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参数资料
| 型号： | MIC3263YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 15/32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.
Pin Descriptions
FSW
Sets the boost switching frequency. Connec t a resi stor
from FSW to GND to set the switching frequency between
400kHz and 1.8MHz. Use the fo llowing equation s to sele ct
R FSW :
R FSW (k ? ) ≈ 500 ? 0.3 × f SW (kHz)
RSL P
The boost section is a peak current mode ty p o logy and
needs slope compensation to eliminate s ub -harmonic
oscillation (see “Slope Compensation”).
OVPS
Thi s is a virtual ground of the resistor divider feedback
network in the boost stage. At turn on, a swit ch connects
this node-to-ground. When the part is disabled the switch
will open and disconnects the feedback resistor network
MIC3263
Use the following equations to determine the value for
R DFS :
R DFS (k ? ) = ? 20 × f DIM (kHz) + 432 (HF Mode)
R DFS (k ? ) = ? 335 × f DIM (kHz) + 433 (LF Mode)
Example:
For a dimming frequency of 10kHz, use the HF Mode:
R DFS (k ? ) = ? 20 × 10 + 432 = 232k ? in HF Mode
For 1kHz, u se LF Mode:
R DFS (k ? ) = ? 335 × 1 + 433 = 98k ? in LF Mode
Use the closest standard value.
from ground. This eliminates current draw from V IN by the
boost resistor divider network.
OVP
This is the over-voltage protection monitor. Also t his is the
feedback signal t hat connects to the error amp input.
MODE
450
400
350
300
250
200
150
RDFS(in k ? ) = -20*Dimming Frequency (in kHz) + 432
This selects the internal PWM dimming frequ ency range.
When mode is low the PWM dimming frequen cy range is
100Hz to 2kHz. When mode is high the PWM D frequency
range is 1.5kHz to 20kHz. Mode is high s elects High
Frequency (HF) mode; Mode is low s elects Low
100
50
0
0
2.5
5
7.5 10 12.5 15
Dimming Frequency (kHz)
17.5
20
22.5
Frequency (LF) mode.
DFS
DFS stands for Dimming Frequency Select. T he dimming
frequenc y of the LEDs is different than the input dimmin g
frequency at the DRC input. The MIC3263 uses a n in ternal
dimming frequency. This internal dimming frequency is
programmable by an external resistor to ground R DFS .
For direct dimming control, connect DFS to V DD and use
the MODE pin for the input dimming pulse. This method by
passes the internal dimming control and allows for
dimming control by the external PWM pulse.
Figure 5. R DFS vs. Dimming Frequency in HF Mode
RDFS(k ? ) = -335*Dim m ing Frequency (in kHz) + 433
500
400
300
200
100
0
When using internal dimming the range is determined by
0
0.2
0.4
0.6
0.8
1
1.2
1.4
the MODE pin and the actual frequency is determined by
R DFS . Connect a resistor to ground to select a dimming
frequency.
Dim m ing Frequency (kHz)
Figure 6. R DFS vs. Dimming Frequency in LF Mode
January 2010
15
M9999-012110
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相关代理商/技术参数 |
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|---|---|
| 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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