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參數(shù)資料
| 型號： | LT1111IS8-5#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO8 |
| 封裝： | LEAD FREE, SOIC-8 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 237K |
| 代理商： | LT1111IS8-5#PBF |
13
LT1111
1111fd
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
Table 2. Inductor Manufacturers
MANUFACTURER
PART NUMBERS
Coiltronics Incorporated
CTX100-4 Series
6000 Park of Commerce Blvd.
Surface Mount
Boca Raton, FL 33487
407-241-7876
Toko America Incorporated
Type 8RBS
1250 Feehanville Drive
Mount Prospect, IL 60056
312-297-0070
Sumida Electric Co. USA
CD54
708-956-0666
CDR74
CDR105
Surface Mount
Using the Gain Block
The gain block (GB) on the LT1111 can be used as an error
amplifier, low-battery detector or linear post regulator.
The gain block itself is a very simple PNP input op amp with
an open collector NPN output. The negative input of the
gain block is tied internally to the 1.25V reference. The
positive input comes out on the SET pin.
Arrangement of the gain block as a low-battery detector
is straightforward. Figure 12 shows hookup. R1 and R2
need only be low enough in value so that the bias current
of the SET input does not cause large errors. 33k for R2
is adequate. R3 can be added to introduce a small amount
of hysteresis. This will cause the gain block to “snap”
when the trip point is reached. Values in the 1M to 10M
range are optimal. However, the addition of R3 will
change the trip point.
Table 3. Capacitor Manufacturers
MANUFACTURER
PART NUMBERS
Sanyo Video Components
OS-CON Series
1201 Sanyo Avenue
San Diego, CA 92073
619-661-6322
Nichicon America Corporation
PL Series
927 East State Parkway
Schaumberg, IL 60173
708-843-7500
Sprague Electric Company
150D Solid Tantalums
Lower Main Street
550D Tantalex
Sanford, ME 04073
207-324-4140
Matsuo
267 Series
714-969-2491
Surface Mount
LT1111 F12
VBAT
R1
R2
1.25V
REF
SET
GND
IN
V
LT1111
47k
5V
TO
PROCESSOR
+
–
A0
R3
R1 =
VLB – 1.25V
35.1
A
VLB = BATTERY TRIP POINT
R2 = 33k
R3 = 1.6M
Figure 12. Setting Low-Battery Detector Trip Point
Table 1. Component Selection for Common Converters
INPUT
OUTPUT
CIRCUIT
INDUCTOR
CAPACITOR
VOLTAGE
CURRENT (MIN)
FIGURE
VALUE
PART NUMBER
VALUE
NOTES
2 to 3.1
5
90mA
4
15
H
S CD75-750K
33
F*
2 to 3.1
5
10mA
4
47
H
S CD54-470K, C CTX50-1
10
F
2 to 3.1
12
30mA
4
15
H
S CD75-150K
22
F
2 to 3.1
12
10mA
4
47
H
S CD54-470K, C CTX50-1
10
F
5
12
90mA
4
33
H
S CD75-330K
22
F
5
12
30mA
4
47
H
S CD75-470K, C CTX50-1
15
F
6.5 to 11
5
50mA
5
15
H
S CD54-150K
47
F**
12 to 20
5
300mA
5
56
H
S CD105-560K, C CTX50-4
47
F**
20 to 30
5
300mA
5
120
H
S CD105-121K, C CTX100-4
47
F**
5
–5
75mA
6
56
H
S CD75-560K, C CTX50-4
47
F
12
–5
250mA
6
120
H
S CD105-121K, C CTX100-4
100
F**
S = Sumida
C = Coiltronics
* Add 47
from ILIM to VIN
** Add 220
from ILIM to VIN
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