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| 型号： | MIC3202YME |
| 厂商： | Micrel Inc |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR HB 37V 1A 8-SOIC |
| 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： | 是 |
| 类型 - 主要： | 通用 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 频率： | 1MHz |
| 电源电压： | 6 V ~ 37 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 供应商设备封装： | 8-SOIC-EP |
| 包装： | 管件 |
| 其它名称： | 576-3760-5 |
Micrel, Inc.
Inductor
According to the above equation, choose the inductor to
make the operating frequency no higher than 1.0MHz.
Tables 2, 3, and 4 give a reference inductor value and
corresponding frequency for a given LED current. For
space-sensitive applications, smaller inductor with higher
switching frequency could be used but the efficiency of
the regular will be reduced.
MIC3202
where:
I L is inductor average current.
Select an inductor with saturation current rating at least 30%
higher than the peak current.
Free-Wheeling Diode
The free-wheeling diode should have the reverse voltage
RCS ( ? )
1.33
0.56
0.4
0.28
0.2
I LED (A)
0.15
0.35
0.5
0.7
1.0
L (μH)
220
100
68
47
33
F SW (kHz)
474
439
461
467
475
rating to accommodate the maximum input voltage. The
forward voltage drop should be small to get the lowest
conduction dissipation for high efficiency. The forward current
rating has to be at least equal to LED current. A Schottky
diode is recommended for highest efficiency.
Input Capacitor
The ceramic input capacitor is selected by voltage rating and
Table 2. Inductor for V IN = 12V, 1 LED
ripple current rating. To determine the input current ripple
rating, the RMS value of the input capacitor can be found by:
RCS ( ? )
I LED (A)
L (μH)
F SW (kHz)
1.33
0.56
0.4
0.28
0.15
0.35
0.5
0.7
470
220
150
100
474
426
447
470
I CIN(RMS) = I LED × D × (1 - D)
The power loss in the input capacitor is:
P LOSS(CIN) = I
× C IN
0.2 1.0 68 493
Table 3. Inductor for V IN = 24V, 4 LEDs
2
CIN(RMS)
ESR
RCS ( ? )
1.33
0.56
0.4
0.28
0.2
I LED (A)
0.15
0.35
0.5
0.7
1.0
L (μH)
470
220
150
100
68
F SW (kHz)
495
446
467
490
515
The input capacitor current rating can be considered as
I LED /2 under the worst condition D = 50%.
LED Ripple Current
The LED current is the same as inductor current. If LED ripple
current needs to be reduced then place a 4.7μF/50V ceramic
capacitor across LED.
Table 4. Inductor for V IN = 36V, 8 LEDs
Given an inductor value, the size of the inductor can be
determined by its RMS and peak current rating.
Frequency Dithering
The MIC3202 is designed to reduce EMI by dithering the
switching frequency ± 12% in order to spread the noise
spectrum over a wider range. This lowers the EMI noise
peaks generated by the switching regulator.
Switching regulators generate noise by their nature and they
Δ I L
I L
= 2 ×
V CS( MAX ) - V CS( MIN )
V CS ( MAX ) + V CS ( MIN )
= 0 . 18
are the main EMI source to interference with nearby circuits. If
the switching frequency of a regulator is modulated via
frequency dithering, the energy of the EMI is spread among
many frequencies instead of concentrated at fundamental
I L ( RMS ) = I L 2 +
1
12
Δ I L 2 ≈ I L
switching frequency and its harmonics. The MIC3202
modulates the V CS(MAX) with amplitude ± 6mV by a pseudo
random generator to generate the ± 12% of the switching
I L ( PK ) = I L +
September 2010
1
2
Δ I L = 1 . 09 I L
frequency dithering to reduce the EMI noise peaks.
11
M9999-091710-A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC3202YME EV | 功能描述:LED 照明开发工具 37V/ 1A HBLED Driver 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: |
| MIC3202YME TR | 功能描述:LED照明驱动器 37V/ 1A HBLED Driver 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 |
| MIC3203 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High-Brightness LED Driver Controller with High-Side Current Sense |
| MIC3203-1YM | 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 |
| 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: |
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