Datasheet > A8518-1

A8518-1

更新时间： 2022-02-26 11:34:59

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
30页	1458K
描述
Fully integrated 42 V MOSFET for boost converter

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A8518-1 数据手册

Wide Input Voltage Range, High-Efficiency,

Fault-Tolerant LED Driver

A8518 and A8518-1

PINOUT DIAGRAM AND TERMINAL LIST TABLE

16 LED2

15 LED1

14 AGND

13 ISET

12 APWM

11 PWM

10 VDD

COMP

PGND

OVP

VOUT

PAD

GATE

VSENSE

VIN

FAULT

Package LP, 16-Pin TSSOP Pinout Diagram

Terminal List Table

Name

Number

Function

Output of the error amplifier and compensation node. Connect a series R_Z-C_Z-C_Pnetwork from this pin to GND for control

loop compensation.

COMP

PGND

OVP

Power ground for internal N-channel MOSFET switching device.

Overvoltage protection. Connect external resistor from VOUT to this pin to adjust the overvoltage protection level.

VOUT

Connect directly to boost output voltage.

The drain of the internal N-channel MOSFET switching device of the boost converter.

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

GATE

Connect this pin to the negative sense side of the current sense resistor R_SC. The threshold voltage is measured as V_IN-

V_SENSE. There is also fixed current sink to allow for trip threshold adjustment.

VSENSE

VIN

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

The pin is an open-drain type configuration that will be pulled low when a fault occurs. Connect a 100 kΩ resistor between

this pin and desired logic level voltage.

FAULT

VDD

Output of internal LDO (bias regulator). Connect a 1 µF decoupling capacitor between this pin and GND.

Enables the IC when this pin is pulled high. Also serves to control the LED intensity by using pulse-width modulation.

Typical PWM dimming frequency is in the range of 100 to 400 Hz.

PWM

APWM

ISET

Analog trimming option or dimming. Applying a digital PWM signal to this pin adjusts the internal ISET current.

Connect R_ISETresistor between this pin and GND to set the desired LED current setting.

LED current ground. Connect to PCB ground plane.

AGND

LED current sink #1. Connect the cathode of LED string to associated pin. Unused LEDx pin must be terminated to GND

through a 1.54 kΩ resistor.

–

LED1

LED2

PAD

LED current sink #2. Connect the cathode of LED string to associated pin. Unused LEDx pin must be terminated to GND

through a 1.54 kΩ resistor.

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, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

1 2 3 456 7 8...30

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