參數(shù)資料
型號(hào)： 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(dòng)器
文件頁(yè)數(shù)： 18/25頁(yè)
文件大?。?/td> 479K
代理商： MLX10803KDC
IC specification
MLX10803
High power LED driver
3901010803 Page 18/25
Data Sheet
Rev 025 2/OCT/07
Dimming is achieved by applying a PWM directly to the module supply or by changing the reference voltage on pin
VREF or the resistor’s value on IREF2 pin.
IC settling times must always be considered in PWM mode. Please refer also to chapter 1.1.4 for
additional PWM frequency considerations.
Limitation of the ON time prevents from exceeding the allowed average current when the power supply voltage is
not sufficient for the current to reach its peak value and restricts in this case duty cycle of switching to 68%.
I
t
Imax
Iavg
tmon_off
tmon_on
Imax/2
A pseudo random generator is applied to the monoflop time. The pseudo random generator runs with the clock
derived out of the monoflop time and adds a random distribution on these 3 LSBs. Therefore, the monoflop time
gets a
random
variation from its value. The EMI behaviour of the complete module is improved due to the variation
of the otherwise fixed switching frequency.
The inductance L of a coil describes the amount of magnetic energy that can be stored in it.
Consequently, high inductive coils will be discharged less than low inductive coils in a given time.
Generally the coil can be driven in two different ways:
1)
The coil is discharged partially only. That means the coil still carries a significant amount of energy
when going from discharging to charging. In that moment the charging current rises immediately to
the coil current that was flowing just before switching. This is connected with large dI/dt transients on the
RSENSE pin that have a negative impact on EMI. This is mostly preferred way of regulation because of low
influence of supply voltage and coil value on output current. Fast flyback diode is recommended and extra
important in this case.
2)
The coil discharged completely. Thus, at the end of a discharging cycle, the coil doesn’t carry energy
anymore. With the next charging cycle, current increases steadily from around zero. This way, large dI/dt
transients are completely avoided.
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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(lèi)別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)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(dòng)器:是 類(lèi)型 - 主要:背光 類(lèi)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(lèi)型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤(pán) 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(yè)面:1371 (CN2011-ZH PDF) 其它名稱(chēng):BD1603NUV-E2CT
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