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参数资料
| 型号： | MIC2292-15YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/11页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER WHITE BCKLGT 8-MLF |
| 标准包装： | 1 |
| 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： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1.4MHz ~ 1.8MHz |
| 电源电压： | 2.5 V ~ 10 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFDFN 裸露焊盘，8-MLF? |
| 供应商设备封装： | 8-MLF?（2x2） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1082 (CN2011-ZH PDF) |
| 其它名称： | 576-1078-6 |
Micrel, Inc.
Dimming Control
There are two techniques for dimming control:
1. PWM Dimming Control
PWM dimming control is implemented by applying a
PWM signal on EN pin as shown in Figure 1. The
MIC2292/93 is turned on and off by the PWM signal.
With this method, the LEDs operate with either zero or
full current. The average LED current is increased
proportionally to the duty-cycle of the PWM signal.
This technique has high-efficiency because the IC and
the LEDs consume no current during the off cycle of
the PWM signal. Typical frequency should be between
100Hz and 10kHz.
2. Continuous Dimming Control
Continuous dimming control is implemented by
applying a DC control voltage to the FB pin of the
MIC2292/93 through a series resistor as shown in
Figure 2. The LED current is decreased proportionally
with the amplitude of the control voltage. The LED
intensity (current) can be dynamically varied applying
a DC voltage to the FB pin. The DC voltage can come
MIC2292/93
Open-Circuit Protection
If the LEDs are disconnected from the circuit, or in case an
LED fails open, the sense resistor will pull the FB pin to
ground. This will cause the MIC2292/93 to switch with a
high duty-cycle resulting in output overvoltage. This may
cause the SW pin voltage to exceed its maximum voltage
rating, possibly damaging the IC and the external
components. To ensure the highest level of protection, the
MIC2292/93 has two product options in the 8-pin MLF ?
package with overvoltage protection, OVP. The extra pins
of the 8-pin MLF ? package allow the use of a dedicated
OVP monitor with options for 15V or 34V (see Figure 3).
The reason for the two OVP levels is to let users choose
the suitable level of OVP for their application. For example,
a 4-LED application would typically see an output voltage
of no more than 12V, so a 15V OVP option would offer a
suitable level of protection. This allows the user to select
the output diode and capacitor with the lowest voltage
ratings, and accordingly, smallest size and lowest cost.
The OVP will clamp the output voltage to within the
specified limits.
from a DAC signal or a filtered PWM signal. The
advantage of this approach is that a high frequency
PWM signal (>10kHz) can be used to control LED
intensity.
Figure 3. MLF ? Package OVP Circuit
Start-Up and Inrush Current
During start-up, inrush current of approximately double the
Figure 1. PWM Dimming Method
nominal current flows to set up the inductor current and the
voltage on the output capacitor. If the inrush current needs
to be limited, a soft-start circuit similar to Figure 4 could be
implemented. The soft-start capacitor, C SS , provides
over-drive to the FB pin at start-up, resulting in gradual
increase of switch duty cycle and limited inrush current.
Figure 2. Continuous Dimming
Figure 4. Soft-Start Circuit
April 2012
10
M9999-040212-B
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2292-34BML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP |
| MIC2292-34BML TR | 功能描述:IC LED DRIVER WHITE BCKLGT 8-MLF RoHS:否 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:1 系列:- 恒定电流:- 恒定电压:- 拓扑:PWM，切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:642kHz 电源电压:2.7 V ~ 5.5 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商设备封装:10-VSON 包装:剪切带 (CT) 工作温度:-30°C ~ 85°C 产品目录页面:1371 (CN2011-ZH PDF) 其它名称:BD1603NUV-E2CT |
| MIC2292-34YML | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC2292-34YML TR | 功能描述:LED照明驱动器 1.6MHz White LED Driver w/34V 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 |
| MIC2292-34YMLH10 TR | 制造商:Micrel 功能描述:Micrel MIC2292-34YMLH10 TR |
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