A8515 데이터 시트보기 (PDF) - Allegro MicroSystems

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A8515

Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver

Allegro MicroSystems 

A8515

Wide Input Voltage Range, High Efficiency

Fault Tolerant LED Driver

Pin-out Diagram

VDD 1

PGND 2

OVP 3

SW 4

GATE 5

VSENSE 6

VIN 7

FAULT 8

16 LED2

15 LED1

14 AGND

13 ISET

PAD

12 FSET/SYNC

11 EN/PWM

10 APWM

9 COMP

Terminal List Table

Number

Name

Function

1

VDD

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

2

PGND Power ground for internal NMOS device.

3

OVP

This pin is used to sense an overvoltage condition; connect the ROVP resistor from VOUT to this

pin to adjust the Overvoltage Protection function (OVP).

4

SW

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

5

GATE

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

6

VSENSE

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

voltage is measured as VIN – VSENSE.

7

VIN

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

8

¯F¯¯A¯U¯¯L¯¯T¯ pulled low when a fault occurs; connect a 100 kΩ resistor between this pin and the required

logic level voltage.

9

COMP

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

pin to GND for control loop compensation.

10

APWM

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

ISET current.

11

EN/PWM

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.

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

12 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.

13

ISET

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

14

AGND LED signal ground.

15

LED1

Connect the cathode of the LED string to this pin.

16

LED2

Connect the cathode of the LED string to this pin.

–

PAD

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.

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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