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| DRV2700高压500V反激转换器解决方案 |
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| 文章来源： 更新时间：2015/5/27 11:35:00 |
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TI公司的DRV2700是集成了105V升压开关,功率二极管和全差分放大器的单片压电式触觉驱动器,能驱动高压和低压压电负载,输入信号可以是差分或单端,AC或DC耦合,支持GPIO控制增益: 28.8 dB, 34.8 dB, 38.4 dB和40.7 dB,主要用在数字无线电,MP3,手持媒体播放器(PMP),PDA,电冰箱,洗衣机和笔记本电脑等.本文介绍了DRV2700主要特性,功能框图, 反激电路图, 系统框图以及DRV2700EVM-HV500反激高压评估模块主要特性,电路图和材料清单,PCB元件布局图和PCB设计图.
The DRV2700 device is a single-chip piezo driver with an integrated 105-V boost switch, integrated power diode, and integrated fully-differential amplifier. This versatile device is capable of driving both high-voltage and low-voltage piezoelectric loads. The input signal can be either differential or single-ended and AC or DC coupled. The DRV2700 device supports four GPIO-controlled gains: 28.8 dB, 34.8 dB, 38.4 dB, and 40.7 dB.
The boost voltage is set using two external resistors. The boost current-limit is programmable through the R(REXT) resistor. The boost converter architecture does not allow the demand on the supply current to exceed the limit set by the R(REXT) resistor which allows the user to optimize the DRV2700 circuit for a given inductor based on the desired performance requirements. Additionally, this boost converter is based on a hysteretic architecture to minimize switching losses and therefore increase efficiency.
A typical startup time of 1.5 ms makes the DRV2700 device an ideal piezo driver for coming out of sleep quickly. Thermal overload protection prevents the device from damage when overdriven.
DRV2700主要特性:
100-V Boost or 1-kV Flyback Configuration
±100-V Piezo Driver in Boost + Amplifier
Configuration
4 GPIO-Adjustable Gains
Differential or Single-Ended Output
Low-Voltage Control
AC and DC Output Control
0 to 1-kV Piezo Driver in Flyback Configuration
Low-Voltage Control
AC and DC Output Control
Integrated Boost or Flyback Converter
Adjustable Current-Limit
Integrated Power FET and Diode
Fast Startup Time of 1.5 ms
Wide Supply-Voltage Range of 3 to 5.5 V
4-mm × 4-mm × 0.9-mm VQFN package
1.8-V Compatible Digital Pins
Thermal Protection
图1. DRV2700功能框图
图2. DRV2700反激电路图
图3. DRV2700系统框图
DRV2700EVM-HV500反激高压评估模块
The DRV2700EVM-HV500 is an evaluation module for the DRV2700 used in a flyback converter circuit. The DRV2700 is intended for high voltage piezo applications typically used in Industrial Applications. The integrated high voltage switch enables for a small solution size circuit that can drive 500V single ended. The onboard MSP430 allows for digital control and quick prototyping.
DRV2700EVM-HV500反激高压评估模块包括:
• DRV2700EVM-HV500 evaluation board
• Demonstration mode firmware preloaded onto microcontroller
• Downloadable software to control EVM
• Mini-B USB cable
DRV2700EVM-HV500反激高压评估模块主要特性:
5V input to +500V Output
Single ended input modes
Multiple output voltage settings
Easily powered through USB or external Power Supply
Easily control output voltage
图4. DRV2700EVM-HV500反激高压评估模块外形图
图5. DRV2700EVM-HV500反激高压评估模块元件分布图
图6. DRV2700EVM-HV500反激高压评估模块电路图
图7. DRV2700EVM-HV500反激高压评估模块PCB顶层和底层布局图
DRV2700EVM-HV500反激高压评估模块材料清单:
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