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| 型号： | MIC3263YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 18/32页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER 6CH BKLT 24-MLF |
| 特色产品： | MIC3263 Boost Switching Regulator |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 400kHz ~ 1.8MHz |
| 电源电压： | 6 V ~ 40 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘，24-MLF? |
| 供应商设备封装： | 24-MLF?（4x4） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 576-3663-6 MIC3263YML TRDKR MIC3263YML TRDKR-ND |
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Micrel, Inc.
Figure 9 shows the waveforms during PW M dimming
pulses. The DRC duty cycle is 75% and th erefore the
dimming ratio (DR) is 37%. Ch1 is the switch n ode. Ch2 is
the su m of all six ILED channels. Figure 9 shows the boost
converter is OFF (not switching) between PWM dimming
pulses.
Figure 9. PWM Dimming Pulses
(Ch1 Switch Node; Ch2 is the I LED Tota l )
Direct Dimming
For direct dimming control connect DFS to V D D and use
the MODE pin for the dimming pulse. This m ethod will
bypass the internal dimming control and allows fo r
dimming control by the external PWM Dimming p ulse (see
Figure 9).
MIC3263
Figure 10. Direct Dimm ing Control
Boost Stage
A current-mode control is easi er to compensate than
voltage mode control, thus allow ing for a less complex
control loop stability design. An error amplifier amplifies
the difference between the feedback voltage and the
voltage on the CRV capacitor. This amplified error signal is
called the V CONTROL . A PWM comparator compares the
output of the error amp (V CONTROL ) to the sum of inductor
current and slope compensation currents. When the
current sums reach V CONTROL , the PWM pulse is terminated
and the boost power switch is turned off. A portion of the
energy stored in the inductor flows into the output
capacitor.
January 2010
18
M9999-012110
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC3287 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1.2MHz PWM White LED Driver with OVP in Thin SOT-23 and 2mm x 2mm MFL |
| MIC3287_10 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1.2MHz PWM White LED Driver with OVP in Thin SOT-23 and 2mm x 2mm MFL |
| MIC3287-24YD6 | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC3287-24YD6 TR | 功能描述:LED照明驱动器 2x2mm White LED Driver w/ 24V OVP (Lead Free) RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MIC3287-24YD6TR | 制造商:RF Micro Devices Inc 功能描述: |
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