PA60 查看數據表（PDF） - Cirrus Logic

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PA60

High Voltage Power Operational Amplifiers

Cirrus Logic 

PA60

Product Innova tionFrom

GENERAL

Please read Application Note 1 "General Operating Consider-

ations" which covers stability, supplies, heatsinking, mounting,

SOA interpretation, and specification interpretation.Visit www.

Cirrus.com for design tools that help automate tasks such as

calculations for stability, internal power dissipation, heatsink

selection;Apex's complete Application Notes library;Technical

Seminar Workbook; and Evaluation Kits.

STABILITY CONSIDERATIONS

All monolithic power op

amps use output stage

+

topologies that present

special stability problems.

This is primarily due to

–

non-complementary (both

CSN

0.01µF

devices are NPN) output

stages with a mismatch in

RSN

gain and phase response

10Ω

for different polarities of

output current. It is difficult

for the op amp manufacturer

to optimize compensation

FIGURE 4. R-C Snubber

for all operating conditions. For applications with load current

exceeding 300mA, oscillation may appear. The oscillation may

occur only with the output voltage swing at the negative or

positive half cycle. Under most operating and load conditions

acceptable stability can be achieved by providing a series RC

snubber network connected from the output to ground (see

Figure 4). The recommended component values of the of the

network are,RSN = 10Ω and CSN = 0.01µF. Please refer to Ap-

plication Note 1 for further details.

SAFE OPERATING AREA (SOA)

The SOA curves combine the effect of all limits for this power

op amp. For a given application, the direction and magnitude

of the output current should be calculated or measured and

checked against the SOA curves. This is simple for resistive

loads but more complex for reactive and EMF generating loads.

The following guidelines may save extensive analytical efforts.

THERMAL CONSIDERATIONS

The PA60EU has a large exposed copper heat tab to which

the monolithic is directly attached. The PA60EU may require a

thermal washer, which is electrically insulating since the tab

is directly tied to -VS. This can result in a thermal impedance

RCS of up to 1˚C/W or greater.

SOA PA60EU

10

(A+B) AMPLIFIERS LOADED

(A) AMPLIFIER LOADED

1

DC, TC = 25°C

DC, TC = 85°C

0.1

1

10

100

SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, VS - VO, (V)

POWER DERATING

35

30

(A+B) AMPLIFIERS

25

20

15

10

(A) AMPLIFIER

5

0

0

25

50

75

100

125

CASE TEMPERATURE, T C (C)

MOUNTING PRECAUTIONS

1. Always use a heat sink. Even unloaded the PA60EU can

dissipate up to .4 watts.

2. Avoid bending the leads. Such action can lead to internal

damage.

3. Always fasten the tab of the EU package to the heat sink

before the leads are soldered to fixed terminals.

4. Strain relief must be provided if there is any probability of

axial stress to the leads.

4

PA60U

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