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| 型号： | MIC3203YM |
| 厂商： | Micrel Inc |
| 文件页数： | 11/21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.
Application Information
The internal block diagram of the MIC3203 is shown in
Figure 1. The MIC3203 is composed of a current-sense
MIC3203
Frequency of Operation
To calculate the frequency spread across input supply:
comparator, voltage and current reference, 5V regulator
and MOSFET driver. Hysteretic mode control – also
called bang-bang control – is a topology that does not
employ an error amplifier, using an error comparator
V L = L
Δ I L
Δ t
instead.
The inductor current is controlled within a hysteretic
L is the inductance, ? I L is fixed (the value of the hysteresis):
window. If the inductor current is too small, the power
MOSFET is turned on; if the inductor current is large
enough, the power MOSFET is turned off. It is a simple
control scheme with no oscillator and no loop
compensation. Since the control scheme does not need
Δ I L =
V CS ( MAX ) - V CS( MIN )
R CS
loop compensation, it makes a design easy, and avoids
problems of instability.
Transient response to load and line variation is very fast
V L is the voltage across inductor L which varies by supply.
For current rising (MOSFET is ON):
and only depends on propagation delay. This makes the
control scheme very popular for certain applications.
LED Current and R CS
t r = L
Δ I L
V L _ RISE
The main feature in MIC3203 is to control the LED
current accurately within ± 5% of set current. Choosing a
high-side R CS resistor helps for setting constant LED
current irrespective of wide input voltage range. The
following equation gives the R CS value:
where:
V L_RISE = V IN ? I LED × R CS ? V LED
For current falling (MOSFET is OFF):
R CS =
1
2
x (
V CS ( MAX ) + V CS( MIN )
I LED
)
t f = L
Δ I L
V L _ FALL
R CS ( ? )
Table 1. R CS for LED Current
I LED (A) I 2 R (W)
Size (SMD)
where:
V L_FALL = V D + I LED × R CS + V LED
1.33
0.56
0.15
0.35
0.03
0.07
0603
0805
T = t r + t f , F SW =
1
T
0.4
0.28
0.2
0.13
0.5
0.7
1.0
1.5
0.1
0.137
0.2
0.3
0805
0805
1206
1206
where :
F SW =
(V D + I LED × R CS + V LED ) × (V IN - I LED × R CS - V LED )
L × Δ I L × ( V D + V IN )
0.1
0.08
0.068
2.0
2.5
3.0
0.4
0.5
0.6
2010
2010
2010
?
?
?
V D is Schottky diode forward drop
V LED is total LEDs voltage drop
V IN is input voltage
For V CS(MAX) and V CS(MIN), refer to the Electrical
Characteristic table.
?
I LED is average LED current
March 2010
11
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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