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| 型号： | MIC3231YTSE |
| 厂商： | Micrel Inc |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR HP CONS CURR 16TSSOP |
| 标准包装： | 94 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 通用 |
| 频率： | 100kHz ~ 1MHz |
| 电源电压： | 6 V ~ 45 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-EPAD TSSOP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1082 (CN2011-ZH PDF) |
| 其它名称： | 576-3404-5 |
Micrel, Inc.
VIN
L
47μH
D1
MIC3230/1/2
VOUT
CIN
4.7μF/50v
ENABLE
R2
100k
VIN
EN
OVP
R8
100k
COUT
4.7μF
100V
LED 1
PWMD
PWMD
Synch to other MIC3230
SYNC
DRV
Q1
LED X
FS
COMP
MIC3230/31
IS
RSLC
51
R9
4.33k
ILED Return
RFS
16.5k
CCOMP
10nF
C3
10μF
10V
VDD
AGND
EPAD
IADJ
PGND
V FB = 0.25V
RADJ
1/4W
RCS
1/2W
Analog ground
Power ground
Figure 7. Design Example Schematic
( Vout nom ? eff × Vin nom + V schottky )
Vout nom + V schottky
Design Example
In this example, we will be designing a boost LED driver
operating off a 12V input. This design has been created
to drive six LEDs at 350mA with a ripple of about 12%.
We are designing for 80% efficiency at a switching
These can be calculated for the nominal (typical) operating
conditions, but should also be understood for the minimum
and maximum system conditions as listed below.
D nom =
frequency of 500kHz.
Select R FS
D max =
( Vout max ? eff × Vin min + V schottky )
Vout max + V schottky
( 7526 )
R FS ( k Ω ) =
D min =
To operate at a switching frequency of 500kHz, the R FS
resistor must be chosen using Equation 3.
1 . 035
= 16 . 6 k Ω
500
Use the closest standard value resistor of 16.5k ? .
Select R ADJ
Having chosen the LED drive current to be 350mA in this
example, the current can be set by choosing the RADJ
resistor from Equation 1:
( Vout min ? eff × Vin max + V schottky )
Vout min + V schottky
Therefore D NOM =56% D MAX = 78% and D MIN = 33%
Inductor Selection
First, it is necessary to calculate the RMS input current
(nominal, min and max) for the system given the operating
conditions listed in the design example table. This minimum
value of the RMS input current is necessary to ensure proper
operation. Using Equation 9, the following values have been
R ADJ =
= 0 . 71 Ω
0. 25 V
0 . 35 A
The power dissipation in this resistor is:
P ( R ADJ ) = I 2 * R ADJ = 87 mW
Use a resistor rated at ? watt or higher. Choose the
closest value from a resistor manufacture.
calculated:
I IN _ RMS _ max =
I IN _ RMS _ nom =
I IN _ RMS _ min =
V OUT _ max × I OUT _ max
eff × V IN _ min
V OUT _ nom × I OUT _ nom
eff × V IN _ nom
V OUT _ min × I OUT _ min
eff × V IN _ max
= 1 . 64 A _ rms
= 0 . 78 A _ rms
= 0 . 48 A _ rms
( Vout ? eff × Vin + V diode )
Operating Duty Cycle
The operating duty cycle can be calculated using
Equation 12 provided below:
Eq. (12) D =
Vout + V diode
Iout is the same as ILED
Selecting the inductor current (peak-to-peak), I L_PP , to be
between 20% to 50% of I IN_RMS_nom , in this case 40%, we
obtain:
I in _ PP _ nom = 0 . 4 I in _ rms _ nom = 0 . 4 * 0 . 78 = 0 . 31 A P ? P
March 2011
13
M9999-030311-D
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相关代理商/技术参数 |
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| MIC3231YTSE TR | 功能描述:LED照明驱动器 Boost Driver Controller with Dither for High Power LEDs 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 |
| MIC3232YMM | 功能描述:LED照明驱动器 400kHz Fixed Frequency Boost Driver Controller for High Power LEDs 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 |
| MIC3232YMM EV | 功能描述:LED 照明开发工具 400kHz Fixed Frequency Boost Driver Controller for High Power LEDs - 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: |
| MIC3232YMM TR | 功能描述:LED照明驱动器 400kHz Fixed Frequency Boost Driver Controller for High Power LEDs 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 |
| MIC3263 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Six-Channel WLED Driver for Backlighting Applications with Flicker-Free Dimming |
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