- 您现在的位置：买卖IC网 > Sheet目录343 > MIC3203YM (Micrel Inc)IC LED DRIVER CTLR HB 8SOIC
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
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
MIC3231YTSE
IC LED DRVR HP CONS CURR 16TSSOP
MIC3263YML TR
IC LED DRIVER 6CH BKLT 24-MLF
MIC3287-24YD6 TR
IC LED DRIVR WHITE BCKLGT TSOT-6
MIC3289-16YD6 TR
IC LED DRIVR WHITE BCKLGT TSOT-6
MIC3291-18YML TR
IC PWM WLED DVR 1.8V 1.2MHZ 8MLF
MIC4100YM
IC DRIVER MOSFET 100V CMOS 8SOIC
MIC4102YM
IC DRIVER MOSFET 100V TTL 8SOIC
MIC4103YM
IC MOSFET DRIVER 100V CMOS 8SOIC
相关代理商/技术参数
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
MIC3205
制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High-Brightness LED Driver Controller with Fixed-Frequency Hysteretic Control
MIC3205YML
制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High-Brightness LED Driver Controller with Fixed-Frequency Hysteretic Control
MIC3205YML EV
制造商:Micrel Inc 功能描述:MIC3205 LED DRIVER EVAL BOARD 制造商:Micrel Inc 功能描述:MIC3205, LED DRIVER, EVAL BOARD 制造商:Micrel Inc 功能描述:MIC3205, LED DRIVER, EVAL BOARD, Core Chip:MIC3205, Topology:Step Down, No. of O 制造商:Micrel Inc 功能描述:MIC3205, LED DRIVER, EVAL BOARD, Core Chip:MIC3205, Topology:Step Down, No. of Outputs:1, Input Voltage Min:4.5V, Input Voltage Max:40V, Dimming Control Type:Analogue, PWM, Kit Contents:Evaluation Board MIC3205, SVHC:No SVHC
MIC3205YML T5
功能描述:LED照明驱动器 High-Brightness LED Driver Controller
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
MIC3205YML TR
功能描述:LED照明驱动器 High-Brightness LED Driver Controller
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
MIC3205YMLT5
制造商:Micrel Inc 功能描述:LED Driver Controller,4.5-40V,MLF10