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| 型号： | AD8240YRMZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER PWM CONTROL 8-MSOP |
| 标准包装： | 50 |
| 恒定电流： | 是 |
| 拓扑： | 线性，PWM |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 车载 |
| 频率： | 500Hz |
| 电源电压： | 9 V ~ 27 V |
| 输出电压： | 12V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 791 (CN2011-ZH PDF) |
AD8240
CONTROLLING THE LED LAMP
The LEDs are turned on and off depending on the CMOS
compatible digital voltage level present at the PWM pin (Pin 3).
This voltage can be continuous for a simple on/off function, or
PWM for dimming control. The PWM frequency should be less
than 500 Hz with a range from 5% to 100%. Typical values are
5% for running and 95% for braking.
USING/EVALUATING THE V SENSE OUTPUT
Important: The output impedance of V SENSE is approximately
10 k?. Because of this, it may be necessary to buffer the output
in order to drive a load of less than 100 k?. An oscilloscope,
micro-controller A/D converter, or DVM may be used to
accurately measure the voltage at the V SENSE pin.
The V SENSE output is used to detect a partial LED failure, or an
overcurrent condition. The voltage present at V SENSE is propor-
tional to the current through the load with the equation
I LOAD = ( V SENSE /24)/ R SHUNT
To determine if the load is correct, the voltage at V SENSE should
be as follows during full power operation:
500 mA × 0.4 ? × 24 V/V = 4.8 V
If there is a partial LED failure, V SENSE drops in proportion to the
quantity of the failure. For example, if 25% of the LEDs fail, the
voltage drops by 25%.
If there is a short to ground, V SENSE is near 0 V because the
output is latched off and no current is flowing.
Using/Evaluating the Short-Circuit Protection Feature
If there is a short or an overload condition, the voltage at
V SENSE falls close to zero, and the output shuts down
(the transistor driver shuts off). This resets when the PWM
voltage is brought low and then high again. If the condition
persists, the AD8240 attempts to drive the output to 12 V and
then immediately shuts down. If a PWM voltage is used, the
AD8240 attempts to start after each PWM cycle.
Selection of the shunt resistor can be found by manipulating this
equation. For example
V SENSE = I LOAD × R SHUNT
This can be simulated by increasing the load so the voltage at
V SENSE slightly exceeds 5 V. When this happens, the output shuts
down, and the V SENSE voltage is close to 0 V .
Expected Load = 500 mA
R SHUNT = 0.4 ?
Rev. 0 | Page 7 of 12
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| AD8240YRMZ-R7 | 功能描述:IC LED DRIVER PWM CONTROL 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| AD8240YRMZ-RL | 功能描述:IC LED DRIVER PWM CONTROL 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| AD8244 | 制造商:AD 制造商全称:Analog Devices 功能描述:Single-Supply, Low Power, Precision FET Input Quad Buffer |
| AD8244ARMZ | 制造商:Analog Devices 功能描述:JFET QUAD BUFFER AFE - Rail/Tube 制造商:Analog Devices 功能描述:IC BUFFER QUAD FET-INPUT 10MSOP 制造商:Analog Devices 功能描述:Operational Amplifiers - Op Amps JFET Quad Buffer AFE Sigma Delta ADC |
| AD8244ARMZ-R7 | 制造商:Analog Devices 功能描述:JFET QUAD BUFFER AFE - Tape and Reel |
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