Datasheet > AT9933

AT9933

更新时间： 2024-09-16 14:54:43

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
16页	760K
描述
The AT9933 is a variable frequency PWM controller IC, designed to control an LED lamp driver using

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AT9933 数据手册

AT9933

Hysteretic Boost-Buck (Ćuk) LED Driver IC

Features

General Description

• Constant Current LED Driver

• Steps Input Voltage Up or Down

• Low Electromagnetic Interference (EMI)

• Variable Frequency Operation

• Internal 75V Linear Regulator

• Input and Output Current Sensing

• Input Current Limit

The AT9933 is a variable frequency PWM controller IC,

designed to control an LED lamp driver using a

low-noise boost-buck (Ćuk) topology. It uses

patent-pending Hysteretic Current-mode control to

regulate both the input and the output currents. This

enables superior input surge immunity without the

necessity for complex loop compensation. Input

current control enables current limiting during Startup,

Input Undervoltage and Output Overload conditions.

The AT9933 provides a low-frequency PWM dimming

input that can accept an external control signal with a

duty cycle of 0%–100% and a high dimming ratio.

• Enable and Pulse-width Modulation (PWM)

Dimming

• Ambient Temperature Rating of up to 125°C

This AT9933-based LED driver is ideal for LED lamps.

The part is rated for up to 125°C ambient temperatures.

Applications

• LED Lighting Applications

Package Type

8-lead SOIC

(Top View)

VIN 1

8 REF

7 CS2

CS1 2

GND 3

6 VDD

5 PWMD

GATE 4

See Table 2-1 for pin information.

 2016 Microchip Technology Inc.

DS20005597A-page 1

12 3 4 5 6 7...16

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