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参数资料
| 型号： | MIC2298-15YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/13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.
Over-Voltage Protection
The MIC2298 offers over-voltage protection functionality.
If an LED is disconnected from the circuit or the
feedback pin is shorted to ground, the feedback pin will
fall to ground potential. This will cause the MIC2298 to
switch at full duty cycle in an attempt to maintain the
feedback voltage. As a result, the output voltage will
climb out of control. This may cause the switch node
voltage to exceed its maximum voltage rating, possibly
damaging the IC and the external components. To
ensure the highest level of protection, the MIC2298 OVP
pin will shut the switch off when an over-voltage
condition is detected, saving itself and the output
capacitor from damage. The OVP threshold can be
increased by adding a resistor divider between the
output and ground. Be careful not to exceed the 30V
rating of the switch.
Figure 4. Adjustable OVP Circuit
Brightness Control
Pin Brightness Functionality
BRT Pin V FB (V)
OPEN 200mV or V SS/DIM
MIC2298
Hence, a 200m ? sense resistor will achieve nominally
1A when both DIM and BRT pins are left open.
PWM control of brightness
A control signal can be driven into the enable pin to vary
average current through the LED for applications not
sensitive to low frequency (~100Hz) light modulation.
For such applications, the SS/DIM pin capacitance
should be minimized to achieve a fast turn on time. 0nF
will achieve approximately 1.5ms with a C COMP value of
33nF.
For other applications, where no analog control voltage
is available, the BRT pin can be driven through a low
pass filter (18k ? and 470nF) at a PWM frequency of
>5kHz to set the FB voltage, and therefore, the LED
current from 20% to 100% of Nominal LED current
(Figure 5).
Figure 5. High Frequency PWM Programming
Via BRT Pin
Since the DIM pin is typically utilized for soft start, it is
recommended to use the enable and BRT pins for the
PWM method of adjusting the average LED current.
Figures 6 and 7 below show typical results for this
GND
≥ 20k ? to 100k ?
[R BRT ] to GND
SS/DIM Pin
OPEN
Voltage v
40mV
(10μA × R BRT )/5
V FB (V)
200mV
V FB = v
method.
Table 1. BRT and SS/DIM Brightness Control Functionality
The MIC2298 has built in brightness/dimming
functionally for white LED applications. The BRT and
SS/DIM pins are available for brightness/dimming control
functionality. Table 1 illustrates the different modes of
dimming functionality afforded by the BRT and SS/DIM
pins. The resulting LED current is then calculated as:
I LED = V FB /R SENSE
Figure 6. LED Current vs. DC (on enable pin)
October 2007
8
M9999-101707-B
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| MIC26901YJL EV | BOARD EVAL FOR MIC26901YJL |
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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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