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

Wide Input Voltage Range, High Efficiency

Fault Tolerant LED Driver

A8515

Pin-out Diagram

VDD

PGND

OVP

LED2

LED1

AGND

ISET

PAD

GATE

VSENSE

VIN

FSET/SYNC

EN/PWM

APWM

COMP

FAULT

Terminal List Table

Number

Name

Function

VDD

Output of internal LDO; connect a 0.1 μF decoupling capacitor between this pin and GND.

PGND

Power ground for internal NMOS device.

This pin is used to sense an overvoltage condition; connect the R_OVPresistor from V_OUTto this

pin to adjust the Overvoltage Protection function (OVP).

OVP

The drain of the internal NMOS switch of the boost converter.

GATE

Output gate driver pin for external P-channel FET control.

Connect this pin to the negative sense side of the current sense resistor R_SC; the threshold

VSENSE

VIN

voltage is measured as V_IN– V_SENSE

Input power to the A8515 as well as the positive input used for the current sense resistor.

This pin is used to indicate a fault condition, it is an open drain type configuration that will be

pulled low when a fault occurs; connect a 100 kΩ resistor between this pin and the required

logic level voltage.

¯¯¯¯¯¯¯¯¯

FAULT

Output of the error amplifier and compensation node; connect a series R_ZC_Znetwork from this

pin to GND for control loop compensation.

COMP

APWM

Analog trimming option or dimming; applying a digital PWM signal to this pin adjusts the internal

I_SETcurrent.

PWM dimming pin used to control the LED intensity by using pulse width modulation; the typical

PWM dimming frequency is in the range of 200 Hz to 1 kHz.

EN/PWM

Frequency/synchronization pin; connect a resistor R_FSETfrom this pin to GND to set the

FSET/SYNC switching frequency. This pin can also be used to synchronize two or more converters in the

system; the maximum synchronization frequency is 2.3 MHz.

ISET

AGND

LED1

LED2

Connect the R_ISETresistor between this pin and GND to set the LED 100% current level.

LED signal ground.

Connect the cathode of the LED string to this pin.

Exposed pad of the package providing enhanced thermal dissipation; this pad must be

connected to the ground plane(s) of the PCB with at least 8 thermal vias, directly in the pad.

–

PAD

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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