>
首页 » 解决方案 » Supertex MD7120 D类放大方案

Supertex MD7120 D类放大方案

作者:  时间:2008-07-25 12:17  来源:eaw
Supertex公司的MD7120是该速200V全H桥MOSFET驱动器,非常适合D类音频放大器和其它高频PWM驱动方面的应用如压电激励器,开关电源中的MOSFET驱动器或半桥功率级的两路驱动器.本文介绍了MD7120的主要性能,方框图,典型的应用电路以及H61典型设计电路图.

MD7120 High Speed, 200V, Full H-Bridge MOSFET Driver
The Supertex MD7120 is a high voltage, high speed, full-bridge driver. It is ideal for Class-D audio amplifier applications and other high frequency PWM driver applications, such as motor driving. This highvoltage and high-speed driver can also be used for other applications:

as a piezo-electric transducer driver;
as a MOSFET driver in a switched mode power supply;
or as a two channel driver for half-bridge power stages.
The new IC topology is designed to drive dual N-MOSFETs as power switches for both the high side and low side. It consists of controller logic circuits, level translators, and a bootstrap floating powered gate driver and over current protection circuits without using current sensing resistors. The thresholds of the OCP for the high and low side are
resistor-programmable.

The power MOSFET top drain can be connected to up to +200V while the bottom N-channel MOSFET source is grounded. They are designed to provide 3.0A peak driving current with well-matched output impendence and propagation delay on the high and low sides, as well as from device-to-device.

The EN pin serves a dual purpose: the logic high level is used to compute the threshold voltage level of inputs; and the logic low level disables the outputs. The IC is in a low inductance and thermally enhanced package.

MD7120 D主要特性:
HVCMOS® technology for high performance
All N-MOSFET full-bridge driver
Designed for 200V bridge supply voltage
Up to 1.0MHz operation frequency
Greater than 90% efficiency
Designed for low total harmonic distortion
Single voltage drive power supply +12V
Smart logic voltage threshold
Resistor programmable OCP threshold
UVP function built-in
Accurate and adjustable dead time
32-Lead QFN package

主要应用:
Class-D audio amplifier
High frequency PWM motor control
High frequency switching power supply
Ultrasound transducer drivers
High voltage waveform generator



图1. MD7120 框图和应用电路



图2. MD7120 典型应用电路



图3. MD7120典型设计电路图

相关推荐

大陆工业开关电源市场五大竞争阵营

西门子  开关电源  2013-04-09

飞兆与包尔英特的专利之争:初步裁定结果

飞兆  PWM  2012-05-03

TNY264开关电源的应用电路设计

开关电源  滤波  2011-09-22

开关电源的软起动电路

开关电源  软起动电路  2011-09-15

一种新型无源无损软开关Boost变换器

开关电源  软开关  PWM  2011-09-13

TI绿色环保PWM控制器提升电信及工业电源效率

TI  电源控制器  PWM  2011-08-26
在线研讨会
焦点