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LT1871EMS-7-TR

更新时间： 2024-11-28 05:43:27
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
32页 456K
描述
High Input Voltage,Current Mode Boost, Flyback and SEPIC Controller

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LT1871EMS-7-TR 数据手册

 浏览型号LT1871EMS-7-TR的Datasheet PDF文件第2页浏览型号LT1871EMS-7-TR的Datasheet PDF文件第3页浏览型号LT1871EMS-7-TR的Datasheet PDF文件第4页浏览型号LT1871EMS-7-TR的Datasheet PDF文件第5页浏览型号LT1871EMS-7-TR的Datasheet PDF文件第6页浏览型号LT1871EMS-7-TR的Datasheet PDF文件第7页 
LTC1871-7  
High Input Voltage,  
Current Mode Boost,  
Flyback and SEPIC Controller  
DESCRIPTION  
FEATURES  
The LTC®1871-7 is a current mode, boost, flyback and  
SEPICcontrolleroptimizedfordriving6V-ratedMOSFETs  
inhighvoltageapplications.TheLTC1871-7worksequally  
well in low or high power applications and requires few  
componentstoprovideacompletepowersupplysolution.  
Theswitchingfrequencycanbesetwithanexternalresistor  
over a 50kHz to 1MHz range, and can be synchronized to  
an external clock using the MODE/SYNC pin. Burst Mode  
operation at light loads, a low minimum operating supply  
voltage of 6V and a low shutdown quiescent current of  
10μAmaketheLTC1871-7wellsuitedforbattery-operated  
systems. For applications requiring constant frequency  
operation, Burst Mode operation can be defeated using  
the MODE/SYNC pin. The LTC1871-7 is available in the  
10-lead MSOP package.  
n
Optimized for High Input Voltage Applications  
n
Wide Chip Supply Voltage Range: 6V to 36V  
n
Internal 7V Low Dropout Voltage Regulator  
Optimized for 6V-Rated MOSFETs  
n
Current Mode Control Provides Excellent  
Transient Response  
n
High Maximum Duty Cycle (92% Typ)  
n
2% RUN Pin Threshold with 100mV Hysteresis  
n
1% Internal Voltage Reference  
n
Micropower Shutdown: I = 10μA  
Q
n
Programmable Operating Frequency  
(50kHz to 1MHz) with One External Resistor  
n
Synchronizable to an External Clock Up to 1.3 × f  
OSC  
User-Controlled Pulse Skip or Burst Mode® Operation  
Output Overvoltage Protection  
n
n
n
n
Can be Used in a No R  
Small 10-Lead MSOP Package  
™ Mode for V < 36V  
SENSE  
DS  
PARAMETER  
LTC1871-7  
7.0V  
LTC1871  
5.2V  
INTV  
INTV  
INTV  
CC  
CC  
CC  
+
–
UV  
UV  
5.6V  
2.1V  
APPLICATIONS  
4.6V  
1.9V  
n
Telecom Power Supplies  
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.  
No R is a trademark of Linear Technology Corporation. All other trademarks are the  
n
42V Automotive Systems  
SENSE  
property of their respective owners.  
n
24V Industrial Controls  
IP Phone Power Supplies  
n
TYPICAL APPLICATION  
D3  
10BQ060  
V
OUT  
V
IN  
12V  
36V TO 72V  
3:1  
2.2μF  
100V  
X7R  
0.4A  
604k  
100k  
D1  
47μF  
16V  
X5R  
26.7k  
T1  
VP1-0076  
Q1  
FMMT625  
9.1V  
10Ω  
2.2nF  
RUN  
SENSE  
D2  
4148  
I
V
IN  
TH  
3.4k  
LTC1871-7  
INTV  
FB  
CC  
M1  
FDC2512  
FREQ  
GATE  
GND  
12.4k  
MODE/SYNC  
0.1μF  
X5R  
4.7μF  
X5R  
0.12Ω  
110k  
120k  
18717 F01  
Figure 1. Small, Nonisolated 12V Flyback Telecom Housekeeping Supply  
18717fc  
1
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