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LT3795IFEPBF

更新时间： 2022-03-20 15:38:24
品牌 Logo 应用领域
LINEAR_DIMENSIONS 控制器
页数 文件大小 规格书
28页 438K
描述
110V LED Controller with Spread Spectrum Frequency Modulation

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LT3795IFEPBF 数据手册

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LT3795  
110V LED Controller with  
Spread Spectrum Frequency Modulation  
FeaTures  
DescripTion  
The LT®3795 is a DC/DC controller designed to regulate a  
constant-current or constant-voltage and is ideal for driv-  
ing LEDs. It drives a low side external N-channel power  
MOSFET from an internal regulated 7.7V supply. The fixed  
frequency and current mode architecture result in stable  
operation over a wide range of supply and output volt-  
ages.Spreadspectrumfrequencymodulation(SSFM)can  
be activated for improved electromagnetic compatibility  
(EMC) performance. The ground referred voltage FB pin  
serves as the input for several LED protection features,  
and also allows the converter to operate as a constant-  
voltage source. The maximum output current is set by an  
external resistor, and the output current amplifier has a rail-  
to-rail common mode range. The LT3795 also includes a  
separate input current sensing amplifier that is used to limit  
input current. The TG pin inverts and level shifts the PWM  
signal to drive the gate of the external PMOS. The PWM  
input provides LED dimming ratios of up to 3000:1, and the  
CTRL inputs provide additional analog dimming capability.  
n
3000:1 True Color PWM™ Dimming  
Wide Input Voltage Range: 4.5V to 110V  
Input and Output Current Reporting  
PMOS Switch Driver for PWM and Output Disconnect  
Internal Spread Spectrum Frequency Modulation  
±±2 Constant Voltage Regulation  
±32 Constant Current Regulation: 0V ꢀ V  
Programmable Input Current limit  
n
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n
n
n
n
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n
n
n
n
n
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ꢀ 110V  
OUT  
CTRL Inputs Linearly Adjust LED Current  
Adjustable Frequency: 100kHz to 1MHz  
Programmable Open LED Protection with OPENLED Flag  
Short-Circuit Protection and SHORTLED Flag  
Programmable Undervoltage Lockout with Hysteresis  
Soft-Start with Programmable Fault Restart Timer  
C/10 Detection for Battery Charging  
Available in ±8-Lead TSSOP Package  
applicaTions  
n
High Power LED, High Voltage LED  
n
Battery Chargers  
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, 73±1±03,  
7746300.  
n
Accurate Current Limited Voltage Regulators  
Typical applicaTion  
Short-Circuit Robust Boost LED Driver with Spread Spectrum Frequency Modulation  
Efficiency vs VIN  
V
22µH  
15mΩ  
IN  
100  
95  
8V TO 60V  
110V (TRANSIENT)  
63V OVLO  
2.2µF  
×3  
2.2µF  
×4  
499k  
115k  
1M  
EN/UVLO  
OVLO  
V
IN  
IVINP  
IVINN  
GATE  
90  
85  
80  
13.3k  
SENSE  
12.4k  
CTRL1  
CTRL2  
REF  
15mΩ  
GND  
LT3795  
V
PWM  
10nF  
PWM  
FB  
ISP  
75  
70  
IVINCOMP  
620mΩ  
RAMP  
INTV  
CC  
40  
60  
0
10  
20  
30  
(V)  
50  
47nF  
ISN  
TG  
V
100k  
100k  
IN  
3795 TA01b  
OPENLED  
OPENLED  
INTV  
CC  
INTV  
CC  
SHORTLED  
SHORTLED  
RT  
4.7µF  
V
ISMON  
SS  
C
87V LED  
400mA  
31.6k  
250kHz  
10k  
6.8nF  
0.1µF  
0.1µF  
3795 TA01a  
3795f  
1
For more information www.linear.com/LT3795  
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