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参数资料
| 型号： | MIC2298-15YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER HIGH BRIGHT 12-MLF |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 闪灯/白光 |
| 类型 - 次要： | 高亮度 LED（HBLED），白色 LED |
| 频率： | 800kHz ~ 1.2MHz |
| 电源电压： | 2.5 V ~ 10 V |
| 输出电压： | 30V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-VFDFN 裸露焊盘，12-MLF? |
| 供应商设备封装： | 12-MLF?（4x4） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1082 (CN2011-ZH PDF) |
| 其它名称： | 576-1657-6 |
Micrel, Inc.
Application Information
Grounding
MIC2298
The graph in Figure 9 shows the peak LED current
which can be pulsed at a given duty cycle (DC) to stay
within SOA limits of 400mA to 700mA.
Both the AGND and PGND must be connected to the
exposed backside pad. The exposed backside pad also
improves thermal performance. A large ground plane
decreases thermal resistance to ambient air.
Thermal Considerations and the SOA
The SOA (safe operating area) of the MIC2298 is shown
in the typical characteristics sub-section. This graph
represents the maximum continuous output power
capability of the part when used in the evaluation board
layout. An alternative layout with more copper area for
heat sinking will increase the area under the SOA curve.
Note that the SOA is for continuous power and not peak
power and is effectively a thermal limitation. The SOA is
true for a time constant of approximately >1 second.
Therefore, any load transient with a period of < 3s can
exceed the SOA curve power up to a maximum limited
by the current limit of the MIC2298. Figure 8 shows the
theoretical output current limit of the MIC2298 using the
Evaluation Board inductor value of 4.7μH.
Figure 9. Duty Cycle vs. Peak Current
for Fixed RMS Current
Example
Two series connected high brightness white LEDs with a
Vf max of 4.2V and peak current of 800mA require
pulses of 300ms at 3 second intervals. Power source is
a Li-ion cell of 3v min.
Figure 8. Peak Output Current vs. V OUT
?
?
?
?
Looking at the SOA curves (Page 4, Max DC
LED Current), these cannot be driven
continuously.
The time constant of the driver is < 3 seconds,
so one can look at the peak current capability of
the driver in Figure 8.
Looking at Figure 8, the MIC2298 can achieve
more than the required 800mA peak current at
8.4V.
Reading from the SOA curve in the typical
characteristics sub-section (Page 4, Max DC
LED Current), the MIC2298 at 3V, 50 o C and
(
)
If our load is within these limits, it is possible to drive the
load at some repetition rate or duty cycle (DC). This is
allowed as long as we limit the RMS current to below the
SOA limit.
The RMS current for a pulsed current is known to be
I RMS = I PK ? PK ? DC + I DC where the current pulse I PK-PK
sits on a DC level of I DC .
This simplifies to I RMS = I PK ? DC when there is no DC
level.
October 2007
11
?
8.4V output voltage, can provide 580mA RMS.
Now looking at the curve in Figure 9, using the
next lower value of 500mA RMS current, one
can see that the 850mA peak can be driven at a
duty cycle of ~33% (or 1 second out of every 3
seconds). That is well within our target of
300ms.
M9999-101707-B
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2299 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:3.5A Minimum, 2MHz High Brightness LED Driver |
| MIC2299_11 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:3.5A Minimum, 2MHz High Brightness LED Driver |
| MIC2299-15YML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:3.5A Minimum, 2MHz High Brightness LED Driver |
| MIC2299-15YML TR | 功能描述:直流/直流开关调节器 2.5V 2MHz Boost LED Driver with 3.5A Switch RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC2299-15YMLTR | 制造商:Micrel 功能描述:7W 2MHz White LED Driver, MIC2299-15YML |
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