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LT8376

更新时间： 2024-09-26 14:57:55
品牌 Logo 应用领域
亚德诺 - ADI 驱动驱动器
页数 文件大小 规格书
32页 3486K
描述
集成Silent Switcher的60V、3A同步降压LED驱动器

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中文翻译

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LT8376 数据手册

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LT8376  
60V, 3A Synchronous Step-Down  
LED Driver with Silent Switcher  
FEATURES  
DESCRIPTION  
The LT®8376 is a monolithic, synchronous, step-down  
DC/DC converter that utilizes fixed-frequency, peak current  
control and provides PWM dimming for a string of LEDs.  
The LED current is programmed by an analog voltage or  
the duty cycle of pulses at the CTRL pin. An output voltage  
limit can be set with a resistor divider to the FB pin.  
n
1.5% LED Current Regulation  
n
2% Output Voltage Regulation  
n
5000:1 PWM Dimming at 100Hz  
128:1 Internal PWM Dimming  
n
n
Spread-Spectrum Frequency Modulation  
Silent Switcher® Architecture for Low EMI  
n
n
3.6V to 60V Input Voltage Range  
The switching frequency is programmable from 200kHz to  
2MHz by an external resistor at the RT pin or by an exter-  
nal clock at the SYNC/SPRD pin. With the optional spread  
spectrum frequency modulation enabled, the frequency  
varies from 100% to 125% to reduce EMI. The LT8376  
also includes a driver for an external, high side PMOS for  
PWM dimming and an internal PWM signal generator for  
analog control of PWM dimming when an external signal  
is not available.  
n
0V to 60V LED String Voltage  
n
3A, 60V Internal Switches  
n
200kHz to 2MHz with SYNC Function  
n
99.9% Maximum Duty Cycle  
n
20:1 Analog or Duty Cycle LED Current Control  
n
Open/Short LED Protection and Fault Indication  
Accurate LED Current Sense with Monitor Output  
Programmable UVLO  
n
n
n
Thermally Enhanced 28-Lead (4mm × 5mm) LQFN  
Additional features include an LED current monitor, an  
accurate EN/UVLO pin threshold, open-drain fault report-  
ing for open-circuit and short-circuit load conditions, and  
thermal shutdown. The LT8376 utilizes the proprietary  
Silent Switcher technology for very low EMI.  
APPLICATIONS  
n
Automotive Lighting  
n
Industrial and General Purpose Lighting  
All registered trademarks and trademarks are the property of their respective owners. Patents  
including 7199560, 7321203, 9596728, 9642200 and other patents pending.  
TYPICAL APPLICATION  
2A LED Driver with Internal PWM Dimming  
L2  
15µH  
V
IN  
43V TO 57V  
V
IN  
BST  
L1  
C
R
499k  
BST  
100nF  
EN2  
47µH  
4.7µF  
2A, 36V  
Internal PWM Dimming  
LED  
SW  
C
47µF  
EN/UVLO  
IN  
V
0.1µF  
R
15k  
OUT  
EN1  
SW  
50V/DIV  
R
FB2  
1M  
LT8376  
C
OUT  
4.7µF  
FB  
2A  
MAX  
PWMTG  
20V/DIV  
V
×2  
REF  
R
FB1  
24.9k  
R
REF1  
100k  
CTRL  
R
GND  
C
REF2  
100k  
REF  
PWM  
I
L
2.2µF  
2A/DIV  
ISP  
R
S
2.2µF  
INTVCC  
50mΩ  
I
LED  
2A/DIV  
R
FAULT  
100k  
ISN  
SYNC/SPRD  
PWMTG  
M1  
8376 TA01b  
20µs/DIV  
FAULT  
FAULT  
FERRITE  
BEAD  
ISMON  
ISMON  
128:1 PWM RATIO, 86Hz PWM FREQUENCY  
C
VCC  
2.2µF  
SS  
RT  
RP  
V
C
R
P
R
C
SS  
10n  
C
LED1  
169k  
56k  
86Hz  
100nF  
R
T
C
C
287k  
100pF  
LED12  
350kHz  
8376 TA01a  
Rev. A  
1
Document Feedback  
For more information www.analog.com  
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