Voltage Amplifier for Electrostatic Microactuators

PA85A_poweramp2.JPG

Most electrostatic micro actuators need driving voltage over 100 V at DC to 100 kHz range. Apex microtechnolgy offers operation amplifiers for high-voltage applications. Their Op-Amp PA85A is one of the best amplifiers for most MEMS capacitive actuators. The maximum output voltage is 450 V (+/- 225 V) at 200 mA. Its slew rate is as large as 1000 V/microsecond. PA85A package is a 8-pin metal can. They also offer the same chip in a single-inline mold package (PA98 data sheet). The package becomes hot during operation. Do not forget to put a heat sink of over 4.2 degreeC/Watt. Please read the data sheet carefully before building this amp. In particular, choose appropriate values for the phase compensation and current limiter.

12ch_amp.JPG
12ch_amp_inside.JPG

The above circuits diagram is for a voltage amplifier of a gain of 50x. Use a potentiometer for the 1 kOhm resister at the inverting input. Diodes between the inverting and non-inverting inputs are for overload protection. Diodes between the power lines and op-amp are fool-proof for the wrong polarity of the power supply.

Reference

Errata

  1. Use 0.1 A fuse. The PCB (below) says 0.5 A but it is WRONG. (Feb. 6, 2000)
  2. You may copy the following layout to make your printed circuit board. E-mail to me for a MacDrawPro data file of this.
    PA85amplayout.JPG

Call for Papers

Societies

Publication List


ひみつの研究道具箱
himitsu.png

Makerspace Camp Komaba IV
makerspace.jpg

Introduction to Dept. Informatics and Electronics, IIS
IIS3.jpg

延岡高校同窓会・東京延友会
Nobeoka.png


トップ   編集 凍結 差分 履歴 添付 複製 名前変更 リロード   新規 一覧 検索 最終更新   ヘルプ   最終更新のRSS
Last-modified: 2023-08-12 (土) 15:16:42