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参数资料
| 型号： | MIC2293-15BML 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： | 5,000 |
| 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： | 1.75MHz ~ 2.25MHz |
| 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： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | MIC2293-15BMLTR |
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 |
|---|---|
| MIC2293-15YML | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC2293-15YML TR | 功能描述:LED照明驱动器 2MHz White LED Driver w/15V 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 |
| MIC2293-15YMLTR | 制造商:RF Micro Devices Inc 功能描述: |
| MIC2293-15YML-TR | 功能描述:LED 驱动器 IC 1 输出 DC DC 稳压器 升压（升压） 模拟，PWM 调光 750mA（开关） 8-MLF?（2x2） 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 类型:DC DC 稳压器 拓扑:升压（升压） 内部开关:是 输出数:1 电压 - 供电（最低）:2.5V 电压 -?供电（最高）:10V 电压 - 输出:- 电流 - 输出/通道:750mA（开关） 频率:2MHz 调光:模拟，PWM 应用:背光 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 供应商器件封装:8-MLF?（2x2） 标准包装:1 |
| MIC2293-24YML TR | 功能描述:LED照明驱动器 2MHz White LED Driver w/15V 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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