Datasheet > A8518-1

A8518-1

更新时间： 2022-02-26 11:34:59

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
30页	1458K
描述
Fully integrated 42 V MOSFET for boost converter

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数据手册

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A8518-1 数据手册

Wide Input Voltage Range, High-Efficiency,

Fault-Tolerant LED Driver

A8518 and A8518-1

FEATURES AND BENEFITS (continued)

DESCRIPTION (continued)

• LED string current-matching accuracy 0.8%

• Protection against:

The A8518 has a fixed boost switching frequencies of 2.15 MHz.

The high switching frequency allows the converter to operate above

the AM radio band.

□ Shorted boost switch, inductor or output capacitor

□ Shorted I_SETresistor

□ Open or shorted LED pins and LED strings

□ Open boost diode

The A8518 offers dithering of boost switching frequency, which

helps reduce EMI (electromagnetic interference). The A8518-1 is

identical to the A8518, but without the dithering feature.

□ Overtemperature

SELECTION GUIDE

Operating Ambient

Frequency

Temperature Range

T_A, (°C)

Part Number

Package

Packaging

Leadframe Plating

Dithering

16-Pin TSSOP with

exposed thermal pad

A8518KLPTR-T

–40 to 125

Yes

4000 pieces per reel

Contact Factory

100% matte tin

16-Pin TSSOP with

exposed thermal pad

A8518KLPTR-T-1

Contact Allegro for additional packing options.

Table of Contents

Analog Dimming

Specifications

LED String Short Detect

Overvoltage Protection

Boost Switch Overcurrent Protection

Input Overcurrent Protection and

Disconnect Switch

Setting the Current Sense Resistor

Input UVLO

VDD

Shutdown

Dithering Feature

Fault Protection During Operation

Application Information

Design Example

Absolute Maximum Ratings

Thermal Characteristics

Functional Block Diagram

Pinout Diagram and Terminal List

Electrical Characteristics

Characteristic Performance

Functional Description

Enabling the IC

Powering Up: LED Pin Short-to-GND Check

Powering Up: Boost Output Undervoltage

Soft-Start Function

LED Current Setting and LED Dimming

PWM Dimming

Package Outline Diagram

APWM Pin

Extending LED Dimming Ratio

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

123 4 5 6 7...30

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