Datasheet > A8515

A8515

更新时间： 2022-06-05 22:00:32

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器显示器
页数	文件大小	规格书
34页	1183K
描述
The A8515 is a multi-output white LED (WLED) driver for LCD backlighting in consumer and industrial displays.

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A8515 数据手册

A8515

Wide Input Voltage Range, High Efficiency

Fault Tolerant LED Driver

Description

Features and Benefits

• Wide input voltage range: 5 to 40 V

• Maximum LED current of 120 mA

TheA8515isamulti-outputwhiteLED(WLED)driverforLCD

backlighting in consumer and industrial displays. It integrates

• TSSOP-16 (LP) package; exposed pad offers best-in-class

thermal performance

• Typical LED accuracy of 0.5%, and 0.5% for

LED-to-LED matching

• Internal bias supply for single-supply operation (typically

between V_IN= 8 to 24 V)

• Integrated boost converter with 60 V DMOS switch with

overvoltage protection (OVP)

• Drives up to 12 series LEDs in 2 parallel strings

• Single EN/PWM pin interface for both PWM dimming

and enable function

• Sync function to synchronize boost converter switching

frequencies up to 2.3 MHz, this gives the designer the

ability minimize component size

a current-mode boost converter with an internal power DMOS

switch and two current sinks. The boost converter can drive

up to 24 LEDs: 12 LEDs per string at 120 mA. The LED sinks

can be paralleled together to achieve higher LED currents,

up to 240 mA. The A8515 can operate from a single power

supply, from 5 to 40 V.

PWM dimming is implemented with an external PWM input

signal. The EN/PWM dimming pin is used to control the LED

intensity by using pulse width modulation.

The low, 720 mV regulation voltage on the LED current

sources reduces power loss and improves efficiency.

TheA8515 is provided in a 16-pinTSSOPpackage (suffix LP)

with an exposed thermal pad. It is lead (Pb) free, with 100%

matte tin leadframe plating.

• Provides driver for external PMOS input disconnect switch

• Protection features:

▫ Open or shorted V_LEDpin protection

▫ Open Schottky protection

▫ Cycle-by-cycle current limit

▫ Overtemperature protection (OTP)

Applications

▫ Output short circuit protection

• Desktop LCD flat panel displays (FPD)

• Flat panel video displays

• LCD TVs and monitors

Package: 16-pin TSSOP with exposed

thermal pad (suffix LP)

Not to scale

Typical Application Diagram

10 μH

2 A /60 V

10 to 14 V

OUT

GATE

4.7 μF/ 50 V

4.7 μF

OVP

VSENSE

VIN

VDD

158 kΩ

50 V

OVP

A8515

PAD

0.1 μF

VDD

100 kΩ

10 LEDs

each string

FAULT

EN/PWM

APWM

LED1

LED2

COMP

ISET

150 Ω

Figure 1. Typical Application Circuit;

12 V input, output to 20 LEDs

(10 series LEDs in each of two

strings) at 120 mA each.

FSET

ISET

10 kΩ

8.25 kΩ

FSET

120 pF

AGND

PGND

0.47 μF

A8515-DS, Rev. 2

12 3 4 5 6 7...34

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