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| 型号： | MIC3203YM |
| 厂商： | Micrel Inc |
| 文件页数： | 13/21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： | 576-3661-5 MIC3203YM-ND |
Micrel, Inc.
The switching loss occurs during the MOSFET turn-on
and turn-off transition and can be found by:
MIC3203
The input capacitor current rating can be considered as
I LED /2 under the worst condition D = 50%.
P LOSS ( TRAN ) = IN LED
V × I × F SW
I DRV
× ( Q gs 2 + Q gd )
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
I DRV =
V DRV
R GATE
capacitor across LED.
Frequency Dithering
The MIC3203 is designed to reduce EMI by dithering the
where:
R GATE is total MOSFET resistance, Q gs2 and Q gd can be
found in a MOSFET manufacturer datasheet.
The total power loss is:
P LOSS ( TOT ) = P LOSS ( CON ) + P LOSS ( TRAN )
The MOSFET junction temperature is given by:
switching frequency ± 12% in order to spread the frequency
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
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
switching frequency and its harmonics. The MIC3203
modulates the V CS(MAX) with amplitude ± 6mV by a pseudo
random generator to generate the ± 12% of the switching
frequency dithering to reduce the EMI noise peaks.
T J = P LOSS ( TOT ) × R θ JA + T A
The T J must not exceed maximum junction temperature
under any conditions.
Freewheeling Diode
The free wheeling diode should have the reverse voltage
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 ripple current rating. To determine the input current
ripple rating, the RMS value of the input capacitor can be
found by:
I CIN(RMS) = I LED × D × (1 - D)
The power loss in the input capacitor is:
P LOSS(CIN) = I
× C IN
2
CIN(RMS)
ESR
March 2010
13
M9999-032910-A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
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