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参数资料
| 型号： | AME1117DCGT |
| 厂商： | AME, Inc. |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| 中文描述： | 5.0放大器正电压稳压器 |
| 文件页数： | 9/15页 |
| 文件大小： | 128K |
| 代理商： | AME1117DCGT |
Analog Microelectronics, Inc.
9
AME1117
1A Low Dropout Positive
Voltage Regulator
n
Application Descriptions
Like most regulators, the AME1117 regulates the
output by comparing the output voltage to an inter-
nally generated reference voltage. On the adjust-
able version, the V
REF
is available externally as
1.25V between V
OUT
and ADJ. The voltage ratio
formed by R1 and R2 should be set to conduct
10mA (minimum output load). The output voltage
is given by the following equation:
1. Output voltage adjustment
V
OUT
= V
REF
(1+R2
R1
) + I
ADJ
x R2
On fixed versions of AME1117, the voltage divider
is provided internally.
Figure 4
2. Thermal protection
AME1117 has thermal protection which limits
junction temperature to 150
O
C. However, device
functionality is only guaranteed to a maximum
junction temperature of +125
O
C.
The power dissipation and junction temperature
for AME1117 in DPAK package are given by
P
D
= (V
IN
- V
OUT
) x I
T
JUNCTION
= T
AMBIENT
+ ( P
D
x
θ
JA
)
Note: T
JUNCTION
must not exceed 125
O
C
3. Current Limit Protection
AME1117 is protected against overload conditions.
Current protection is triggered at typically 1.5A.
AME1117 requires a capacitor from V
OUT
to GND
to provide compensation feedback to the internal
gain stage. This is to ensure stability at the output
terminal. Typically, a 10
μ
F tantalum or 50
μ
F alu-
minum electrolytic is sufficient.
Note: It is important that the ESR for this
capacitor does not exceed 0.5
.
The output capacitor does not have a theoretical
upper limit and increasing its value will increase
stability. C
OUT
= 100
μ
F or more is typical for high
current regulator design.
For the adjustable version, the best load regulation
is accomplished when the top of the resistor di-
vider (R1) is connected directly to the output pin of
the AME1117. When so connected, R
P
is not mul-
tiplied by the divider ratio.
For fixed output versions, the top of R1 is internally
connected to the output. The ground pin can be
connected to the low side of the load in order to
eliminate ground loop errors.
4. Stability and Load Regulation
Figure 5
C
1
V
OUT
= V
REF
(1+R2
R1
) + I
ADJ
x R2
OUT
ADJ
IN
V
REF
I
ADJ
50
μ
A
V
IN
V
OUT
R1
R2
OUT
ADJ
IN
V
IN
R1
(Connect
R1 to case)
R2
R
L
R
Parasitic
Line Resistance
Connect
R2 to load
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相关代理商/技术参数 |
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|---|---|
| AME1117DCGTZ | 制造商:AME 制造商全称:Analog Microelectronics 功能描述:1A Low Dropout Positive Voltage Regulator |
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| AME1117ECCT | 制造商:AME 制造商全称:Analog Microelectronics 功能描述:1A Low Dropout Positive Voltage Regulator |
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