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參數(shù)資料
| 型號： | LTC3490ES8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | Single Cell 350mA LED Driver |
| 中文描述： | LED DISPLAY DRIVER, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-8 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 123K |
| 代理商： | LTC3490ES8 |
6
LTC3490
3490f
OPERATIOU
The LTC3490 is a high efficiency, constant current source
for 1W high intensity white LEDs. These high intensity
LEDs require a fixed current of 350mA with a voltage
compliance of 2.8V to 4V.
The LTC3490 operates with 1 or 2 NiMH or alkaline cells.
It functions as a boost converter with a current sense re-
sistor providing the control feedback. If the battery voltage
is greater than the required LED compliance, it will cycle
off periodically to maintain the correct average current. It
features a low voltage start-up circuit that will start with an
input voltage of only 1V. Once the drive voltage exceeds
2.3V, the circuit operates from the drive voltage.
All of the loop compensation is internal; only the main filter
capacitor is needed for stable operation.
Dimming Function
During normal operation with the CTRL/SHDN pin con-
nected to V
IN
, the LED drive current is controlled at
350mA. The drive current can be reduced by changing the
voltage on the CTRL/SHDN pin.
For V
IN
0.2 < V
CTRL
< V
IN
0.9, the LED current is
proportional to V
CTRL
/V
IN
. This allows a simple potenti-
ometer from V
IN
to control the current without sensitivity
to the battery voltage. The LED drive current is given by the
formula:
I
V
V
mA
LED
CTRL
IN
=
500
–0 2
When V
CTRL
> V
IN
0.9, the LED drive current is clamped
at 350mA.
Open-Circuit Protection
Since this is a boost converter attempting to drive a cur-
rent into the load, an open or high impedance load will cause
the regulator loop to increase the output voltage in an ef-
fort to achieve regulation. To protect the device, maximum
output voltage is limited to 4.7V under all conditions.
Undervoltage Sense and Protection
The undervoltage lockout prevents excessive inductor
peak current and protects the batteries from deep dis-
charging which can damage them. The low-battery indica-
tor allows the end user to be made aware that the batteries
are nearing the end of their useful life.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3490ES8#PBF | 功能描述:IC LED DRIVER PHOTO FLASH 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標準包裝:60 系列:- 恒定電流:- 恒定電壓:- 拓撲:線性（LDO），PWM，升壓（升壓） 輸出數(shù):8 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:RGB，白色 LED 頻率:500kHz ~ 1.5MHz 電源電壓:4.75 V ~ 26 V 輸出電壓:45V 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* 工作溫度:-40°C ~ 85°C |
| LTC3490ES8#TRPBF | 功能描述:IC LED DRIVER PHOTO FLASH 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標準包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓撲: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 |
| LTC3499 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:750mA Synchronous Step-Up DC/DC Converters with Reverse-Battery Protection |
| LTC3499B | 制造商:LINER 制造商全稱:Linear Technology 功能描述:750mA Synchronous Step-Up DC/DC Converters with Reverse-Battery Protection |
| LTC3499BEDD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:750mA Synchronous Step-Up DC/DC Converters with Reverse-Battery Protection |
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