MP4688DN-Z

更新时间： 2024-02-03 20:07:10

品牌	Logo	应用领域
芯源 - MPS		驱动器
页数	文件大小	规格书
11页	477K
描述
LED Driver, 1-Segment, PDSO8, MS-012BA, SOIC-8

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技术参数
数据手册

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MP4688DN-Z 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：	SOIC
包装说明：	SOIC-8	针数：	8
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.07
接口集成电路类型：	LED DISPLAY DRIVER	JESD-30 代码：	R-PDSO-G8
长度：	4.9 mm	功能数量：	1
区段数：	1	端子数量：	8
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	HLSOP
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, LOW PROFILE
峰值回流温度（摄氏度）：	NOT SPECIFIED	认证状态：	Not Qualified
座面最大高度：	1.7 mm	最大供电电压：	75 V
最小供电电压：	4.5 V	标称供电电压：	12 V
表面贴装：	YES	温度等级：	INDUSTRIAL
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	3.9 mm	Base Number Matches：	1

MP4688DN-Z 数据手册

MP4688 – 80V INPUT, 1A HIGH POWER LED DRIVER

OPERATION

Hysteresis Current Control with Adaptive

Threshold Adjustment

Thermal Shutdown

Thermal shutdown is implemented to prevent

the chip from operating at exceedingly high

temperatures. When the silicon die temperature

is higher than its upper threshold, it shuts down

the whole chip. When the temperature is lower

than its lower threshold, the chip is enabled

again.

MP4688 operates in a hysteresis current control

mode to regulate the LED current accurately.

FB pin is the sensed voltage of LED current

across the sensing resistor. The power

MOSFET is turned on and remains on until FB

pin rises to 215mV. The power MOSFET is

turned off and remains off until FB pin falls to

185mV. The two thresholds of 215mV and

185mV are adaptive adjusted to compensate all

the circuit delays so that the LED current is

regulated very accurately with 200mV average

value at FB pin.

LED Short Protection

The LED current is well regulated with FB pin

voltage at 200mV. As long as the LED sensing

resistor is not failed, the output current is within

limitation. If the LED sensing resistor is failed or

the output is shorted to GND directly, the FB pin

voltage is low even the power MOSFET is

turned on. The power MOSFET will be shut off

if such failure time is longer than 10us. MP4688

will retry the operation after about 300us delay.

Enable Control

The MP4688 has a dedicated enable control pin

(EN) with the positive logic. Its falling threshold

is a precision 1.2V, and its rising threshold is

1.5V (300mV higher).

The power MOSFET current is also accurately

sensed via a current sense MOSFET. If the

current is over 3.2A, the IC is shut down. This

offers extra protection under output short

conditions.

When floating, EN is pulled up to about 3.0V by

an internal 1µA current source so it is enabled.

To pull it down, over 1µA current capability is

needed.

Floating Driver and Bootstrap Charging

The floating power MOSFET driver is powered

by an external bootstrap capacitor. This floating

driver has its own UVLO protection. This

UVLO’s rising threshold is 2.2V with a threshold

of 150mV.

The bootstrap capacitor is charged and

regulated to about 5V by the dedicated internal

bootstrap regulator.

In case the internal circuit does not have

sufficient voltage and the bootstrap capacitor is

not well charged, extra external circuitry can be

used to ensure the bootstrap voltage is in the

normal operational region. Refer to External

Bootstrap Diode in Application section.

Under-Voltage Lockout (UVLO)

Under-voltage lockout (UVLO) is implemented

to protect the chip from operating at insufficient

supply voltage. The UVLO rising threshold is

about 4.0V while its falling threshold is a

consistent 3.65V.

MP4688 Rev. 1.12

3/28/2012

www.MonolithicPower.com

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

1...4 5 678 9 10 11

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与MP4688DN-Z相关器件

型号	品牌	描述	获取价格	数据表
MP4688DS	MPS	80V Input, 1A High Power LED Driver	获取价格
MP4689	MPS	100V Input, 1A High Power LED Driver	获取价格
MP4689A	MPS	100V Input, 1A, High-Power LED Driver	获取价格
MP4689AGN	MPS	100V Input, 1A, High-Power LED Driver	获取价格
MP4689DN	MPS	100V Input, 1A High Power LED Driver	获取价格
MP4690	MPS	Smart Bypass For LED Open Protection	获取价格

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