current.
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 19 Volts input under all specified conditions.
Input Undervoltage Protection
Input Filter
To attenuate input ripple current, the ART28XXT 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 V.
Figure V. Input Filter Circuit
Synchronization
An additional feature is a synchronization output (pin 5)
permitting multiple ART28XX converters in a system to be
synchronized to one of the converters in the set. See
Figure IV.
The sync input port permits synchronization of an ART
converter to any compatible external frequency source
operating in the band of 225 to 310 KHz. The synchronization
input is edge triggered with synchronization initiated on
the negative transition. This input signal should be a
negative going pulse referenced to the input return and
have a 20% to 80% duty cycle. Compatibility requires the
negative transition time to be less than 100 ns with minimum
pulse amplitude of +4.25 volts referred to the input return.
In the absence of an external source, the converter will
revert to its own internally set frequency. If external
synchronization is not desired, the sync in pin may be left
open (unconnected) permitting the converter to operate at
its’ own internally set frequency.
Figure IV. Synchronization Output Equivalent Circuit
6K
2N2222
4K
10pf
Sync
Output
Input
Return
+10V
5
2
10K
To Internal
Clock
An additional feature is a synchronization output (pin 5)
permitting multiple Protection against overload or short
circuit on any output is provided in the ART28XXT converter
series. This protection is implemented by sensing primary
switching current and, when a load fault condition is
detected, pulse width is limited by the protection circuitry.
The converter is able to operate continuously with a load
fault witout damage or exceeding derating limits.
5K
2N2907A
10K
47pf
Sync
Input
Input
Return
+10V
Pin 1
Pin 2
34 μH
5.4 μfd
1.35
4.7 μH
Systems using multiple convertors may dictate operating
the group at a common switching frequency. To
accomodate this requirement, the ART28XXT converters
include a synchronization input (pin 4). Topology is
illustrated in Figure III.
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相關代理商/技術參數(shù) |
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| ART2812T/CK | 制造商:IRF 制造商全稱:International Rectifier 功能描述:HYBRID - HIGH RELIABILITY RADIATION HARDENED DC/DC CONVERTER |
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