| Supertex MD7120 D类放大方案 |
| |
| 作者：未知 来源：Supertex 点击数：105 更新时间：2008-7-7 |
|
您可以添加到网摘 让更多人关注此文章：
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
详情请见:
http://www.supertex.com/pdf/datasheets/MD7120.pdf和http://www.supertex.com/pdf/app_notes/AN-H61.pdf
[1]
|
没有任何评论
*只显示最新10条评论。评论内容只代表网友观点，与本站立场无关。 更多评论
|
|
发帖须知：
一.所发文章必须遵守《互联网电子公告服务管理规定》;
二.严禁发布供求代理信息,公司介绍,产品信息等广告宣传信息;
三.严禁恶意重复发帖;
四.严禁对个人,实体,民族,国家等进行漫骂,污蔑,诽谤。 |
|
|
|
当前位置：
首页 >> 行业应用 >> 消费电子 >> 解决方案
相关文章
发表评论
