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參數(shù)資料
| 型號(hào)： | REG1117FA-5.0 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 固定正電壓?jiǎn)温份敵鯨DO穩(wěn)壓器 |
| 英文描述： | 5 V FIXED POSITIVE LDO REGULATOR, 1.55 V DROPOUT, PSSO3 |
| 封裝： | PLASTIC, TO-263, D2PAK-3 |
| 文件頁數(shù)： | 21/22頁 |
| 文件大小： | 655K |
| 代理商： | REG1117FA-5.0 |
REG1117
REG1117A
SBVS001D OCTOBER 1992 REVISED JULY 2004
www.ti.com
8
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, all models, unless otherwise noted.
LOAD TRANSIENT RESPONSE
0.1
0
0.1
0.5
0
0.5
Loa
d
C
u
rr
e
nt
(A
)
Ou
tp
u
t
V
o
lta
g
e
D
e
vi
at
io
ns
(V
)
0
2040
6080
100
Time (
s)
C
IN =10F
COUT =10F
Tantalum
V
IN =4.25V
Preload = 0.1A
LINE TRANSIENT RESPONSE
60
40
20
0
20
40
5.25
4.25
3.25
Inpu
t
V
o
lta
ge
(V
)
O
u
tput
V
o
ltag
e
De
vi
a
tio
n
(m
V
)
0
20
40
60
80
100 120 140 160 180 200
Time (
s)
C
IN =1F
C
OUT =10FTantalum
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
F tantalum capacitor is recommended.
Aluminum electrolytic types of 50
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
F
Tantalum
10
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 R1 close to the output pin and
R2 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 TJ = 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:
PD = (VIN – VOUT) IOUT
The junction temperature can be calculated by:
TJ = TA + PD (
qJA)
where TA is the ambient temperature, and qJA is the
junction-to-ambient thermal resistance.
REG1117
(Adj)
V
IN
V
O
C
2
10
F
C
1
10
F
C
3
(1)
10
F
+
R
1
R
2
Load
32
1
NOTES: (1) C
3 optional. Improves highfrequency line rejection. (2) Resistors are standard 1% values.
V
O =
x (1.25V) + (50
A) (R
2)
R
1
R
1 +R2
This term is negligible with
proper choice of values
see
table at right.
V
OUT
R
1
R
2
(V)(
)(2)
(
)(2)
1.25
Open
Short
1.5
750
147
2.1
158
107
2.85
169
215
3
137
191
3.3
115
187
5
113
340
10
113
787
Figure 2. Adjustable-Voltage Model—Basic Connections
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