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| 型号： | AD8240YRMZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/12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
PRODUCT DESCRIPTION
The AD8240 consists of four functional blocks labeled A
through D, as shown in Figure 2.
HIGH-SIDE CURRENT-SENSE AMPLIFIER WITH
OPEN LED DETECTION (BLOCK B)
V PLUS SHUNT BASE
V O
This amplifier is used to measure the LED current by ampli-
fying the voltage across a user-selected shunt resistor. It has a
V SENSE
B
gain of 24 and an overall accuracy of 5%. The output of the
amplifier is typically connected to a microcontroller A/D
5V
REFERENCE
C
A
converter input so that the condition of the LED lamp can be
determined. This output can also be tied to other devices such
as a latching comparator or output buffer. It is important to note
that the output of this amplifier has a relatively high impedance
of approximately 10 k?. As a result, a buffer amplifier should be
PWM
AD8240
D
used if the load is less than 100 k?.
COMPARATOR WITH LATCH-OFF OVERCURRENT
PROTECTION (BLOCK C)
GND
Figure 2. Simplified Functional Block Diagram
Table 3 briefly describes the blocks, while the sections that
follow provide more detailed information.
Table 3.
This block is used to shut down the output in the case of a
short circuit or an overcurrent condition. When the output
of the high-side current-sense amplifier approaches 5 V, the
comparator output switches, causing the driver to latch off the
output voltage.
Block
A
Description
Linear regulator
INTELLIGENT DRIVER (BLOCK D)
The intelligent driver provides multiple functions:
B
C
D
High-side current-sense amplifier
Comparator
Driver
?
Level shifts and conditions the output of the regulator
amplifier to drive an external user-selected power
transistor.
LINEAR REGULATOR (BLOCK A)
The simplified architecture of the linear regulator block is an
amplifier and resistor divider. One input to the amplifier is
tied to the 5 V reference. The other input is tied to a resistor
divider that sets the ratio of the 5 V reference to V O . As a
result, the accuracy of the voltage output is proportional to
the accuracy of the 5 V reference. For example, if the 5 V
reference is 5% high (5.25 V), the output is 5% high (12.6 V).
?
?
?
Accepts PWM input so that LED brightness can be
controlled by a user-supplied PWM signal.
The PWM input can also be used as a simple on/off
control for applications that do not require variable
brightness.
Latch-off input that latches the output off when the
comparator trips during an overcurrent event. The latch
is reset by cycling the PWM input.
Rev. 0 | Page 5 of 12
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相关代理商/技术参数 |
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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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