- 您现在的位置：买卖IC网 > Datasheet目录343 > MIC2299-15YML TR (Micrel Inc)IC LED DRIVR WHITE BCKLGT 12-MLF Datasheet资料下载
参数资料
| 型号： | MIC2299-15YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 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： | 背光，闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1.75MHz ~ 2.3MHz |
| 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： | 576-3052-6 |
Micrel, Inc.
Application Information
Grounding
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 MIC2299 is shown
in the typical characteristics section. This graph
represents the maximum continuous output power
capability of the part when used on a minimal evaluation
board layout. This is a 2 layer board of 1 ounce copper,
utilizing the bottom layer as a ground plane heat sink.
The total area of the GND copper is approximately 1.3
square inches. This approaches a thermal resistance of
45 o C/W. 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 seconds.
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 MIC2299. Figure 8 shows the
theoretical output current limit of the MIC2299 using the
Evaluation Board inductor value of 2.2μH with a DCR
50m ? .
MIC2299
This simplifies to I RMS = I PK ? DC when there is no DC
level.
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.
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.
?
?
?
?
Looking at the SOA curves, this cannot be
driven continuously.
The time constant of the driver is <3 seconds, so
we can look at the peak current capability of the
driver in Figure 8.
Looking at Figure 8, the MIC2299 can achieve
more than the required 800mA peak current at
8.4V
Reading from the SOA curve in the typical
characteristics section, the MIC2299 at 3V, 50 o C
and 8.4V output voltage, can provide 580mA
RMS.
(
)
Figure 8. Peak Output Current vs. V OUT
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 .
October 2007
12
?
Now looking at the curve in Figure 9, using the
next lower value of 500mA RMS current, we 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.
M9999-101907-B
相关PDF资料 |
PDF描述 |
|---|---|
| MIC26603YJL EV | BOARD EVAL FOR MIC26603YJL |
| MIC26901YJL EV | BOARD EVAL FOR MIC26901YJL |
| MIC2841AYMT TR | IC LED DRIVR WHITE BCKLGT 10TMLF |
| MIC2842AYMT TR | IC LED DRIVR WHITE BCKLGT 10TMLF |
| MIC2843YMT TR | IC LED DRIVER PWM CONTROL 10TMLF |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC23030-4YMT TR | 功能描述:直流/直流开关调节器 8MHz 400mA Hyper Light Load Buck Regulator 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 |
| MIC23030-4YMT-TR | 功能描述:Buck Switching Regulator IC Positive Fixed 1.2V 1 Output 400mA 6-UFDFN Exposed Pad, 6-TMLF? 制造商:microchip technology 系列:HyperLight Load? 包装:剪切带（CT） 零件状态:停产 功能:降压 输出配置:正 拓扑:降压 输出类型:固定 输出数:1 电压 - 输入（最小值）:2.7V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:1.2V 电压 - 输出（最大值）:- 电流 - 输出:400mA 频率 - 开关:8MHz 同步整流器:是 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:6-UFDFN 裸露焊盘，6-TMLF? 供应商器件封装:6-TMLF?（1.6x1.6） 标准包装:1 |
| MIC23030-AYMT TR | 功能描述:直流/直流开关调节器 8MHz 400mA Hyper Light Load Buck Regulator 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 |
| MIC23030-AYMT-TR | 功能描述:Buck Switching Regulator IC Positive Adjustable 0.7V 1 Output 400mA 6-UFDFN Exposed Pad, 6-TMLF? 制造商:microchip technology 系列:HyperLight Load? 包装:剪切带（CT） 零件状态:停产 功能:降压 输出配置:正 拓扑:降压 输出类型:可调式 输出数:1 电压 - 输入（最小值）:2.7V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:0.7V 电压 - 输出（最大值）:3.6V 电流 - 输出:400mA 频率 - 开关:8MHz 同步整流器:是 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:6-UFDFN 裸露焊盘，6-TMLF? 供应商器件封装:6-TMLF?（1.6x1.6） 标准包装:1 |
| MIC23030-CYMT TR | 功能描述:直流/直流开关调节器 8MHz 400mA Hyper Light Load Buck Regulator 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 |
发布紧急采购，3分钟左右您将得到回复。