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參數(shù)資料
| 型號： | AFL5008S |
| 英文描述： | Micropower, Regulated 5V Charge Pump DC/DC Converter; Package: SO; No of Pins: 8; Temperature Range: 0°C to +70°C |
| 中文描述： | 高可靠性的DC - DC轉(zhuǎn)換器標(biāo)準(zhǔn)單在冬季兩項包 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 82K |
| 代理商： | AFL5008S |
8
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AFL50XXD Series
Input Filter
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.
Undervoltage Lockout
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.
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
5.5
5.4
5.3
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.583
R
adj
0
12.5K
33.3K
75K
200K
∞
190K
65K
23K
2.5K
0
V
out
12.5
12.4
12.3
12.2
12.1
12.0
11.7
11.3
10.8
10.6
10.417
R
adj
0
47.5K
127K
285K
760K
∞
975K
288K
72.9K
29.9K
0
V
out
15.5
15.4
15.3
15.2
15.1
15.0
14.6
14.0
13.5
13.0
12.917
R
adj
0
62.5K
167K
375K
1.0M
∞
1.2M
325K
117K
12.5K
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.
0.75μH
Pin 1
Pin 2
2.7μfd
Enable 2
Share
Trim
- Vout
Return
+ Vout
To
Loads
R
ADJ
AFL50xxD
7
12
+
-
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AFL5008SW | Micropower, Regulated 5V Charge Pump DC/DC Converter; Package: SO; No of Pins: 8; Temperature Range: -40°C to +85°C |
| AFL5008SX | DC to DC Converter |
| AFL5008SY | DC to DC Converter |
| AFL5008SZ | DC to DC Converter |
| AFL5009S | Hi-Rel DC-DC Standard Single Converter in a AFL package |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AFL5008SW | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DC to DC Converter |
| AFL5008SW/CH | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DC to DC Converter |
| AFL5008SW/ES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DC to DC Converter |
| AFL5008SW/HB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DC to DC Converter |
| AFL5008SW-CH | 制造商:IRF 制造商全稱:International Rectifier 功能描述:ADVANCED ANALOG HIGH RELIABILITY HYBRID DC/DC CONVERTERS |
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