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LT1932

更新时间： 2024-11-28 22:51:47
品牌 Logo 应用领域
凌特 - Linear 驱动器
页数 文件大小 规格书
16页 237K
描述
Constant-Current DC/DC LED Driver in ThinSOT

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中文翻译

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LT1932 数据手册

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Final Electrical Specifications  
LT1932  
Constant-Current DC/DC  
LED Driver in ThinSOT  
July 2001  
U
FEATURES  
DESCRIPTIO  
Up to 80% Efficiency  
TheLT®1932isafixedfrequencystep-upDC/DCconverter  
designed to operate as a constant-current source. Be-  
cause it directly regulates output current, the LT1932 is  
ideal for driving light emitting diodes (LEDs) whose light  
intensity is proportional to the current passing through  
them, not the voltage across their terminals.  
■
■
Inherently Matched LED Current  
■
Drives Five White LEDs from 2V  
■
Drives Six White LEDs from 2.7V  
■
Drives Eight White LEDs from 3V  
■
Precise, Adjustable Control of LED Current  
■
Disconnects LEDs In Shutdown  
1.2MHz Fixed Frequency Switching  
With an input voltage range of 1V to 10V, the device works  
from a variety of input sources. The LT1932 accurately  
regulates LED current even when the input voltage is  
higher than the LED voltage, greatly simplifying battery-  
powered designs. A single external resistor sets LED  
current between 5mA and 40mA, which can then be easily  
adjusted using either a DC voltage or a pulse width  
modulated (PWM) signal. When the LT1932 is placed in  
shutdown, the LEDs are disconnected from the output,  
ensuring a quiescent current of under 1µA for the entire  
circuit. The device’s 1.2MHz switching frequency permits  
theuseoftiny, lowprofilechipinductorsandcapacitorsto  
minimize footprint and cost in space-conscious portable  
applications.  
■
■
Uses Tiny Ceramic Capacitors  
Uses Tiny 1mm-Tall Inductors  
■
■
Regulates Current Even When VIN > VOUT  
■
Operates with VIN as Low as 1V  
Low Profile (1mm) ThinSOTTM Package  
■
U
APPLICATIO S  
■
Cellular Telephones  
■
Handheld Computers  
■
Digital Cameras  
■
Portable MP3 Players  
■
Pagers  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
ThinSOT is a trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
Li-Ion Driver for Four White LEDs  
Efficiency  
85  
L1  
6.8µH  
D1  
V
IN  
V
V
= 4.2V  
= 2.7V  
IN  
80  
2.7V TO 4.2V  
IN  
75  
70  
C1  
4.7µF  
6
1
V
SW  
IN  
LT1932  
SHDN  
PWM  
DIMMING  
CONTROL  
5
3
C2  
1µF  
65  
60  
55  
LED  
GND  
R
SET  
15mA  
4
2
R
SET  
1.50k  
0
5
10  
LED CURRENT (mA)  
15  
20  
C1: TAIYO YUDEN JMK212BJ475  
C2: TAIYO YUDEN EMK212BJ105  
D1:ZETEX ZHCS400  
1932 TA01  
1932 TA02  
L1: SUMIDA CLQ4D106R8 OR PANASONIC ELJEA6R8  
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tation that the interconnection ofits circuits as described herein willnotinfringe on existing patentrights.  
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