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参数资料
| 型号： | LT3474EFE-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR HP CONS CURR 16TSSOP |
| 标准包装： | 95 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 颜色，白色 LED |
| 频率： | 200kHz ~ 2MHz |
| 电源电压： | 3.5 V ~ 36 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
LT3474/LT3474-1
Step-Down
1A LED Driver
FEATURES
DESCRIPTION
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True Color PWM? Delivers Constant Color with
400:1 Dimming Range
Wide Input Range: 4V to 36V
Up to 1A LED Current
Adjustable 200kHz–2MHz Switching Frequency
Adjustable Control of LED Current
Integrated Boost Diode
High Output Current Accuracy is Maintained
Over a Wide Range from 35mA to 1A
Open LED (LT3474) and Short-Circuit Protection
High Side Sense Allows Grounded
Cathode Connection
Uses Small Inductors and Ceramic Capacitors
LT3474-1 Drives LED Strings Up to 26V
Compact 16-Lead TSSOP Thermally Enhanced
Surface Mount Package
The LT ? 3474/LT3474-1 are ?xed frequency step-down
DC/DC converters designed to operate as constant-current
sources. An internal sense resistor monitors the output
current allowing accurate current regulation, ideal for
driving high current LEDs. High output current accuracy
is maintained over a wide current range, from 35mA to
1A, allowing a wide dimming range.
Unique PWM circuitry allows a dimming range of 400:1,
avoiding the color shift normally associated with LED
current dimming.
The high switching frequency offers several advantages,
permitting the use of small inductors and ceramic capaci-
tors. Small inductors combined with the 16-lead TSSOP
surface mount package save space and cost versus
alternative solutions. The constant switching frequency
combined with low-impedance ceramic capacitors result
APPLICATIONS
in low, predictable output ripple.
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Automotive and Avionic Lighting
Architectural Detail Lighting
Display Backlighting
Constant Current Sources
With their wide input range of 4V to 36V, the LT3474/
LT3474-1 regulate a broad array of power sources, from
5V logic rails to unregulated wall transformers, lead acid
batteries and distributed power supplies. A current mode
PWM architecture provides fast transient response and
L , LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are
the property of their respective owners. Patent Pending
TYPICAL APPLICATION
Step-Down 1A LED Driver
cycle-by-cycle current limiting. Frequency foldback and
thermal shutdown provide additional protection.
Ef ?ciency
V IN
5V TO 36V
95
V IN = 12V
TWO SERIES CONNECTED
2.2μF
V IN
SHDN
R T
BOOST
SW
LT3474
BIAS
0.22μF
10μH
90
85
80
75
WHITE 1A LEDS
ONE WHITE 1A LED
REF
OUT
80.6k
V ADJ
V C
PWM
LED
DIMMING*
CONTROL
2.2μF
70
65
0.1μF
GND
LED1
60
*SEE APPLICATIONS SECTION FOR DETAILS
3474 TA01a
55
0
200
400 600 800
LED CURRENT (mA)
1000
3474 G02
3474fd
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3474EFE-1-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Step-Down 1A LED Driver |
| LT3474EFEPBF | 制造商:Linear Technology 功能描述:Step-Down 1A LED Driver,LT3474 |
| LT3474EFE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Step-Down 1A LED Driver |
| LT3474EFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Step-Down 1A LED Driver |
| LT3474IFE | 制造商:Linear Technology 功能描述:LED DRVR 1Segment 5V/9V/12V/15V/18V/24V 16-Pin TSSOP EP |
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