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| 型号： | MIC3203-1YM |
| 厂商： | Micrel Inc |
| 文件页数： | 12/21页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER CTLR HB 8SOIC |
| 特色产品： | MIC3203 LED Driver Controllers |
| 标准包装： | 95 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 通用 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 频率： | 1.5MHz |
| 电源电压： | 4.5 V ~ 42 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 576-3660-5 MIC3203-1YM-ND |
Micrel, Inc.
Inductor
According to the above equation, choose the inductor to
MIC3203
Given an inductor value, the size of the inductor can be
determined by its RMS and peak current rating.
make the operating frequency no higher than 1.5MHz.
The following Tables give a reference inductor value and
corresponding frequency for a given LED current. For
space-sensitive applications, smaller inductor with higher
Δ I L
I L
= 2 ×
V CS( MAX ) - V CS( MIN )
V CS ( MAX ) + V CS ( MIN )
= 0 . 18
switching frequency could be used but efficiency of the
I L ( RMS ) L I +
=
regular will be reduced.
2
1
12
Δ I L 2 ≈ I L
Table 2. Inductor for VIN = 12V, 1 LED
RCS ( ? ) I LED (A) L (μH) F SW (kHz)
1.33 0.15 220 474
I L ( PK ) = I L +
1
2
Δ I L = 1 . 09 I L
0.56
0.4
0.28
0.2
0.13
0.1
0.08
0.068
0.35
0.5
0.7
1.0
1.5
2.0
2.5
3.0
100
68
47
33
22
15
12
10
439
461
467
475
463
522
522
533
where:
I L is inductor average current.
Select an inductor with saturation current rating at least 30%
higher than the peak current.
MOSFET
MOSFET selection depends upon the maximum input
voltage, output LED current and switching frequency.
The selected MOSFET should have 30% margin on
Table 3. Inductor for VIN = 24V, 4 LEDs
RCS ( ? ) I LED (A) L (μH) F SW (kHz)
1.33 0.15 470 474
0.56 0.35 220 426
0.4 0.5 150 447
maximum voltage rating for high reliability requirements.
The MOSFET channel resistance R DSON is selected such
that it helps to get the required efficiency at the required LED
currents as well as meets the cost requirement.
Logic level MOSFETs are preferred as the drive voltage is
limited to 5V.
0.28
0.2
0.13
0.1
0.08
0.068
0.7
1.0
1.5
2.0
2.5
3.0
100
68
47
33
27
22
470
493
463
507
496
517
The MOSFET power loss has to be calculated for proper
operation. The power loss consists of conduction loss and
switching loss. The conduction loss can be found by:
2
P LOSS ( CON ) = I RMS ( FET ) × R DSON
I RMS ( FET ) = I LED × D
Table 4. Inductor for VIN = 36V, 8 LEDs
RCS ( ? ) I LED (A) L (μH) F SW (kHz)
D =
V TOTAL _ LED
V IN
1.33
0.56
0.4
0.28
0.2
0.13
0.1
0.08
0.068
March 2010
0.15
0.35
0.5
0.7
1.0
1.5
2.0
2.5
3.0
470
220
150
100
68
47
33
27
22
495
446
467
490
515
485
530
519
541
12
M9999-032910-A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC3203-1YM EV | 功能描述:LED 照明开发工具 HBLED Driver Controller with High-Side Current Sense - Evaluation Board RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MIC3203-1YM TR | 功能描述:LED照明驱动器 HBLED Driver Controller with High-Side Current Sense 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 |
| MIC3203YM | 功能描述:LED照明驱动器 HBLED Driver Controller with High-Side Current Sense 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 |
| MIC3203YM EV | 功能描述:LED 照明开发工具 HBLED Driver Controller with High-Side Current Sense - Evaluation Board RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MIC3203YM TR | 功能描述:LED照明驱动器 HBLED Driver Controller with High-Side Current Sense 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 |
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