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LT3942

更新时间： 2024-11-27 14:57:43
品牌 Logo 应用领域
亚德诺 - ADI 升压转换器驱动驱动器
页数 文件大小 规格书
32页 2356K
描述
36V、2A同步降压-升压转换器和LED驱动器

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中文翻译

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LT3942 数据手册

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LT3942  
36V, 2A Synchronous Buck-Boost  
Converter and LED Driver  
FEATURES  
DESCRIPTION  
The LT®3942 is a monolithic 4-switch synchronous buck-  
boost converter with constant voltage and constant cur-  
rent regulation, suitable for both voltage regulator and  
LED driver applications. The part can regulate the out-  
put voltage, or input/output current with input voltages  
above, below, or equal to the output voltage. The propri-  
etary peak-buck peak-boost current mode control scheme  
allows adjustable and synchronizable 300kHz to 2MHz  
fixed frequency operation, or internal 25% triangle spread  
spectrum operation for low EMI. The LT3942 covers 3V to  
36V input and 0V to 36V output with seamless low-noise  
mode transition.  
n
4-Switch Single Inductor Architecture Allows V  
IN  
Above, Below or Equal to V  
OUT  
n
n
n
n
n
n
n
n
n
Constant Voltage and Constant Current Regulation  
Proprietary Peak-Buck Peak-Boost Current Mode  
3V to 36V Input Voltage Range  
0V to 36V Output Voltage Range  
1ꢀ.% Output Voltage Regulation  
3% Output Current Regulation  
5000:1 External and 128:1 Internal PWM Dimming  
Open and Short LED Protection with Fault Reporting  
300kHz to 2MHz Fixed Switching Frequency with  
External Frequency Synchronization  
n
n
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Flicker-Free Spread Spectrum for Low EMI  
Available in 28-Lead QFN (4mm × 5mm)  
AEC-Q100 Qualified for Automotive Applications  
For voltage regulator applications, the LT3942 provides  
input or output current monitor. For LED driver applica-  
tions, it provides current regulation with up to 128:1 inter-  
nal and 5000:1 external PWM dimming using an optional  
high-side PMOS switch. Fault protection is also provided  
to detect output short-circuit condition and open or short  
LED condition.  
APPLICATIONS  
n
Voltage Regulator with Accurate Current Limit  
n
General Purpose LED Driver  
All registered trademarks and trademarks are the property of their respective owners.  
n
Automotive and Industrial Lighting  
TYPICAL APPLICATION  
93% Efficient, 12W (12V, 1A) 2MHz Buck-Boost LED Driver  
0.1µF  
0.1µF  
3.3µH  
Efficiency vs VIN  
100  
95  
90  
85  
80  
75  
70  
BST1 SW1  
PV  
IN  
SW2 BST2  
100mΩ  
V
IN  
PV  
OUT  
IN  
8V TO 36V  
V
BUCK  
499k  
115k  
1M  
1M  
10µF  
10µF  
BOOST  
EN/UVLO  
OVLO  
FB  
69.8k  
34.8k  
BUCK–BOOST  
LT3942  
ISP  
ISN  
INTV  
CC  
1µF  
100k  
PWMTG  
ISMON  
1A  
FAULT  
V
REF  
V
V
LED  
= 12V  
LED  
LED  
0.22µF  
I
= 1A  
V
C
0
5
10 15 20 25 30 35 40  
INPUT VOLTAGE (V)  
1k  
12V  
CTRL  
PWM  
RP  
SS  
RT  
ANALOG DIM  
PWM DIM  
1A  
3942 TA01b  
22nF  
LED  
14.3k  
2MHz  
2.2nF  
GND  
SYNC/SPRD  
3942 TA01a  
Rev. B  
1
Document Feedback  
For more information www.analog.com  
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