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參數(shù)資料
| 型號： | GM1117ATA3R |
| 廠商： | American Power Management Inc. |
| 英文描述： | 1.0A LOW DROPOUT PRECISION LINEAR REGULATORS |
| 中文描述： | 安培率低壓差線性穩(wěn)壓精度 |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 190K |
| 代理商： | GM1117ATA3R |
Output Voltage Sensing
The GM1117 are three terminal regulators. For which,
they cannot provide true remote load sensing. Load
regulation is limited by the resistance of the conductors
connecting the regulator to the load. For best results
the GM1117 should be connected are as shown in
Figure 3.
Calculating Power Dissipation and Heat
Sink Requirements
The GM1117 precision linear regulators include thermal
shutdown and current limit circuitry to protect the de-
vices. However, high power regulators normally oper-
ate at high junction temperatures. It is important to cal-
culate the power dissipation and junction temperatures
accurately to be sure that you use and adequate heat
sink. The case is connected to V
on the GM1117,
OUT
and electrical isolation may be required for some appli-
cations. Thermal compound should always be used
with high current regulators like the GM1117.
GM1117-3.3
V
IN
V
OUT
R
LOAD
R
C
GND
V
IN
Conductor
Parasitic
Resistance
(a) Fixed Version
(b) Adjustable Version
GM1117-Adj
ADJ
V
OUT
V
IN
V
IN
R
C
R
LOAD
R1
R2
(a),(b)
Figure 3
Conductor Parasitic Resistance Effects are
Minimized by this Grounding Scheme For Fixed
and Adjustable Output Regulators
G
M
1
7
Protection Diodes
When large external capacitors are used with most
linear regulator, it is wise to add protection diodes. If
the input voltage of the regulator is shorted, the out-
put capacitor will discharge into the output of the reg-
ulator. The discharge current depends on the value
of capacitor, output voltage, and rate at which V
IN
drops.
In the GM1117 linear regulators, the discharge path
is through a large junction, and protection diodes are
normally not needed. However, damage can occur if
the regulator is used with large output capacitance
values and the input voltage is instantaneously
shorted to ground. In this case, a diode connected
as shown above in Figure 2.
(a),(b)
Figure 2
Protection Diode Scheme for
Large Output Capacitors
(a) Fixed Version
(b) Adjustable Version
V
IN
V
OUT
ADJ
GM1117-Adj
ADJ
V
IN
V
OUT
C1
C2
R1
R2
GM1117-3.3
GND
V
IN
V
OUT
C1
IN4002
C2
V
IN
V
OUT
IN4002
Conductor
Parasitic
Resistance
A
MICROELECTRONICS
GM1117
1.0A LOW DROPOUT PRECISION LINEAR REGULATORS
Power Management
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| GM1117ATB3T | 1.0A LOW DROPOUT PRECISION LINEAR REGULATORS |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| GM1117-ATA3R | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:1.0A LOW DROPOUT PRECISION LINEAR REGULATORS |
| GM1117ATA3T | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:1.0A LOW DROPOUT PRECISION LINEAR REGULATORS |
| GM1117-ATA3T | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:1.0A LOW DROPOUT PRECISION LINEAR REGULATORS |
| GM1117ATB3R | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:1.0A LOW DROPOUT PRECISION LINEAR REGULATORS |
| GM1117ATB3T | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:1.0A LOW DROPOUT PRECISION LINEAR REGULATORS |
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