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LT3955

更新时间： 2024-11-23 12:25:43
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
24页 425K
描述
40VIN LED Converter with Internal PWM Generator Wide VIN Range: 4.5V to 40V

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LT3955 数据手册

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LT3954  
40V LED Converter with  
IN  
Internal PWM Generator  
FEATURES  
DESCRIPTION  
n
3000:1 True Color PWM™ Dimming for LEDs  
The LT®3954 is a DC/DC converter designed to operate as  
aconstant-currentsourceandconstant-voltageregulator.  
It features an internal low side N-channel MOSFET rated  
for 40V/5A. The LT3954 is ideally suited for driving high  
current LEDs, but also has features to make it suitable  
for charging batteries and supercapacitors. The fixed  
frequency, current mode architecture results in stable  
operationoverawiderangeofsupplyandoutputvoltages.  
A voltage feedback 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 V Range: 4.5V to 40V  
IN  
n
n
n
n
Rail-to-Rail Current Sense Range: 0V to 40V  
Internal 40V/5A Switch  
Programmable PWM Dimming Signal Generator  
Constant Current ( 3%ꢀ and Constant-Voltage  
( 2%ꢀ Regulation  
n
n
Accurate Analog Dimming  
Drives LEDs in Boost, SEPIC, CUK, Buck Mode,  
Buck-Boost Mode, or Flyback Configuration  
Output Short-Circuit Protected Boost  
Open LED Protection and Reporting  
Adjustable Switching Frequency: 100kHz to 1MHz  
n
n
n
n
n
n
n
Programmable V UVLO with Hysteresis  
IN  
C/10 Indication for Battery Chargers  
Low Shutdown Current: <1µA  
Thermally Enhanced 5mm × 6mm QFN Package  
The LT3954 senses output current at the high side or at  
the low side of the load. The internal PWM generator can  
be configured to self-oscillate at fixed frequency with duty  
ratio programmable from 4% to 96%. When driven by an  
external signal, the PWM input provides LED dimming  
ratios of up to 3000:1. The CTRL input provides additional  
analog dimming capability.  
APPLICATIONS  
n
High Power LEDs  
n
Output Short-Circuit Protected Boost  
n
Battery and SuperCap Chargers  
Accurate Current Limited Voltage Regulators  
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, 7321203.  
n
TYPICAL APPLICATION  
95% Efficiency 20W Boost LED Driver with Internal PWM Dimming  
22µH  
V
IN  
5V TO 30V  
4.7µF  
×3  
499k  
147k  
4.7µF  
V
SW  
IN  
EN/UVLO  
PWM Dimming Waveforms at  
Various DIM Voltage Settings  
PGND  
V
ISP  
ISN  
REF  
1M  
LT3954  
V
= 8V  
PWM  
DIM  
DC  
0.38Ω  
650mA  
= 97.2%  
CTRL  
INTV  
CC  
V
= 3.87V  
PWM  
DIM  
DC  
165k  
I
= 50%  
LED  
0.65A/DIV  
1M  
100k  
20W LED STRING  
V
= 1.47V  
= 10%  
DIM  
DC  
FB  
(CURRENT DERATED  
VMODE  
DIM/SS  
PWM  
RT  
PWM  
124k  
FOR V < 9V)  
IN  
37.4k  
DIM  
V
= 0V  
PWM  
DIM  
DC  
SYNC  
PWMOUT  
GND GNDK INTV  
CC  
= 2.8%  
3954 TA01b  
0.5ms/DIV  
V
V
= 24V  
LED  
V
IN  
C
28.7k  
= 32V  
10nF  
350kHz  
INTV  
CC  
5.1k  
4.7nF  
3954 TA01a  
47nF  
300Hz  
1µF  
NOTE: GND, GNDK AND SIGNAL LEVEL COMPONENTS MUST BE CONNECTED EXTERNALLY AS SHOWN.  
AN INTERNAL CONNECTION BETWEEN GNDK AND PGND PINS PROVIDES GROUNDING TO THE SUPPLY  
3954f  
1
For more information www.linear.com/3954  
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