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LT3956

更新时间： 2023-12-20 18:45:23
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
20页 1468K
描述
80VIN、80VOUT 恒定电流、恒定电压转换器

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中文翻译

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LT3956 数据手册

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LT3956  
80V , 80V  
IN  
OUT  
Constant-Current,  
Constant-Voltage Converter  
DescripTion  
FeaTures  
n
3000:1 True Color PWMTM Dimming  
The LT®3956 is a DC/DC converter designed to operate as  
a constant-current source and constant-voltage regulator.  
It is ideally suited for driving high current LEDs. It features  
an internal low side N-channel power MOSFET rated for  
84V at 3.3A and driven from an internal regulated 7.15V  
supply. The fixed frequency, current-mode architecture  
results in stable operation over a wide range of supply  
and output voltages. A ground referenced voltage FB pin  
serves as the input for several LED protection features,  
and also makes it possible for the converter to operate  
as a constant-voltage source. A frequency adjust pin  
allows the user to program the frequency from 100kHz  
to 1MHz to optimize efficiency, performance or external  
component size.  
n
Wide Input Voltage Range: 4.5V to 80V  
n
Output Voltage Up to 80V  
n
Internal 3.3A/84V Switch  
n
Constant-Current and Constant-Voltage Regulation  
n
250mV High Side Current Sense  
n
Drives LEDs in Boost, Buck Mode, Buck-Boost Mode,  
SEPIC or Flyback Topology  
n
Adjustable Frequency: 100kHz to 1MHz  
n
Open LED Protection  
n
n
n
n
n
n
nꢀ  
Programmable Undervoltage Lockout with Hysteresis  
Constant-Voltage Loop Status Pin  
PWM Disconnect Switch Driver  
CTRL Pin Adjusts High Side Current Sense Threshold  
Low Shutdown Current: <1µA  
Programmable Soft-Start  
Available in the 36-Lead (5mm × 6mm) QFN Package  
The LT3956 senses output current at the high side of the  
LED string. High side current sensing is the most flexible  
scheme for driving LEDs, allowing boost, buck mode or  
buck-boost mode configuration. The PWM input provides  
LED dimming ratios of up to 3000:1, and the CTRL input  
provides additional analog dimming capability.  
applicaTions  
n
High Power LED  
n
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Protected by U.S. Patents, including 7199560 and 7321203.  
Battery Charger  
n
Accurate Current Limited Voltage Regulator  
Typical applicaTion  
Efficiency vs VIN  
94% Efficient 25W White LED Headlamp Driver  
V
, 6V TO 60V  
IN  
D1  
22µH  
(80V TRANSIENT)  
100  
2.2µF  
s 2  
2.2µF  
s 5  
332k  
V
SW  
IN  
EN/UVLO  
PGND  
96  
92  
88  
100k  
V
ISP  
REF  
332k  
LT3956  
0.68Ω  
370mA  
CTRL  
ISN  
FB  
INTV  
CC  
40.2k  
1M  
100k  
VMODE  
PWM  
SS  
25W LED STRING  
16.2k  
84  
RT  
PWMOUT  
GND INTV  
V
C
CC  
80  
0
20  
60  
80  
40  
(V)  
28.7k  
375kHz  
34k  
4.7nF  
INTV  
CC  
V
IN  
4.7µF  
47nF  
M1  
3956 TA01b  
3956 TA01a  
3956f  
ꢀ
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中文翻译

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