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参数资料
| 型号： | LT1173CS8#TR |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST INV ADJ 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压），反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 50 V |
| 输入电压： | 2 V ~ 30 V |
| 频率 - 开关： | 23kHz |
| 电流 - 输出： | 400mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
LT1173
A PPLICATI
Using the Gain Block
S I FOR ATIO
+5V
The gain block (GB) on the LT1173 can be used as an error
amplifier, low battery detector or linear post regulator. The
R1
V IN
LT1173
100k
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-
V BAT
1.245V
REF
SET
–
+
AO
TO
PROCESSOR
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
R2
GND
R3
R1 = LB
only be low enough in value so that the bias current of the
SET input does not cause large errors. 100k ? for R2 is
V – 1.245V
11.7 μ A
adequate. R3 can be added to introduce a small amount of
hysteresis. This will cause the gain block to “snap” when
V LB = BATTERY TRIP POINT
R2 = 100k ?
R3 = 4.7M ?
LT1173 ? TA16
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
Figure 12. Setting Low Battery Detector Trip Point
INPUT
OUTPUT
OUTPUT
CIRCUIT
INDUCTOR
INDUCTOR
CAPACITOR
VOLTAGE
2.0-3.1
2.0-3.1
2.0-3.1
2.0-3.1
5
5
5
5
6.5-9.5
12-20
20-30
5
12
–5
–5
VOLTAGE
5
5
12
12
12
12
15
30
5
5
5
–5
–5
5
12
CURRENT (MIN)
90mA
10mA
50mA
10mA
90mA
30mA
50mA
25mA
50mA
300mA
300mA
75mA
250mA
150mA
75mA
FIGURE
5
5
5
5
5
5
5
5
6
6
6
7
7
8
8
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
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
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
11
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