Datasheet > MP1521_R2.7W

MP1521_R2.7W

更新时间： 2024-02-19 02:18:07

品牌	Logo	应用领域
其他 - ETC		驱动器
页数	文件大小	规格书
2页	113K
描述
High Efficiency White LED Driver

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中文翻译

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数据手册

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MP1521_R2.7W 数据手册

MP1521

High Efficiency

White LED Driver

Monolithic Power Systems

General Description

Features

The MP1521 is a constant-current Boost

On Board Power MOSFET

Drive 9 White LEDs from 2.7V Input

Drive 15 White LEDs from 5V Input

Up to 90% Efficiency

Over 80mA Output Current Capacity

Open Load Shutdown

Low Current Sensing Feedback Voltage

Up to 3 String Current Sensing Feedback

Analog and Digital PWM Brightness Control

UVLO, Thermal Shutdown

Soft Start

Internal Current Limit

Available in Compact MSOP10 and

Tiny 3 mm x 3 mm QFN16 Package

Evaluation Boards Available

Regulator.

This IC has three individual

current-sensing feedbacks, which are ideal for

driving multiple strings of series connected

LEDs. The OLS pin is designed for detecting

loose or open LED connections.

The IC uses a peak current, constant minimum

off-time architecture. The feedback pins

measure voltage across sense resistors in

series with the LED strings. When supplying a

bias current of 20mA, the voltage drop across

the sense resistor is only 0.4V to minimize

power loss. Either a DC voltage or a PWM

signal at the BRT/PWM input can control the

LED brightness.

Applications

The MP1521 has an on board power MOSFET

switch that is protected by current limit, open

load shutdown, thermal shutdown, and under

voltage lockout.

Handheld Computers, Cell phones, PDAs,

Digital and Video Cameras, Small LCD

Displays

Li Ion and NiMH Battery Applications

Ordering Information

Part Number ∗

Package

Temperature

MP1521EK

MSOP10

-20° to +85°C

MP1521EQ

EV0005

QFN16 (3x3)

-20° to +85°C

MP1521EK Evaluation Board

MP1521EQ Evaluation Board

EV0021

∗ For Tape & Reel, add suffix –Z (i.e., MP1521EK–Z)

For Lead Free, add suffix –LF (i.e., MP1521EK–LF–Z)

Typical Application Circuit (One String of Six (6) LEDs)

Efficiency vs LED current, 1 string of 6

Using Toko D62CB 47µH Inductor

V_IN

C_IN

C_OUT

GND

MP1521

100

GND

OLS

REF

OFF

V = 5V

V = 4V

V = 3V

BRT/

PWM

White LEDs

FB1

FB2

BRT/PWM

FB3

LED Current (mA)

MP1521 Rev 2.7 10/06/04

www.monolithicpower.com

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