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| 型號： | REG1117FA |
| 英文描述： | REFLECTIVE PHOTOSENSOR SMD |
| 中文描述： | 800mA電流和1A低壓差穩(wěn)壓積極在1.8V，2.5V，工作在2.85V，3.3V和5V和可調(diào) |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 264K |
| 代理商： | REG1117FA |
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SBVS001D OCTOBER 1992 REVISED JULY 2004
www.ti.com
8
TYPICAL CHARACTERISTICS (continued)
At TA = +25
°
C, all models, unless otherwise noted.
LOADTRANSIENTRESPONSE
0.1
0
0.1
0.5
0
0.5
L
O
D
0
20
40
60
80
100
Time(
μ
s)
C
IN
=10
μ
F
C
= 10
μ
F
Tantalum
V
= 4.25V
Preload=0.1A
LINETRANSIENTRESPONSE
60
40
20
0
20
40
5.25
4.25
3.25
I
O
D
0
20
40
60
80
100 120 140 160 180 200
Time(
μ
s)
C
IN
=1
μ
F
C
OUT
=10
μ
FTantalum
I
OUT
=0.1A
APPLICATIONS INFORMATION
Figure 1 shows the basic hookup diagram for fixed-voltage
models. All models require an output capacitor for proper
operation, and for improving high-frequency load
regulation; a 10
μ
F tantalum capacitor is recommended.
Aluminum electrolytic types of 50
μ
F or greater can also be
used. A high-quality capacitor should be used to assure
that the ESR (Effective Series Resistance) is less than
0.5
.
REG1117
V
O
V
IN
10
μ
F
Tantalum
10
μ
F
Tantalum
+
+
Figure 1. Fixed-Voltage Model—Basic
Connections
Figure 2 shows a hookup diagram for the adjustable
voltage model. Resistor values are shown for some
commonly-used output voltages. Values for other voltages
can be calculated from the equation shown in Figure 2. For
best load regulation, connect R
1
close to the output pin and
R
2
close to the ground side of the load as shown.
THERMAL CONSIDERATIONS
The REG1117 has current limit and thermal shutdown
circuits that protect it from overload. The thermal shutdown
activates at approximately T
J
= 165
°
C. For continuous
operation, however, the junction temperature should not
be allowed to exceed 125
°
C. Any tendency to activate the
thermal shutdown in normal use is an indication of an
inadequate heat sink or excessive power dissipation. The
power dissipation is equal to:
P
D
= (V
IN
– V
OUT
) I
OUT
The junction temperature can be calculated by:
T
J
= T
A
+ P
D
(
JA
)
where T
A
is the ambient temperature, and
junction-to-ambient thermal resistance.
JA
is the
REG1117
(Adj)
V
IN
V
O
C
2
10
μ
F
C
1
10
μ
F
C
3(1)
10
μ
F
+
+
+
R
1
R
2
Load
3
2
1
NOTES: (1) C
3
optional. Improves highrequency line rejection. (2) Resistors are standard 1% values.
V
O
=
x (1.25V) + (50
μ
A) (R
2
)
R
1
R
1
+ R
2
This term is negligible with
proper choice of values
see
table at right.
V
(V)
1.25
1.5
2.1
2.85
3
3.3
5
10
R
1
R
2
(
)
(2)
Open
750
158
169
137
115
113
113
(
)
(2)
Short
147
107
215
191
187
340
787
Figure 2. Adjustable-Voltage Model—Basic Connections
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| REG1117FA/2K5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Adjustable Voltage Regulator |
| REG1117FA/500 | 功能描述:低壓差穩(wěn)壓器 - LDO 800mA & 1A LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| REG1117FA/500G3 | 功能描述:低壓差穩(wěn)壓器 - LDO 800mA & 1A LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| REG1117FA/KTTT | 制造商:BB 制造商全稱:BB 功能描述:800mA and 1A Low Dropout Positive Regulator 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable |
| REG1117FA-1.8 | 制造商:Texas Instruments 功能描述: |
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