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参数资料
| 型号： | MIC3263YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 25/32页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER 6CH BKLT 24-MLF |
| 特色产品： | MIC3263 Boost Switching Regulator |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 400kHz ~ 1.8MHz |
| 电源电压： | 6 V ~ 40 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘，24-MLF? |
| 供应商设备封装： | 24-MLF?（4x4） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 576-3663-6 MIC3263YML TRDKR MIC3263YML TRDKR-ND |
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Micrel, Inc.
Using the nominal values, one gets:
MIC3263
A Coilcraf t # DO3316P-223ML is used in this example.
Its DCR is 85 m ? , I SAT =2.6A.
L=
12V × 0.66
0.36A × 1MHz
= 22 μ H
P INDUCTOR(MAX) = 0.9 2 × 8 5 m ? = 67mW
Output Capacitor
If no t a standard value, use the next higher st andard
value. Select the standard inductor value of 22μH .
Going back and calculating the actual ripple current
gives:
In this LED driver application, th e I LED ripple current is a
more impo rtant facto r compared to that of the output
ripple voltage (alt hough the two are directly related). To
find the C OUT for a required I LED ripple use the following
calculation:
I L_PP =
V IN(NOM) ×D NOM
L × F SW
=
12V × 0.66
22 μ H × 1MHz
= 0.3 6A PP
For an output ripple I LED(RIPPLE) = 20mA.
Equation 12:
The average input current is different than the RMS input
current b ecause of the ripple current. If the ripple current
is low, then the average input current nearly equals the
RMS input current. In the case wh e re the average input
C OUT =
I LED(total) × D
V Ripple × F sw
current is different than the RMS, Equation 9 shows the
following:
V RI PPLE can usually be kept below 50mV:
2 ( I IN_PP )
Equation 9 :
I I N_AVE(MAX) =
( I IN_RMS(MAX) )
-
12
2
I LED(total) = 6 × 30mA = 18 0mA
0.18A × 0.76
C OUT = = 2.7 μ F
50mV × 1Mhz
I IN_AVE(MAX) =
( 0.9 )
2
-
( 0.36 )
12
2
≈ 0.9A
Use 2.7μF or higher.
The amount that C OUT will disch arge depends upon the
time between PWM Dimming p luses and the size of the
The Maximum Peak input current I L_PK can found using
Equation 10:
Equation 10 :
I L_PK(MAX) = I IN_AVE(MAX) + 0.5 ×I L_PP(MAX) = 1.0A
The saturation current (I SAT ) at the highest operating
temperature the inductor must be rated higher than this.
The power dissipated in the inductor is:
Equation 11:
P INDUCTOR(max) = I IN_RMS(MAX)2 × DCR
output capacitor. At the next PWM Dimming pul se C OUT
has to be charged up to the full output voltage V OUT
before the desired LED current flows.
In put Capacitor
The input capacitor is shown in the Typical Application.
For superior performance, ceramic capacitors should be
used because of their low Equivalent Series Resistance
(ESR). The input capacitor C IN ripple current is equal to
the ripple in the inductor. The ripple voltage across the
input capacitor, is the ESR of C IN times the inductor
ripple. The input capacitor will also bypass the EMI
generated by the converter as well as any voltage spikes
generated by the inductance of the input line. For a
required V IN(RIPPLE) .
Equation 13:
C IN =
I IN_PP
8 × V IN(RIPPLE) × F SW
=
( 0.36A )
8 × 50mV × 1MHz
= 0.8 μ F
January 2010
25
M9999-012110
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| MIC3287 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1.2MHz PWM White LED Driver with OVP in Thin SOT-23 and 2mm x 2mm MFL |
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| MIC3287-24YD6 | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC3287-24YD6 TR | 功能描述:LED照明驱动器 2x2mm White LED Driver w/ 24V OVP (Lead Free) 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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