ANALOG DEVICES AD8240YRMZ 芯片, 发光二极管驱动器, 线性, MSOP-8
Product Details
The AD8240 LED driver/monitor, in combination with an external transistor, supplies a constant 12 V to drive LED lamps. This allows cost-effective LED lamp monitoring and short-circuit protection. The output is regulated at 12 V when the supply voltage is between 12.5 V and 27 V.
A CMOS compatible, level-dependent, digital input can be used for PWM control of the LED brightness. VO is turned on when the PWM input is high and turned off when the input is low. The AD8240 is designed to work with a PWM frequency up to 500 Hz, and a typical PWM range from 5% to 95%.
Open LED detection is accomplished by measuring the change in LED lamp current caused by an open LEDs through the use of an internal high-side current-sense amplifier that amplifies the voltage across an external current shunt. The voltage across the shunt resistor is amplified to a level that can be measured by a microcontroller A/D converter or a comparator. The ability to measure the change in LED lamp current is the key benefit of constant-voltage LED lamp driving.
The output is current-limited by latching off the output voltage when the current reaches a preset level. The current limit is set by selecting the value of the external current shunt that causes the output of the sense amplifier to slightly exceed the 5 V reference level when the current exceeds a maximum level. When the sense amplifier output exceeds 5 V, it trips an internal comparator that causes the driver to latch off the output voltage. The latch is reset during the next PWM cycle. The overcurrent condition can also be detected by a microcontroller or external comparator by measuring the sense amplifier output.
### Features and Benefits
频率 500 Hz
电源电压DC 2.60 V, 5.50 V max
输出接口数 1
输入电压DC 9.00V ~ 27.0V
输出电压 12 V
输出电流 500 mA
供电电流 360 mA
针脚数 8
工作温度Max 125 ℃
工作温度Min -40 ℃
电源电压 9V ~ 27V
输入电压 9V ~ 27V
安装方式 Surface Mount
引脚数 8
封装 MSOP-8
宽度 3 mm
封装 MSOP-8
工作温度 -40℃ ~ 125℃
产品生命周期 Active
包装方式 Tube
制造应用 汽车级
RoHS标准 RoHS Compliant
含铅标准 Lead Free
REACH SVHC标准 No SVHC
REACH SVHC版本 2016/06/20
型号/品牌 | 代替类型 | 替代型号对比 |
---|---|---|
AD8240YRMZ ADI 亚德诺 | 当前型号 | 当前型号 |
AD8240YRMZ-R7 亚德诺 | 类似代替 | AD8240YRMZ和AD8240YRMZ-R7的区别 |
AD8240YRMZ-RL 亚德诺 | 类似代替 | AD8240YRMZ和AD8240YRMZ-RL的区别 |
AD8240YRM 亚德诺 | 类似代替 | AD8240YRMZ和AD8240YRM的区别 |