Instrukcja obsługi Microchip AT9919

Przeczytaj poniżej 📖 instrukcję obsługi w języku polskim dla Microchip AT9919 (16 stron) w kategorii Niesklasyfikowane. Ta instrukcja była pomocna dla 11 osób i została oceniona przez 7 użytkowników na średnio 4.7 gwiazdek

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2016-2022 Microchip Technology Inc. and its subsidiariesDS20005595B-page 1

AT9919

Features

•AEC-Q100 Qualified

•Hysteretic Control with High-side Current Sensing

•Wide Input Voltage Range: 4.5V to 40V

•>90% Efficiency

•Typical ±5% LED Current Accuracy

•Up to 2MHz Switching Frequency

•Adjustable Constant LED Current

•Analog or Pulse-Width Modulation (PWM) Control

Signal for PWM Dimming

•Overtemperature Protection

•–40ºC to +125ºC Operating Temperature Range

Applications

•LED Lighting Applications

•Automotive Applications

General Description

AT9919 is a PWM controller IC designed to drive

high-brightness LEDs using a buck topology. It

operates from an input voltage of 4.5 VDC to 40 VDC

and employs hysteretic control with a high-side current

sense resistor to set the constant output current.

The operating frequency range can be set by selecting

the proper inductor. Operation at high switching

frequency is possible since the hysteretic control

maintains accuracy even at high frequencies. This

permits the use of small inductors and capacitors,

minimizing space and cost in the overall system.

LED brightness control is achieved with PWM dimming

from an analog or PWM input signal. Unique PWM

circuitry allows true constant color with a high dimming

range. The dimming frequency is programmed using a

single external capacitor.

AT9919 comes in a small, 8-Lead WDFN package and

is qualified for LED lighting applications.

AT9919 passes the automotive AEC-Q100 reliability

testing.

Package Type

8-Lead WDFN

(Top View)

See Table 2-1for pin information.

8

1

2

3

4

7

6

5

CS

VIN

GATE

RAMP

ADIM

GND

VDD

DIM

GND

Hysteretic Buck High-Brightness LED Driver with

High-Side Current Sensing

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