TI公司的TPS56221是高效大電流同步降壓直流轉(zhuǎn)換器,工作電壓4.5V-14V,輸出電壓低至0.6V,負(fù)載電流高達(dá)25A.集成的NexFET? 功率MOSFET使得占位面積小和容易使用.固定頻率選擇: 300 kHz, 500 kHz和1 MHz,可編程軟起動(dòng),600mV基準(zhǔn)電壓精度1%,高邊和低邊MOSFET R_DS(on)檢測(cè),主要用在POL電源模塊,電信和網(wǎng)絡(luò)設(shè)備用的高密度DC/DC轉(zhuǎn)換器.本文介紹了TPS56221主要特性, 功能方框圖, 簡(jiǎn)化應(yīng)用電路圖和TPS56221EVM-579評(píng)估模塊主要特性,電路圖以及材料清單, 元件布局圖.

TPS56221 is a high-efficiency and high-current synchronous buck converter designed to operate from a supply between 4.5 V and 14 V. The device is capable of producing an output voltage as low as 0.6 V at loads up to 25 A. Integrated NexFET? Power MOSFETs provide a small footprint and ease of use.

The device implements a voltage-mode control with voltage feed-forward compensation that responds instantly to input voltage change.

TPS56221 is available in a thermally enhanced 22-pin PQFN (DQP) PowerPAD? package.

The device offers design flexibility with a variety of user programmable functions, including soft-start, overcurrent protection (OCP) levels, and loop compensation.

TPS56221主要特性:
??
4.5-V to 14-V Input Voltage Range
??
Incorporates Power Block Technology

Up to 25-A Output Current

Fixed Frequency Options of 300 kHz, 500 kHz and 1 MHz

High-Side and Low-Side MOSFET R_DS(on) Sensing

Programmable Soft-Start

600-mV Reference Voltage with 1% Accuracy

Voltage Mode Control with Feed-Forward

Supports Pre-Biased Output

Thermal Shutdown

22-Pin 5 mm x 6 mm PQFN PowerPAD Package

TPS56221主要應(yīng)用:

Point-of-Load (POL) Power Modules

High Density DC-DC Converters for Telecom and Networking Applications


圖1.TPS56221功能方框圖

圖2.TPS56221簡(jiǎn)化應(yīng)用電路圖

TPS56221EVM-579評(píng)估模塊

The Texas Instruments TPS56221EVM-579 evaluation module (EVM) is a synchronous buck converter providing a fixed 1.2-V output at up to 25 A from a 12-V input bus. The EVM is designed to start up from a single supply; so, no additional bias voltage is required for start-up. The module uses the TPS56221 High-Current, Synchronous Buck Converter with integrated MOSFETs. The TPS56221 integrates TI’s high-performance controller technology with TI’s industry-leading MOSFET technology in a standard QFN package to meet the demands of modern, high-current, space-constrained applications.

TPS56221EVM-579評(píng)估模塊應(yīng)用:

? High-current, low-voltage FPGA or microcontroller core supplies

? High-current, point-of-load modules

? Telecommunications equipment

? Computer peripherals

TPS56221EVM-579評(píng)估模塊主要特性:

? 8-V to 14-V input voltage rating

? 1.2-V ±2% output voltage rating

? Less than 400-mm2 active PCB area (excluding bulk input and output capacitors)

? 25-A steady-state load current

? 500-kHz switching frequency

? Simple access to IC features including Power Good, Enable, Soft-Start, and Error Amplifier

? Convenient test points for simple, non-invasive measurements of converter performance.

TPS56221EVM-579評(píng)估模塊電性能表:


圖3.TPS56221EVM-579評(píng)估模塊電路圖

TPS56221EVM-579評(píng)估模塊材清單(BOM):


圖4.TPS56221EVM-579評(píng)估模塊元件布局圖(頂視圖)
?