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AME1117DCBT Datasheet(PDF) 10 Page - Analog Microelectronics

No. de pieza AME1117DCBT
Descripción Electrónicos  1A Low Dropout Positive Voltage Regulator
Download  19 Pages
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Fabricante Electrónico  AME [Analog Microelectronics]
Página de inicio  http://www.ame.com.tw/
Logo AME - Analog Microelectronics

AME1117DCBT Datasheet(HTML) 10 Page - Analog Microelectronics

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AME, Inc.
10
1A Low Dropout
Positive Voltage Regulator
AME1117
Rev.S.02
1. Output Voltage Adjustment
Like most regulators, the AME1117 regulates the out-
put by comparing the output voltage to an internally gen-
erated reference voltage. On the adjustable version, the
V
REF is available externally as 1.25V between VOUT 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 = VREF ( 1 +
) + I
ADJ x R2
On fixed versions of AME1117, the voltage divider is
provided internally.
n Application Description
R2
R1
2. Thermal Protection
AME1117 has thermal protection which limits junction
temperature to 150oC. However, device functionality is
only guaranteed to a maximum junction temperature of
+125oC.
The power dissipation and junction temperature for
AME1117 is given by
P
D = (VIN - VOUT) x IOUT
T
JUNCTION = TAMBIENT + ( PD x θJA)
Note: T
JUNCTION must not exceed 125
oC
3. Current Limit Protection
AME1117 is protected against overload conditions. Cur-
rent protection is triggered at typically 1.5A.
4. Stability and Load Regulation
AME1117 requires a capacitor from V
OUT to GND to pro-
vide compensation feedback to the internal gain stage.
This is to ensure stability at the output terminal. Typi-
cally, a 10
µF tantalum or 50µF aluminum electrolytic is
sufficient.
(Note: It is important that the ESR for this capacitor does not ex-
ceed 0.5
Ω.)
The output capacitor does not have a theoretical upper
limit and increasing its value will increase stability. C
OUT
= 100
µF or more is typical for high current regulator de-
sign.
For the adjustable version, the best load regulation is
accomplished when the top of the resistor divider (R1) is
connected directly to the output pin of the AME1117.
When so connected, R
P is not multiplied 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.
OUT
ADJ
IN
V
IN
R1
R2
R
L
R
P
Parasitic
Line Resistance
Connect
R2 to load
(Connect R1 to case)
V
OUT = VREF (1+
R2
R1
) + I
ADJ x R2
OUT
ADJ
IN
V
REF
I
ADJ
55
µA
V
IN
V
OUT
R1
R2
C
1


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