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參數(shù)資料
| 型號(hào)： | ARM2812T |
| 英文描述： | Hi-Rel DC-DC MegaRad-Hard Triple Converter in a ARM package |
| 中文描述： | 高可靠性的DC - DC MegaRad硬三轉(zhuǎn)換器在ARM的包 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 94K |
| 代理商： | ARM2812T |
8
www.irf.com
ARM28XXT Series
Figure III. Synchronization Input Equivalent Circuit
5K
2N2907A
5K
47pf
Sync
Input
Input
Return
+10V
Protection against accidental short circuits on any output
is provided in the ARM28XXT converters. This protection
is implemented by sensing primary switching current and,
when an over-current condition is detected, switching ac-
tion 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 initi-
ated. The sequence will repeat until the short circuit condi-
tion is cleared at which time the converter will resume
normal operation. The effect is that during a shorted con-
dition, a series of narrow pulses are generated at approxi-
mately 5% duty cycle which periodically sample the state
of the load. Thus device power dissipation is greatly re-
duced during this mode of operation.
Output Short Circuit Protection
Parallel Operation
Although no special provision for forced current sharing
has been incorporated in the ARM28XXT series, multiple
units may be operated in parallel for increased output power
applications. The 5 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 imped-
ance of each output and the converter with the highest
nominal set voltage will furnish the predominant load cur-
rent.
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 con-
verter 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 ARM28XXT series
converters incorporate a single 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.
+ Input
Input
Return
3.6 μH
5.4 μfd
10
Figure IV. Input Filter Circuit
Synchronization
When using multiple converters, system requirements may
dictate operating several converters at a common sys-
tem frequency. To accommodate this requirement, the
ARM28XXT type converter provides a synchronization
input port (pin 4). Circuit topology is as illustrated in Figure
III.
The sync input port permits synchronization of an ARM
converter to any compatible external frequency source
operating in the band of 225 to 310 KHz. The synchroniza-
tion 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 a mini-
mum pulse amplitude of +4.25 volts referred to the input
return. In the event of failure of an external synchroniza-
tion source, the converter will revert to its own internally
set frequency. When external synchronization is not de-
sired, the sync in port may be left open (unconnected)
permitting the converter to operate at its’ own internally set
frequency.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ARM2812T/CK | 制造商:IRF 制造商全稱:International Rectifier 功能描述:HYBRID - HIGH RELIABILITY 1 MEGA-RAD HARDENED DC/DC CONVERTER |
| ARM2812T/EM | 制造商:IRF 制造商全稱:International Rectifier 功能描述:HYBRID - HIGH RELIABILITY 1 MEGA-RAD HARDENED DC/DC CONVERTER |
| ARM2815T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Hi-Rel DC-DC MegaRad-Hard Triple Converter in a ARM package |
| ARM2815T/CK | 制造商:IRF 制造商全稱:International Rectifier 功能描述:HYBRID - HIGH RELIABILITY 1 MEGA-RAD HARDENED DC/DC CONVERTER |
| ARM2815T/EM | 制造商:IRF 制造商全稱:International Rectifier 功能描述:HYBRID - HIGH RELIABILITY 1 MEGA-RAD HARDENED DC/DC CONVERTER |
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