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參數資料
| 型號： | AFL5015DY/ESPBF |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 100 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | 0.380 INCH, LOW PROFILE, SEAM WELDED PACKAGE-12 |
| 文件頁數： | 9/10頁 |
| 文件大小： | 82K |
| 代理商： | AFL5015DY/ESPBF |
8
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AFL50XXD Series
Input Filter
Undervoltage Lockout
The AFL50XXD series converters incorporate a single stage
LC input filter whose elements dominate the input load im-
pedance characteristic during the turn-on. The input circuit
is as shown in Figure IV.
Figure IV. Input Filter Circuit
Output Voltage Adjust
By use of the trim pin (10), the magnitude of output voltages
can be adjusted over a limited range in either a positive or
negative direction. Connecting a resistor between the trim
pin and either the output return or the positive output will
raise or lower the magnitude of output voltage. The span of
output voltage magnitude is restricted to the limits shown in
Table I.
Figure V. Connection for V
OUT Adjustment
Connect Radj to + to increase, - to decrease.
Table I. Output Voltage Trim Values and Limits
AFL5005D
AFL5012D
AFL5015D
V
out
R
adj
V
out
R
adj
V
out
R
adj
5.5
0
12.5
0
15.5
0
5.4
12.5K
12.4
47.5K
15.4
62.5K
5.3
33.3K
12.3
127K
15.3
167K
5.2
75K
12.2
285K
15.2
375K
5.1
200K
12.1
760K
15.1
1.0M
5.0
∞
12.0
∞
15.0
∞
4.9
190K
11.7
975K
14.6
1.2M
4.8
65K
11.3
288K
14.0
325K
4.7
23K
10.8
72.9K
13.5
117K
4.6
2.5K
10.6
29.9K
13.0
12.5K
4.583
0
10.417
0
12.917
0
Note that the nominal magnitude of output voltage resides in
the middle of the table and the corresponding resistor value
is set to
∞. To set the magnitude above nominal, the adjust
resistor is connected to output return. To set the magnitude
below nominal, the adjust resistor is connected to the posi-
tive output. (Refer to Figure V.)
For output voltage settings that are within the limits, but
between those presented in Table I, it is suggested that the
resistor values be determined empirically by selection or by
use of a variable resistor. The value thus determined can
then be replaced with a good quality fixed resistor for per-
manent installation.
When use of the trim feature is elected, the user should be
aware that the temperature performance of the converter
output voltage will be affected by the temperature perfor-
mance of the resistor selected as the adjustment element
and therefore, the user is advised to employ resistors with
an very small temperature coefficient of resistance.
0.75H
Pin 1
Pin 2
2.7 fd
A minimum voltage is required at the input of the converter
to initiate operation. This voltage is set to 26.5 ± 1.5 volts. To
preclude the possibility of noise or other variations at the
input falsely initiating and halting converter operation, a hys-
teresis of approximately 2 volts is incorporated in this cir-
cuit. Thus if the input voltage droops to 24.5 ± 1.5 volts, the
converter will shut down and remain inoperative until the
input voltage returns to
≈ 25 volts.
En ab le 2
Sh are
Trim
- V o ut
Return
+ V out
To
Loads
R
AD J
A F L50 xxD
7
12
+
-
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