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| 型号： | MIC3263YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 11/32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.
Functional Description
The MIC3263 is a six-channel LED driver. A constant
output current converter is the preferred metho d for driving
LEDs. The MIC3263 is specifically designed to operate as
a constant-current LED driver to keep the curre nt in all six
channels constant. PWM dimming is employ ed in each
channel. Each channel of LED current is indi vidually and
tightly regulated during each Duty Ratios (D R) on-time.
During the DR off-time the LED current is turn ed off. The
duty cycle of the DR pulse determines the br ightness of
the LEDs. The MIC3263 is designed to operate as a boost
controller in which the output voltage is high er than the
input voltage. This configuration allows for th e design of
multiple LEDs in series to help maintain col or a nd
brightness. During each DR pulse off-time th e boost
converter is turned off (not switching). The boo st converter
is on (switching) during each DR pulse on-time.
The MIC3263 has a very-wide input voltage range of 6V
and 40V to help accommodate for a diverse ra nge of input
voltage applications. In addition, the LED cur rent can be
programmed through the use of an exter nal resistor
(R ISET ). This provides design flexibility in a djusting the
current for a particular application. The M IC3263 can
control the brightness of the LEDs via its PW M dimming
capability. Applying a PWM dimming signal (up to 40kHz)
to the DRC pin allows for control of the bright ness of the
LED. It ha s a boost stage that boosts the V IN to a high
enough voltage to forwa rd bias the LED channels. The
MIC3263 is a c onstan t current controller. The controller
keeps the current in each of the six cha nnels at a constant
value. Each channel has an independent curren t regulator
in series with each LED channel. The curr en t in each
channel is within 3% of the others.
The MIC3263 uses three main control loops (Figure 1
control loops):
1) Current Amp loop (Fastest)
2) Booster loop (Fast)
3) Capacitor Reference Voltage (CRV) loop (Slo w)
The current Amplifier Loop is faster than the Boost Loop
and CRV Loop. CRV is the reference voltage for the boost
error amp.
MIC3263
Figure 1. Constant-Current Control Loops
Figure 2. Simplified C ontrol Loop
The objective of these loops is t o keep the LED current
constant. The boost output voltage V OUT will vary when
CRV changes. V OUT will be what it needs to be to keep
ILEDs constant. The current amp loop is so fast the other
loops can be viewed as static DC values. On a pulse to
pulse basis the boost loop is fast enough that CRV is a
constant value.
The goal of the CRV loop is to keep the collector’s voltage
V(IO1–IO6) at or about 1.2V, thereby keeping the bipolar
transistor in the linear region and also keep the power loss
across the bipolar as low as possible. Keeping the bipolar
in the linear region allows the current amp loop to be able
to regulate the LED current.
January 2010
11
M9999-012110
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MIC3287_10 | 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 |
| 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 |
| MIC3287-24YD6TR | 制造商:RF Micro Devices Inc 功能描述: |
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