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| 型号： | AME1085DCDT |
| 厂商： | AME, Inc. |
| 英文描述： | JT 6C 6#12 SKT WALL RECP |
| 中文描述： | 第3A低压差正电压稳压器 |
| 文件页数： | 5/14页 |
| 文件大小： | 103K |
| 代理商： | AME1085DCDT |
Analog Microelectronics, Inc.
5
AME1085
3A Low Dropout
Positive Voltage Regulator
n
Application Description
1. Output voltage adjustment
Like most regulators, the AME1085 regulates the
output by comparing the output voltage to an
internally generated reference voltage. On the
adjustable version, the V
REF
is available exter-
nally as 1.25V between V
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:
V
OUT
= V
REF
( 1 + ) + I
ADJ
x R2
On fixed versions of AME1085, the voltage di-
vider is provided internally.
R2
R1
Figure 3
2. Thermal protection
AME1085 has thermal protection which limits
junction temperature to 150
O
C. However, de-
vice
functionality is only guaranteed to a maxi-
mum junction temperature of +125
O
C.
The power dissipation and junction temperature
for AME1085 in TO-220 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
AME1085 is protected against overload condi-
tions. Current protection is triggered at typi-
cally 4.5A.
4. Stability and load regulation
AME1085 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 tanta-
lum or 50
μ
F aluminum electrolytic is sufficient.
Note: It is important that the ESR for this ca-
pacitor does not exceed 0.5
.
The output capacitor dose not have a theoreti-
cal upper limit and increasing its value will in-
creasestability. C
OUT
= 100
μ
F or more is typi-
cal for high current regulator design.
For the adjustable version, the best load regu-
lation is accomplished when the top of the
resistor divider (R1) is connected directly to the
output pin of the AME1085. When so con-
nected, R
is not multiplied by the divider ratio.
For fixed output versions, the top of R1 is in-
ternally connected to the output and ground
pin can be connected to low side of the load.
Figure 4
V
OUT
= V
REF
(1+R2
R1
) + I
ADJ
x R2
OUT
ADJ
IN
V
REF
I
ADJ
50
A
V
IN
V
OUT
R1
R2
C
1
OUT
ADJ
IN
V
IN
R1
R2
R
L
R
Parasitic
Line Resistance
Connect
R2 to load
(Connect R1 to case)
相关PDF资料 |
PDF描述 |
|---|---|
| AME1085DCDT-3 | JT 8C 8#16 SKT WALL RECP |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AME1085DCDT-3 | 制造商:AME 制造商全称:Analog Microelectronics 功能描述:3A Low Dropout Positive Voltage Regulator |
| ame1085dcdtz | 制造商:Analog Microelectronic Inc (AME) 功能描述:3A Low Dropout Positive Voltage Regulator- TO-263-2 |
| AME1085MCT | 制造商:AME 功能描述:AME1085MCT 3A 3.3 LOW DROPOUT POSITIVE VOLTAGE REGULATOR /GOI |
| AME1085MCTZ | 制造商:AME 功能描述:AME1085MCTZ 3.3V LOW DROPOUT POSITIVE VOLTAGE REGULATOR /AOI |
| AME1086 | 制造商:AME 制造商全称:Analog Microelectronics 功能描述:1.5A Low Dropout Positive Voltage Regulator |
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