Datasheet > ACT4303YH-T

ACT4303YH-T

更新时间： 2022-04-13 02:36:12

品牌	Logo	应用领域
技领 - ACTIVE-SEMI		转换器传感器
页数	文件大小	规格书
15页	622K
描述
30V/3A Sensorless CC/CV Step-Down DC/DC Converter

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ACT4303YH-T 数据手册

ACT4303

Active- Semi

Rev 0, 05-Dec-11

30V/3A Sensorless CC/CV Step-Down DC/DC Converter

FEATURES

APPLICATIONS

• 32V Input Voltage Surge

• 30V Steady State Input Voltage

• Up to 3A Output Current

• Output Voltage up to 12V

• USB Chargers

• LCD TV and Monitors

• Digital Video Recorders

• Set-Top Box

• Battery Chargers

• General-Purpose CC/CV Power Supplies

• Patent Pending Active CC Sensorless Constant

Current Control

− Integrated Current Control Improves

Efficiency, Lowers Cost, and Reduces

Component Count

GENERAL DESCRIPTION

ACT4303 is a wide input voltage, high efficiency

Active CC step-down DC/DC converter that

operates in either CV (Constant Output Voltage)

mode or CC (Constant Output Current) mode.

ACT4303 provides up to 3A output current at

225kHz switching frequency.

• Resistor Programmable Current Limit from 1.5A

to 3A

• ±7.5% CC Accuracy

− Compensation of Input /Output Voltage Change

− Temperature Compensation

− Independent of inductance and Inductor DCR

• 2% Feedback Voltage Accuracy

• Up to 94% Efficiency

• 225kHz Switching Frequency Eases EMI Design

• Advanced Feature Set

Active CC is a patent-pending control scheme to

achieve highest accuracy sensorless constant

current control. Active CC eliminates the expensive,

high accuracy current sense resistor, making it ideal

for battery charging applications and adaptors with

accurate current limit. The ACT4303 achieves

higher efficiency than traditional constant current

switching regulators by eliminating its associated

power loss.

− Integrated Soft Start

− Thermal Shutdown

− Secondary Cycle-by-Cycle Current Limit

− Protection Against Shorted ISET Pin

• SOP-8EP Package

Protection features include cycle-by-cycle current

limit, thermal shutdown, and frequency foldback at

short circuit. The devices are available in a SOP-

8EP package and require very few external devices

for operation.

CC/CV Curve

6.0

22nF

HSB

Input 10V~30V

V_IN= 24V

5.0

L1 30µH

R2 52k

ACT4303

4.0

ISET GND

COMP

V_IN= 12V

3.0

2.0

1.0

0.0

47µF

2.2nF

10k

SK34

100µF

11.5k

8.2k

0.4

0.8

1.2

1.6

2.0

2.4

2.8

3.2

Output Current (A)

Innovative Power^TM

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