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參數(shù)資料
| 型號(hào)： | AFL27005D |
| 英文描述： | Hi-Rel DC-DC Standard Dual Converter in a AFL package |
| 中文描述： | 高可靠性的DC - DC標(biāo)準(zhǔn)在冬季兩項(xiàng)包雙轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 9/10頁(yè) |
| 文件大?。?/td> | 137K |
| 代理商： | AFL27005D |
9
Input Filter
The AFL27000S series converters incorporate a
single stage LC input filter whose elements
dominate the input load impedance characteristic
during the turn-on sequence. The input circuit is as
shown in Figure IV.
Figure IV. Input Filter Circuit
8.4μH
Pin 1
Pin 2
0.54μfd
Undervoltage Lockout
A minimum voltage is required at the input of the
converter to initiate operation. This voltage is set to
140
±
5 volts. To preclude the possibility of noise or
other variations at the input falsely initiating and
halting converter operation, a hysteresis of
approximately 10 volts is incorporated in this circuit.
Thus if the input voltage droops to 130
±
5 volts, the
converter will shut down and remain inoperative
until the input voltage returns to
≈
140 volts.
Output Voltage Adjust
In addition to permitting close voltage regulation of
remotely located loads, it is possible to utilize the
converter sense pins to incrementally increase the
output
voltage
over
a
adjustments made possible by this method are
intended as a means to “trim” the output to a voltage
setting for some particular application, but are not
intended to create an adjustable output converter.
These output voltage setting variations are obtained
by connecting an appropriate resistor value between
the +sense and -sense pins while connecting the -
sense pin to the output return pin as shown in Figure
V. below. The range of adjustment and
corresponding range of resistance values can be
determined by use of the equation presented below.
limited
range.
The
R
= 100
-
-.025
adj
NOM
V
V
OUT
V
NOM
Where
V
NOM
= device nominal output voltage, and
V
OUT
= desired output voltage
Finding a resistor value for a particular output
voltage, is simply a matter of substituting the
desired output voltage and the nominal device
voltage into the equation and solving for the
corresponding resistor value.
Figure V. Connection for V
OUT
Adjustment
Enable 2
Share
+ Sense
- Sense
Return
+ V
out
To Load
R
ADJ
AFL270xxS
Caution: Do not set R
adj
< 500
Attempts to adjust the output voltage to a value
greater than 120% of nominal should be avoided
because of the potential of exceeding internal
component stress ratings and subsequent operation
to failure. Under no circumstance should the
external setting resistor be made less than 500
.
By remaining within this specified range of values,
completely safe operation fully within normal
component derating is assured.
Examination of the equation relating output voltage
and resistor value reveals a special benefit of the
circuit topology utilized for remote sensing of output
voltage in the AFL270xxS series of converters. It is
apparent that as the resistance increases, the output
voltage approaches the nominal set value of the
device. In fact the calculated limiting value of
output voltage as the adjusting resistor becomes
very large is
25mV above nominal device voltage.
The consequence is that if the +sense connection is
un-intentionally broken, an AFL270xxS has a fail-
safe output voltage of Vout + 25mV, where the
25mV is independent of the nominal output voltage.
It can be further demonstrated that in the event of
both the + and - sense connections being broken,
the output will be limited to Vout + 440mV. This 440
mV is also essentially constant independent of the
nominal output voltage. While operation in this
condition is not damaging to the device, not all
performance parameters will be met.
Performance Data
Typical performance data is graphically presented
on the following pages for selected parameters on a
variety of AFL270xxS type converters. The data
presented was selected as representative of more
critical parameters and for general interest in typical
converter applications.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AFL27028DW | DC to DC Converter |
| AFL27012D | Hi-Rel DC-DC Standard Dual Converter in a AFL package |
| AFL27015D | Hi-Rel DC-DC Standard Dual Converter in a AFL package |
| AFL27028DX | DC to DC Converter |
| AFL27028DY | DC to DC Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AFL27005DW | 制造商:International Rectifier 功能描述:DC/DC CONVERTER, MINIMUM SCREENING - Bulk |
| AFL27005DW/CH | 制造商:International Rectifier 功能描述:DC/DC CONVERTER, CLASS H - Bulk |
| AFL27005DW/ES | 制造商:International Rectifier 功能描述:DC/DC CONVERTER, ENVIRONMENTAL SCREENING - Bulk |
| AFL27005DW/HB | 制造商:International Rectifier 功能描述:DC/DC CONVERTER, CLASS H EQUIVALENT, NO ELEM EVAL - Bulk |
| AFL27005DWCH | 制造商:IRF 制造商全稱(chēng):International Rectifier 功能描述:270V Input, Single Output |
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