PA40 데이터 시트보기 (PDF) - Unspecified

부품명

상세내역

일치하는 목록

PA40

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER

Unspecified 

PA40

OPERATING

CONSIDERATIONS

GENERAL

Please read Application Note 1 "General Operating

Considerations" which covers stability, supplies, heat sinking,

mounting, current limit, SOA interpretation, and specification

interpretation. Visit www.apexmicrotech.com for design tools

that help automate tasks such as calculations for stability,

internal power dissipation, current limit; heat sink selection;

Apex’s complete Application Notes library; Technical Seminar

Workbook; and Evaluation Kits.

INPUT PROTECTION

The PA40 inputs are protected against common mode

voltages up the supply rails and differential voltages up to

±16 volts as well as static discharge. Differential voltages

exceeding 16 volts will be clipped by the protection circuitry.

However, if more than a few milliamps of current is available

from the overload source, the protection circuitry could be

destroyed. The protection circuitry includes 300 ohm current

limiting resistors at each input, but this may be insufficient

for severe overloads. It may be necessary to add external

resistors to the application circuit where severe overload

conditions are expected. Limiting input current to 1mA will

prevent damage.

STABILITY

The PA40 has sufficient phase margin when compensated

for unity gain to be stable with capacitive loads of at least

10 nF. However, the low pass circuit created by the sumpoint

(–in) capacitance and the feedback network may add phase

shift and cause instabilities. As a general rule, the sumpoint

load resistance (input and feedback resistors in parallel)

should be 1K ohm or less at low gain settings (up to 10).

Alternatively, use a bypass capacitor across the feedback

resistor. The time constant of the feedback resistor and bypass

capacitor combination should match the time constant of the

sumpoint resistance and sumpoint capacitance.

The PA40 is externally compensated and performance can

be tailored to the application. Use the graphs of small signal

gain and phase response as well as the graphs for slew rate

and power response as a guide. The compensation capacitor

CC must be rated at 250V working voltage. The compensation

capacitor and associated resistor RC must be mounted closely

to the amplifier pins to avoid spurious oscillation. An NPO

capacitor is recommended for compensation.

SAFE OPERATING AREA (SOA)

The MOSFET output stage of this power operational

amplifier has two distinct limitations:

1. The current handling capability of the die metallization.

2. The temperature of the output MOSFETs.

NOTE: The output stage is protected against transient

flyback. However, for protection against sustained, high energy

flyback, external fast-recovery diodes should be used.

200

120

100

50

40

30

20

10

5

4

3

2

10

PA40 SOA

200mS

300mS

DC,

T

C

=

DC, TC

85°C

= 25°C

20 30 50

100 200 300 500

ATPhEisXdaMtaIsChReeOt ThEasCbHeeNnOcLarOefGulYly cChOecRkePdOaRndAiTsIbOelNiev•ed 5to9b8e0reNliaObRleT, HhowSeHveAr,NnNo OreNspoRnOsiAbiDlity•isTaUssCumSOedNf,orApRosIsZibOleNiAnac8cu5r7ac4ie1s o•r oUmSisAsio•ns.AAPllPsLpIeCciAfiTcaItOioNnsSarHeOsuTbLjIecNtEt:o c1ha(n8ge00wi)th5ou4t6n-o2ti7ce3.9

PA40U REV. B JUNE 2001 © 2001 Apex Microtechnology Corp.

Share Link: