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參數(shù)資料
| 型號： | LT1932 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | Constant-Current DC/DC LED Driver in ThinSOT |
| 中文描述： | 恒定電流DC / DC的LED驅(qū)動器采用ThinSOT |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 235K |
| 代理商： | LT1932 |
1
LT1932
Constant-Current DC/DC
LED Driver in ThinSOT
July 2001
The LT
1932 is a fixed frequency step-up DC/DC converter
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.
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 1
μ
A for the entire
circuit. The device’s 1.2MHz switching frequency permits
the use of tiny, low profile chip inductors and capacitors to
minimize footprint and cost in space-conscious portable
applications.
I
Up to 80% Efficiency
I
Inherently Matched LED Current
I
Drives Five White LEDs from 2V
I
Drives Six White LEDs from 2.7V
I
Drives Eight White LEDs from 3V
I
Precise, Adjustable Control of LED Current
I
Disconnects LEDs In Shutdown
I
1.2MHz Fixed Frequency Switching
I
Uses Tiny Ceramic Capacitors
I
Uses Tiny 1mm-Tall Inductors
I
Regulates Current Even When V
IN
> V
OUT
I
Operates with V
IN
as Low as 1V
I
Low Profile (1mm) ThinSOT
TM
Package
APPLICATIU
I
Cellular Telephones
I
Handheld Computers
I
Digital Cameras
I
Portable MP3 Players
I
Pagers
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 of its circuits as described herein will not infringe on existing patent rights.
FEATURES
DESCRIPTIOU
TYPICAL APPLICATIO
U
Li-Ion Driver for Four White LEDs
Efficiency
Final Electrical Specifications
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
V
IN
SW
D1
15mA
1932 TA01
L1
6.8
μ
H
V
IN
2.7V TO 4.2V
LT1932
SHDN
R
SET
C1: TAIYO YUDEN JMK212BJ475
C2: TAIYO YUDEN EMK212BJ105
D1:ZETEX ZHCS400
L1: SUMIDA CLQ4D106R8 OR PANASONIC ELJEA6R8
6
1
4
R
1.50k
PWM
DIMMING
CONTROL
C1
4.7
μ
F
C2
1
μ
F
2
3
5
LED
GND
LED CURRENT (mA)
0
55
E
60
65
70
75
80
85
5
10
15
20
1932 TA02
V
IN
= 4.2V
V
IN
= 2.7V
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| LT1932ES6 | 制造商:Linear Technology 功能描述:LED DRVR 8Segment 1.8V/2.5V/3.3V/5V/9V 6-Pin TSOT-23 |
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| LT1932ES6#PBF | 制造商:Linear Technology 功能描述:DC/DC Converter IC |
| LT1932ES6#TR | 功能描述:IC LED DRIVR WHITE BCKLGT TSOT-6 RoHS:否 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?開路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LT1932ES6#TRM | 功能描述:IC LED DRIVR WHITE BCKLGT TSOT-6 RoHS:否 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?開路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
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