参数资料
| 型号： | LT1172MJ8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 8CERDIP |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压），反相，Cuk，回扫，正向转换器 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 40 V |
| 输入电压： | 3 V ~ 40 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 1.25A |
| 同步整流器： | 无 |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-CDIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 供应商设备封装： | 8-CERDIP |
LT1170/LT1171/LT1172
TYPICAL APPLICATIONS
(Note that maximum output currents are divided by 2 for LT1171, by 4 for LT1172.)
LCD Contrast Supply
5V*
L1**
V IN
50μH
V BAT *
3V TO 20V
E2
V SW
+
C1
LT1172
R2
R1
D1
1N914
1μF
TANTALUM
OPTIONAL
SHUTDOWN
E1
VN2222
GND
V C
FB
C4
0.047μF
100k
R3
15k
200k
C3
0.0047μF
D3
D2
V OUT
–10V TO –26V
C2***
2μF
TANTALUM
D2, D3 = ER82.004 600mA SCHOTTKY. OTHER FAST SWITCHING TYPES MAY BE USED.
* V IN AND BATTERY MAY BE TIED TOGETHER. MAXIMUM VALUE FOR V BAT IS EQUAL TO THE |NEGATIVE OUTPUT | + 1V. WITH HIGHER
BATTERY VOLTAGES, HIGHEST EFFICIENCY IS OBTAINED BY RUNNING THE LT1172 V IN PIN FROM 5V. SHUTTING OFF THE 5V SUPPLY
WILL AUTOMATICALLY TURN OFF THE LT1172. EFFICIENCY IS ABOUT 80% AT I OUT = 25mA.
R1, R2, R3 ARE MADE LARGE TO MINIMIZE BATTERY DRAIN IN SHUTDOWN, WHICH IS APPROXIMATELY V BAT /(R1 + R2 + R3).
** FOR HIGH EFFICIENCY, L1 SHOULD BE MADE ON A FERRITE OR MOLYPERMALLOY CORE. PEAK INDUCTOR CURRENTS ARE ABOUT
600mA AT P OUT = 0.7Ω. INDUCTOR SERIES RESISTANCE SHOULD BE LESS THAN 0.4Ω FOR HIGH EFFICIENCY.
*** OUTPUT RIPPLE IS ABOUT 200mV P-P TO 400mV P-P WITH C2 = 2μF TANTALUM. IF LOWER RIPPLE IS DESIRED, INCREASE C2, OR ADD
A 10Ω, 1μF TANTALUM OUTPUT FILTER.
Driving High Voltage FET
(for Off-Line Applications, See AN25)
1170/1/2 TA04
External Current Limit
G
D
Q1
V X
LT1170
10V TO
20V
+
V IN
LT1170
V SW
D1
R2
R1
500Ω
≈ 2V
D1
GND
V C
GND
1170/1/2 TA06
1170/1/2 TA05
117012fg
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1172MK | 制造商:Linear Technology 功能描述: |
| LT1172MK/883 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Current-Mode SMPS Controller |
| LT1172S8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators |
| LT1173 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower DC/DC Converter Adjustable and Fixed 5V, 12V |
| LT1173-12 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower DC/DC Converter Adjustable and Fixed 5V, 12V |
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