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参数资料
| 型号： | LT1171ITTR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 5.5 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PZFM5 |
| 封装： | PLASTIC, TO-220, 5 PIN |
| 文件页数： | 3/20页 |
| 文件大小： | 278K |
| 代理商： | LT1171ITTR |
11
LT1170/LT1171/LT1172
117012ff
LCD Contrast Supply
C4
0.047
F
VOUT
–10V TO –26V
1170/1/2 TA04
R3
15k
OPTIONAL
SHUTDOWN
R2
100k
R1
200k
C1
1
F
TANTALUM
D1
1N914
C3
0.0047
F
C2***
2
F
TANTALUM
D2
VN2222
5V*
L1**
50
H
VBAT*
3V TO 20V
VIN
VC
FB
VSW
LT1172
E2
E1
GND
D3
*
**
***
D2, D3 = ER82.004 600mA SCHOTTKY. OTHER FAST SWITCHING TYPES MAY BE USED.
VIN AND BATTERY MAY BE TIED TOGETHER. MAXIMUM VALUE FOR VBAT IS EQUAL TO THE NEGATIVE OUTPUT + 1V. WITH HIGHER
BATTERY VOLTAGES, HIGHEST EFFICIENCY IS OBTAINED BY RUNNING THE LT1172 VIN PIN FROM 5V. SHUTTING OFF THE 5V SUPPLY
WILL AUTOMATICALLY TURN OFF THE LT1172. EFFICIENCY IS ABOUT 80% AT IOUT = 25mA.
R1, R2, R3 ARE MADE LARGE TO MINIMIZE BATTERY DRAIN IN SHUTDOWN, WHICH IS APPROXIMATELY VBAT /(R1 + R2 + R3).
FOR HIGH EFFICIENCY, L1 SHOULD BE MADE ON A FERRITE OR MOLYPERMALLOY CORE. PEAK INDUCTOR CURRENTS ARE ABOUT
600mA AT POUT = 0.7. INDUCTOR SERIES RESISTANCE SHOULD BE LESS THAN 0.4 FOR HIGH EFFICIENCY.
OUTPUT RIPPLE IS ABOUT 200mVP-P TO 400mVP-P WITH C2 = 2F TANTALUM. IF LOWER RIPPLE IS DESIRED, INCREASE C2, OR ADD
A 10
, 1F TANTALUM OUTPUT FILTER.
+
Driving High Voltage FET
(for Off-Line Applications, See AN25)
External Current Limit
1170/1/2 TA05
VIN
VSW
LT1170
GND
10V TO
20V
D1
+
D
G
Q1
1170/1/2 TA06
VX
D1
LT1170
GND
R2
≈ 2V
VC
R1
500
(Note that maximum output currents are divided by 2 for LT1171, by 4 for LT1172.)
TYPICAL APPLICATIO S
U
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1171M | 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 |
| LT1171MK | 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 |
| LT1171MK/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 |
| LT1172 | 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 |
| LT1172C | 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 |
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