AD8240YRMZ

更新时间： 2024-01-17 14:01:50

品牌	Logo	应用领域
亚德诺 - ADI		驱动器监控
页数	文件大小	规格书
12页	258K
描述
LED Driver/Monitor

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技术参数
数据手册

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AD8240YRMZ 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Active	零件包装代码：	TSSOP
包装说明：	MO-187AA, MSOP-8	针数：	8
Reach Compliance Code：	not_compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.05
接口集成电路类型：	LED DISPLAY DRIVER	JESD-30 代码：	S-PDSO-G8
JESD-609代码：	e0	长度：	3 mm
湿度敏感等级：	1	复用显示功能：	NO
功能数量：	1	区段数：	1
端子数量：	8	最高工作温度：	125 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP	封装形状：	SQUARE
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	240
认证状态：	Not Qualified	座面最大高度：	1.1 mm
最大供电电压：	27 V	最小供电电压：	9 V
标称供电电压：	13.5 V	表面贴装：	YES
温度等级：	AUTOMOTIVE	端子面层：	Tin/Lead (Sn/Pb)
端子形式：	GULL WING	端子节距：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	3 mm	Base Number Matches：	1

AD8240YRMZ 数据手册

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

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

gain of 24 and an overall accuracy of 5%. The output of the

amplifier is typically connected to a microcontroller A/D

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 kΩ. As a result, a buffer amplifier should be

used if the load is less than 100 kΩ.

SHUNT BASE

V_SENSE

REFERENCE

PWM

COMPARATOR WITH LATCH-OFF OVERCURRENT

PROTECTION (BLOCK C)

AD8240

GND

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.

Figure 2. Simplified Functional Block Diagram

Table 3 briefly describes the blocks, while the sections that

follow provide more detailed information.

Table 3.

Block

Description

INTELLIGENT DRIVER (BLOCK D)

Linear regulator

High-side current-sense amplifier

Comparator

The intelligent driver provides multiple functions:

•

Level shifts and conditions the output of the regulator

amplifier to drive an external user-selected power

transistor.

Driver

LINEAR REGULATOR (BLOCK A)

•

Accepts PWM input so that LED brightness can be

controlled by a user-supplied PWM signal.

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).

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

1 2 3 456 7 8...12

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