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| 型号： | AD8240YRMZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/12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
USING/EVALUATING THE AD8240 LED DRIVER MONITOR
Figure 3 shows a connection diagram for a typical application.
SETUP
In order to set up and evaluate the AD8240, the following
components and equipment are needed:
Shunt Resistor Selection
The shunt resistor is chosen by the equation
R SHUNT ≤ 0 . 2 V I LOAD
For example if the load is expected to be 500 mA, the shunt
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A shunt resistor (typically 0.1 ? to 0.5 ? depending on the
load). See the Shunt Resistor Selection section.
A transistor (the type depends on the load)
Two capacitors
LED load
5 V reference voltage
9 V to 27 V supply
Oscilloscope
Digital voltmeter (DVM)
value should be equal to or less than 0.4 ?. This keeps the
output of the current sense amplifier from being greater than
4.8 V in normal operation to prevent noise from causing the
output to latch off.
Circuit Configuration
Connect the pass transistor, capacitors, and LED load(s) as
shown in Figure 3. It is important to note that the value of C M
should be at least 22 nF to ensure circuit stability.
The LED lamp should be configured to expect 12 V. This is
the result of selecting the series/parallel combinations of LEDs
and series resistors. The series resistors can be used to adjust
for LED supplier brightness variations from lot to lot.
Connect 5 V to Pin 2 (5 V reference) and at least 9 V to Pin 5
(V PLUS ). It may be necessary to raise the V PLUS voltage to more
than 13 V, depending on the drop across the pass transistor, for
the output to be regulated at 12 V. This varies according to the
application and the pass transistor type.
.
R SHUNT
V BATT
C M
CL
47nF
V PLUS
5
SHUNT
6
7
BASE 22nF
8
V O
R SENSE
V SENSE 1
10k ?
5V
REFERENCE
2
LATCH-OFF
R1
350k ?
PWM 3
DRIVER
R2
250k ?
4
GND
Figure 3. Connections for Typical Applications
Rev. 0 | Page 6 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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