IR IRDC3477 SupIRBuck 15A DC电源解决方案

发布时间：2011-9-24 23:55 发布者：1046235000

IR公司的IRDC3477是 SupIRBuck容易使用全集成高效15A DC/DC电压稳压器.输入电压3V-27V,输出电压0.5V-12V,连续提供15A的负载电流,非常低的输出电流具有极好的效率,可编程开关频率和软起动,过流保护热补偿,内有精密的基准电压(0.5V, +/‐1%),主要用在笔记本和台式电脑,消费类电子如STB,LCD,TV和打印机等,12V和24V分布式电源,通用POL DC/DC转换器,游戏控制台和图像卡.本文介绍了IR3477主要特性,功能框图, 基本应用电路图和IR3477演示板电路图与材料清单,以及IR3477M 评估板特性, 评估板电路图和IR3477M 评估板材料清单与PCB元件布局图.

The IR3477 SupIRBuckTM is an easy‐to‐use, fully integrated and highly efficient DC/DC voltage regulator. The onboard constant on time hysteretic controller and MOSFETs make IR3477 a space‐efficient solution that delivers up to 15A of precisely controlled output voltage.

Programmable switching frequency, soft start, and thermally compensated over current protection allows for a very flexible solution suitable for many different applications and an ideal choice for battery powered applications.

Additional features include pre‐bias startup, very precise 0.5V reference, under/over voltage shutdown, thermal protection, power good output, and enable input with voltage monitoring capability.

IR3477主要特性:

 Input Voltage Range: 3V to 27V

 Output Voltage Range: 0.5V to 12V

 Continuous 15A Load Capability

 Constant On‐Time Control

 Compensation Loop not Required

 Excellent Efficiency at Very Low Output Currents

 Programmable Switching Frequency and Soft Start

 Thermally Compensated Over Current Protection

 Power Good Output

 Precision Voltage Reference (0.5V, +/‐1%)

 Enable Input with Voltage Monitoring Capability

 Pre‐bias Start Up

 Thermal Shut Down

 Under/Over Voltage Fault Protection

 Forced Continuous Conduction Mode Option

 Small, Low Profile 5mm x 6mm QFN Package

IR3477应用:

 Notebook and Desktop Computers

 Consumer Electronics – STB, LCD, TV, Printers

 12V and 24V Distributed Power Systems

 General Purpose POL DC‐DC Converters

 Game Consoles and Graphics Cards

图1. IR3477方框图

图2. IR3477基本应用电路图

图3. IR3477演示板电路图: VOUT = 1.05V, FS = 300kHz
演示板材料清单(BOM):

IR3477M 评估板

The IR3477 SupIRBuckTM is an easy-to-use, fully integrated and highly efficient DC/DC voltage regulator. The onboard constant on time hysteretic controller and MOSFETs make IR3477 a space-efficient solution that delivers up to 15A of precisely controlled output voltage. IR3477 is housed in a 20-lead 5mmx6mm QFN package.

Key features offered by IR3477 include: programmable switching frequency, soft start, temperature compensated over current protection, and thermal shutdown allowing a very flexible solution suitable for many different applications and an ideal choice for battery powered applications.

Additional features include pre-bias startup, a very precise 0.5V reference, forced continuous conduction mode option, over/under voltage protection, power good output, and enable input with voltage monitoring capability.

This user guide contains the schematic, bill of materials, and operating instructions of the IRDC3477 evaluation board. Detailed product specifications, application information and performance curves at different operating conditions are available in the IR3477 data sheet.

IR3477M 评估板特性:

VIN = +12V

VCC = +5V

VOUT = +1.05V

IOUT = 0 to 15A

FS = 300kHz @ CCM

L = 1μH

CIN = 22μF (ceramic 1210) + 68μF (electrolytic)

COUT = 47μF (ceramic 0805) + 330μF (PC-CON)