Datasheet > AD8240YRMZ-R7

AD8240YRMZ-R7

更新时间： 2024-11-18 20:36:07

品牌	Logo	应用领域
亚德诺 - ADI		驱动光电二极管接口集成电路
页数	文件大小	规格书
13页	205K
描述
LED Driver/Monitor

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中文翻译

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数据手册
替代型号

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AD8240YRMZ-R7 数据手册

LED Driver/Monitor

AD8240

FEATURES

FUNCTIONAL BLOCK DIAGRAM

PWM input for LED brightness control

Open LED detection

V_O

SHUNT BASE

Latch-off overcurrent protection

Constant voltage regulated output

Supply range: 9 V to 27 V

R_SENSE

10k

V_SENSE

Ω

Regulated voltage range: 12.5 V to 27 V

Operating current: 300 µA

Shutdown current: 10 µA

Temperature range −40°C to +125°C

8-lead MSOP package

350k

REFERENCE

Ω

LATCH-OFF

DRIVER

PWM

250kΩ

AD8240

GENERAL DESCRIPTION

GND

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.

Figure 1.

PRODUCT HIGHLIGHTS

1. Partial LED lamp failure detection.

Allows for compliance with automotive regulations

for turn signal functionality detection and minimum

brightness, as well as running/brake light minimum

brightness compliance.

A CMOS compatible, level-dependent, digital input can be used

for PWM control of the LED brightness. V_Ois 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%.

2. Current limiting/latch-off protection.

Limiting and latching off the LED current protects vehicle

wiring and prevents lamp damage

Open LED detection is accomplished by measuring the change

in LED lamp current caused by an open LED(s) 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.

3. PWM input.

Provides brightness control.

4. Constant voltage output.

Saves cost by minimizing wiring and system design

complexity.

5. Drives an external transistor for low power operation.

Providing for an external power transistor allows the

AD8240 to be a low cost solution in a small package. A

more efficient design is made possible when the system

designer can select a power device with specifications

that match the application requirements.

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.

6. Linear regulation.

Minimizes EMI, which allows faster system integration,

qualification, and time to market. Additionally, costs are

reduced by eliminating the inductor required for a

switching design. Because of the power-saving nature of

LED lamps as compared to incandescent lamps, a

switching driver is typically not required.

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable.

However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.326.8703

www.analog.com

12 3 4 5 6 7...13

中文翻译

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AD8240YRMZ-R7 替代型号

型号	品牌	替代类型	描述	数据表
AD8240YRM	ADI	完全替代	LED Driver/Monitor
AD8240YRMZ	ADI	类似代替	LED Driver/Monitor

与AD8240YRMZ-R7相关器件

型号	品牌	获取价格	描述	数据表
AD8240YRMZ-REEL	ADI	获取价格	LED DISPLAY DRIVER, PDSO8, MO-187AA, MSOP-8
AD8240YRMZ-REEL7	ADI	获取价格	LED DISPLAY DRIVER, PDSO8, MO-187AA, MSOP-8
AD8244	ADI	获取价格	Single-Supply, Low Power, Precision FET Input Quad Buffer
AD8244ARMZ	ADI	获取价格	Single-Supply, Low Power, Precision FET Input Quad Buffer
AD8244ARMZ-R7	ADI	获取价格	Single-Supply, Low Power, Precision FET Input Quad Buffer
AD8244BRMZ	ADI	获取价格	Single-Supply, Low Power, Precision FET Input Quad Buffer
AD8244BRMZ-R7	ADI	获取价格	Single-Supply, Low Power, Precision FET Input Quad Buffer
AD824A	ADI	获取价格	Operational Amplifiers Selection Guide
AD824ACHIPS	ADI	获取价格	Single Supply, Rail-to-Rail Low Power, FET-Input Op Amp
AD824AN	ADI	获取价格	Single Supply, Rail-to-Rail Low Power, FET-Input Op Amp

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