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參數(shù)資料
| 型號： | MLX10803KDC |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | High power LED driver |
| 中文描述： | 高功率LED驅(qū)動器 |
| 文件頁數(shù)： | 17/25頁 |
| 文件大?。?/td> | 479K |
| 代理商： | MLX10803KDC |
IC specification
MLX10803
High power LED driver
3901010803 Page 17/25
Data Sheet
Rev 025 2/OCT/07
7.2.
The principle in detail
After powering on the MLX10803 the switch becomes open and the current through the LED starts to rise. The rate
of current raise is limited by the value of the coil. When the current through the LED reaches half of a maximum
value, the ON timer is started, and if during 58.5 clocks of the internal oscillator the maximum current value through
the LED is not reached, the driver switches off. This maximum current is adjusted by the resistors on the IREF2,
IREF1 or voltage applied to VREF pins (voltage on these pins is divided by 5). The minimum of these voltages is
taken as a reference. The driver is switched off for a monoflop time, which is equal to 9…16 pulses of oscillator.
The frequency of the oscillator can be set by the customer using the Rosc value using such formula:
)
44
.
]
[
/(
2
222
]
[
+
=
k
Rosc
MHz
Fosc
.
Both parameters, the peak current threshold voltage and the monoflop time, create an ON/OFF period to form an
average current through the LED. By adjusting these parameters, an adjustment of the average load current is
possible in a wide range.
I
Imax2
t
Iavg2
Iavg1
Imax1
I
t
Iavg1
Iavg2
Imax
T1
T2
Note: The current sense comparator has a typical debouncing time of 300ns as shown in the block
diagram. This
delay time prevents the driver from being switched off due to short term switching oscillations. When working with
very short monoflop times, this time has to be taken into account for calculations.
I
t
Imax
Iavg
tmon_off
By applying a PWM signal on VS/PWM, the LED can be dimmed from 0% to 100%.
VS/PWM = L
LED permanent OFF
VS/PWM = PWM
LED dimmed with PWM between 0% to 100%
VS/PWM = H
LED permanent ON
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MLX10803KDC-AAA-000-RE | 功能描述:IC LED DRVR HP CONST CURR 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:642kHz 電源電壓:2.7 V ~ 5.5 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產(chǎn)品目錄頁面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT |
| MLX10803KDC-AAA-000-TU | 制造商:Melexis Semiconductors 功能描述:IC LED DRIVER HP 8SOIC |
| MLX10803KDC-TR-7 | 制造商:Melexis Semiconductors 功能描述: |
| MLX12101 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Sensor Protection IC |
| MLX12101E | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Sensor Protection IC |
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