Datasheet > A8503

A8503

更新时间： 2024-02-07 13:37:34

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器
页数	文件大小	规格书
17页	409K
描述
High Efficiency 6-Channel, 2 MHz, WLED/RGB Driver

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A8503 技术参数

生命周期：	Obsolete	Reach Compliance Code：	unknown
风险等级：	5.82	特性阻抗：	50 Ω
最大输入功率 (CW)：	46.99 dBm	最大工作频率：	4000 MHz
最小工作频率：		最高工作温度：	125 °C
最低工作温度：	-55 °C	射频/微波设备类型：	FIXED ATTENUATOR
最大电压驻波比：	1.35	Base Number Matches：	1

A8503 数据手册

A8503

High Efficiency 6-Channel, 2 MHz, WLED/RGB Driver for

Medium Displays, with Integrated 55 V Power Switch

Description

Features and Benefits

▪ Active current sharing between LED strings for ±0.6%

accuracy and matching

The A8503 is a multi-output WLED/RGB LED driver for

medium-size LCD backlighting. It integrates a current-mode

boost converter with internal power switch and six current

sinks. The boost converter can provide output voltages up to

47 V. The boost converter can drive up to 72 LEDs at 20 mA

per LED with a battery voltage down to 5 V. The LED sinks

are capable of sinking up to 32 mA each, and can also be

paralleled together to achieve even higher LED currents. The

A8503 provides protection against overvoltage, open diode,

open or shorted LED string, and overtemperature. A dual

level cycle-by-cycle current limit function provides soft start

and protects against overloads. A soft start timeout monitor is

provided to enhance protection when starting up into a fault

condition.

▪ Drives up to 12 series × 6 parallel = 72 LEDs (V_f= 3.2 V,

I_f= 20 mA) at 5 V

▫ Each individual current sink is capable of 32 mA

▫ Adjustable overvoltage protection (OVP)

▪ 600 kHz to 2 MHz adjustable switching frequency

▫ Open or shorted LED string protection

▫ Open Schottky diode protection

▫ Overtemperature, cycle-by-cycle current limit,

undervoltage, and soft start time-out protections

▫ Selectable latched/auto-restart protection modes

▪ No audible MLCC noise during PWM dimming

▪ No pull-up resistors required for LED modules that use

ESD capacitors

When the MODE pin is set low, the A8503 latches on a fault,

and can be re-enabled only by cycling the input voltage, V_IN,

or by toggling the EN pin. Connecting the MODE pin high

provides auto-restart after fault events. The A8503 features

Continued on the next page…

Package: 26 contact MLP/QFN (suffix EC)

Continued on the next page…

Applications

▪ Notebook and sub-notebook displays

▪ LCD monitors

▪ LCD panels

Approximate size

Typical Application

V_BAT

5 to 22 V

4.7 μF

35 V

10 μH

BAT

OVP

OUT

2.2 μF

4.3 to 5.5 V

SW SW

OVP

VIN

PULLUP

0.1 μF

FAULT

FSET

A8503

LED1

FSET

LED2

LED3

LED4

LED5

LED6

PAD

COMP

1 μF

Shutdown Enable

Off Off Off On Off

MODE

PWM

ISET

AGND PGND PGND DGND LGND

LED State

ISET

Figure 1. Typical application circuit

8503-DS

12 3 4 5 6 7...17

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