參數(shù)資料
型號(hào): LT1173
廠商: Linear Technology Corporation
英文描述: Micropower DC/DC Converter Adjustable and Fixed 5V, 12V(微功耗,固定輸出12V或5V及可調(diào)輸出,DC/DC變換器(工作于步升和步降兩種模式))
中文描述: 微功率DC / DC轉(zhuǎn)換可調(diào)和固定5V,12V的(微功耗,固定輸出12V的或5V的及可調(diào)輸出,直流/直流變換器(工作于步升和步降兩種模式))
文件頁(yè)數(shù): 11/16頁(yè)
文件大?。?/td> 256K
代理商: LT1173
LT1173
11
U
S
A
O
PPLICATI
U
U
Using the Gain Block
The gain block (GB) on the LT1173 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 1.245V reference. The posi-
tive 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. 100k
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-10M range are
optimal. The addition of R3 will change the trip point,
however.
Table 1. Component Selection for Common Converters
INPUT
OUTPUT
VOLTAGE
VOLTAGE
2.0-3.1
5
2.0-3.1
5
2.0-3.1
12
2.0-3.1
12
5
12
5
12
5
15
5
30
6.5-9.5
5
12-20
5
20-30
5
5
–5
12
–5
–5
5
–5
12
OUTPUT
CURRENT (MIN)
90mA
10mA
50mA
10mA
90mA
30mA
50mA
25mA
50mA
300mA
300mA
75mA
250mA
150mA
75mA
CIRCUIT
FIGURE
5
5
5
5
5
5
5
5
6
6
6
7
7
8
8
INDUCTOR
VALUE
47
μ
H
220
μ
H
47
μ
H
150
μ
H
120
μ
H
150
μ
H
120
μ
H
100
μ
H
47
μ
H
220
μ
H
470
μ
H
100
μ
H
470
μ
H
100
μ
H
100
μ
H
INDUCTOR
PART NUMBER
G GA10-472K, C CTX50-1
G GA10-223K, C CTX
G GA10-472K, C CTX50-1
G GA10-153K
G GA10-123K
G GA10-153K
G GA10-123K C CTX100-4
G GA10-103K, C CTX100-4
G GA10-472K, C CTX50-1
G GA20-223K
G GA20-473K
G GA10-103K, C CTX100-4
G GA40-473K
G GA10-103K, C CTX100-4
G GA10-103K, C CTX100-4
CAPACITOR
VALUE
100
μ
F
22
μ
F
47
μ
F
22
μ
F
100
μ
F
47
μ
F
47
μ
F
10
μ
F, 50V
100
μ
F
220
μ
F
470
μ
F
100
μ
F
220
μ
F
220
μ
F
47
μ
F
NOTES
*
*
**
**
**
**
**
**
G = Gowanda
C = Coiltronics
* Add 68
from I
LIM
to V
IN
** Add 100
from I
LIM
to V
IN
LT1173 TA16
V
BAT
R1
R2
1.245V
REF
SET
GND
IN
V
LT1173
100k
+5V
TO
PROCESSOR
R1 = V
LB
– 1.245V
11.7
μ
A
V
LB
= BATTERY TRIP POINT
R2 = 100k
R3 = 4.7M
+
AO
R3
Figure 12. Setting Low Battery Detector Trip Point
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