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参数资料
| 型号： | MX841BE |
| 厂商： | IXYS |
| 文件页数： | 4/6页 |
| 文件大小： | 0K |
| 描述： | IC CONVERTER WHITE LED 8-SOIC |
| 标准包装： | 100 |
| 拓扑： | 升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 600kHz ~ 1.3MHz |
| 电源电压： | 1.1 V ~ 5.5 V |
| 输出电压： | 20V |
| 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 ~ 85°C |
MX841
Functional Description
The MX841 is specifically designed to be
operated from a single cell battery source. The
step-up voltage necessary for the constant
current source to drive up to 5 white LED’s in
IXYS
Light intensity is controlled by reducing the
voltage at the CTRL input. As the CTRL input
voltage is reduced below the user defined
maximum value, the oscillator signal driving the
series, or multiple strings of white LED’s, is
N-Channel
MOSFET is interrupted
by the
achieved with minimal external components. (See
Application Schematics on pages 1&4).
Setting the LED Current
The regulated output current is determined by the
selection of the sense Resistor connected from
the I SENSE input to ground, and the maximum user
defined voltage of the CTRL input. The desired
output current, (typically 15mA to 20mA for white
LEDs), is derived using the following formula for
the R SENSE value: R SENSE ? = (V CTRL X 1/13) / I LED .
Current Regulation / Light Intensity Control
The I SENSE voltage is fed into an
ErrorAmp/Comparator. The user defined Control
Voltage applied at the CTRL input is scaled by a
gain factor of 1/13 and compared to the I SENSE
voltage. If the scaled control voltage is greater
than the I SENSE voltage, the 1.0MHz oscillator
signal driving the N-Channel MOSFET will be
enabled. Once the I SENSE voltage reaches the
scaled CTRL voltage the oscillator signal is
ErrorAmp/Comparator. The pulse skip modulating
of the N-Channel MOSFET causes a reduction in
the regulated current equal to the ratio of the
reduced CTRL voltage to the maximum CTRL
voltage.
Sleep Mode
The MX841 goes into sleep mode when the V CTRL
input is less than 100mV. All circuits except V CTRL
detection are shutdown and the supply current
falls to 6uA. Once the V CTRL input rises above
260mV the MX841 resumes normal operation.
Over Voltage Detection
The MX841 will go into a shutdown state to avoid
an over voltage condition if the current path
between the SW output and the R SENSE input is
interrupted. A voltage reference and comparator
circuit evaluates the voltage potential at the OVD
input and shuts down the oscillator and N-
Channel MOSFET if an over voltage condition is
detected. Normal operation is resumed once the
modulated
on and
off by the
OVD input voltage falls below the reference
ErrorAmp/Comparator to maintain the desired
regulated output current.
voltage, (20V typical).
MX841
Drawing No. 17023
4
Preliminary
03/10/05
www.ixys.net
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| MX844RTR | 功能描述:板上安装温度传感器 12-Bit Power & Temp Sensor QFN-28 on T&R RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
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