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LT3932IUFD-1#PBF PDF预览

LT3932IUFD-1#PBF

更新时间： 2024-11-23 19:18:03
品牌 Logo 应用领域
凌特 - Linear 驱动接口集成电路
页数 文件大小 规格书
30页 1164K
描述
LT3932/LT3932-1- 36V, 2A Synchronous Step-Down LED Driver; Package: QFN; Pins: 28; Temperature Range: -40°C to 85°C

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LT3932IUFD-1#PBF 技术参数

是否Rohs认证： 符合生命周期：Transferred
零件包装代码：QFN针数：28
Reach Compliance Code：compliant风险等级：5.58
接口集成电路类型：LED DISPLAY DRIVERBase Number Matches：1

LT3932IUFD-1#PBF 数据手册

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LT3932/LT3932-1  
36V, 2A Synchronous  
Step-Down LED Driver  
FEATURES  
DESCRIPTION  
The LT®3932 is a monolithic, synchronous, step-down  
DC/DCconverterthatutilizesfixed-frequency,peakcurrent  
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 volt-  
age limit can be set with a resistor divider to the FB pin.  
n
±±1.5 LED ꢀCrrent ꢁegClatiꢂn  
n
±±125 ꢃCtꢄCt ꢅꢂltage ꢁegClatiꢂn  
n
.000:±/±0000+:± PWM Dimming at ±00Hz  
(LT3932/LT3932-±)  
±28:± Internal PWM Dimming  
n
n
Sꢄread-SꢄectrCm FreqCency MꢂdClatiꢂn  
Silent Switcher® ArchitectCre fꢂr Lꢂw EMI  
n
Theswitchingfrequencyisprogrammablefrom200kHzto  
2MHzbyanexternalresistorattheRTpinorbyanexternal  
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 LT3932  
also includes a driver for an external, high side PMOS for  
PWM dimming and an internal PWM signal generator for  
analogcontrolofPWMdimmingwhenanexternalsignalis  
notavailable.TheLT3932-1permitshigherdimmingratios.  
n
3.6V to 36V Input Voltage Range  
n
0V to 36V LED String Voltage  
n
200kHz to 2MHz with SYNC Function  
n
99.9% Maximum Duty Cycle  
n
Analog or Duty Cycle LED Current Control  
n
Open/Short LED Protection and Fault Indication  
n
Accurate LED Current Sense with Monitor Output  
n
Programmable UVLO  
n
Thermally Enhanced 28-Pin (4mm ꢀ 5mm) QFN  
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.  
APPLICATIONS  
n
Automotive Lighting  
All registered trademarks and trademarks are the property of their respective owners. Protected  
by U.S. Patents including 7199560, 7321203, 9596728, 9642200 and other patents pending.  
n
Industrial and General Purpose Lighting  
n
Machine Vision Systems  
TYPICAL APPLICATION  
2A LED Driver with Internal PWM Dimming  
INTV  
CC  
Internal PWM Dimming  
V
12V  
IN  
V
BST  
IN  
8.2µH  
22nF  
274k  
SW  
OUT  
2x1µF  
EN/UVLO  
10µF  
SW  
V
V
OUT 9V 1A  
30.1k  
20V/DIV  
110k  
C
OUT  
FB  
LT3932  
PWMTG  
10V/DIV  
100µF  
V
10k  
REF  
IL  
GND  
ISP  
100k  
CTRL  
PWM  
1A/DIV  
2.2µF  
2.2µF  
100k  
100k  
ILED  
1A/DIV  
50mΩ  
3932 TA01b  
INTV  
CC  
ISN  
PWM = 1.078V  
(8% PWM DUTY RATIO)  
2µs/DIV  
PWMTG  
ISMON  
FAULT  
FAULT  
SYNC/SPRD  
SS  
ISMON  
RT RP  
V
C
45.3k  
2MHz  
28.7k  
7.8kHz  
162k  
10nF  
100nF  
3932 TA01a  
3932fa  
1
For more information www.linear.com/LT3932  
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