A8514 데이터 시트보기 (PDF) - Allegro MicroSystems

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A8514

Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver

Allegro MicroSystems 

A8514

Wide Input Voltage Range, High Efficiency

Fault Tolerant LED Driver

Thermal Characteristics may require derating at maximum conditions, see application information

Characteristic

Symbol

Test Conditions*

Value

On 2-layer PCB, 3 in2.

40.0

Package Thermal Resistance

RθJA

On 4-layer PCB based on JEDEC standard

(estimated)

29.0

*Additional thermal information available on the Allegro website

Unit

ºC/W

ºC/W

Pin-out Diagram

GATE 1

VSENSE 2

VIN 3

FAULT 4

COMP 5

APWM 6

PWM/EN 7

FSET/SYNC 8

ISET 9

AGND 10

20 SW

19 OVP

18 PGND

17 PGND

16 PGND

15 VDD

14 LED1

13 LED2

12 LED3

11 LED4

Terminal List Table

Number

Name

1

GATE

2

VSENSE

3

VIN

4

¯F¯ ¯A ¯¯U ¯¯L¯ ¯T¯

5

COMP

6

APWM

7

PWM/EN

8

FSET/SYNC

9

10

11,12,13,14

15

16,17.18

19

20

–

ISET

AGND

LEDx

VDD

PGND

OVP

SW

PAD

Function

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

Connect this pin to the negative sense side of the current sense resistor RSC. The threshold

voltage is measured as VIN – VSENSE . There is also a fixed current sink to allow for trip

threshold adjustment.

Input power to the A8514 as well as the positive input used for current sense resistor.

Indicates a fault condition. Connect a 100 kΩ resistor between this pin and the required logic

level voltage. The pin is an open drain type configuration that will be pulled low when a fault

occurs.

Output of the error amplifier and compensation node. Connect a series RZ-CZ network from

this pin to ground for control loop compensation.

Analog trimming option for dimming. Applying a digital PWM signal to this pin adjusts the

internal ISET current.

PWM dimming pin, used to control the LED intensity by using pulse width modulation. Also

used to enable the A8514.

Frequency/synchronization pin. A resistor RFSET from this pin to ground sets the switching

frequency. This pin can also be used to synchronize two or more A8514s in the system. The

maximum synchronization frequency is 2.3 MHz.

Connect the RISET resistor between this pin and ground to set the 100% LED current.

LED signal ground.

Connect the cathodes of the LED strings to these pins.

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

Power ground for internal DMOS device.

Overvoltage Condition (OVP) sense; connect the ROVP resistor from VOUT to this pin to

adjust the overvoltage protection.

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

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 vias, directly in the pad.

Allegro MicroSystems, Inc.

3

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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