PA13 • PA13A

PA13U

5

P r o d u c t I n n o v a t i o n F r o m

®

–50

0

100

.7

1.9

2.2

BIAS CURRENT

1.3

.4

10

100

10K

.1M

FREQUENCY, F (Hz)

1

100

10M

FREQUENCY, F (Hz)

–20

0

60

120

SMALL SIGNAL RESPONSE

20

40

80

100

1

100

.1M

10M

–210

–150

–60

0

PHASE RESPONSE

–90

–30

10K

20K

50K

.1M

FREQUENCY, F (Hz)

4.6

100

1K

3K

.1M

FREQUENCY, F (Hz)

.003

.3

3

HARMONIC DISTORTION

.01

.1

1

40

100

TOTAL SUPPLY VOLTAGE, V

.4

.6

1.6

QUIESCENT CURRENT

.8

1.4

0

OUTPUT CURRENT, I

OUTPUT VOLTAGE SWING

1

10K

FREQUENCY, F (Hz)

0

COMMON MODE REJECTION

40

80

120

.1M

10

100

0

TIME, t (µs)

PULSE RESPONSE

–50 –25

50

100

CASE TEMPERATURE, T

0

15.0

CURRENT LIMIT

12.5

300

10K 30K

1

INPUT NOISE

1K

10

20

30

1K

–25

25

50

75

1.6

POWER RESPONSE

30K

50

60

70

80

90

1.2

0

25

75

5.0

7.5

-8

10

1K 10K .1M 1M

10

10K

1M

FREQUENCY, F (Hz)

2.5

10.0

1K

1M

20

60

100

2

4

6

8

10 12

-6

-4

-2

0

2

4

6

8

70K

6.8

10

15

22

32

46

68

100

.03

1.0

125

1.0

125

17.5

CASE TEMPERATURE, T

–180

–120

40

50

70

100

2.5

3

6

9

12

15

2

3

4

5

6

R

R

V

0

V

24V

V

V

| +V

| +V

| +V

V

= 100mW

T

–25°C

= 4W

A

V

R

=

120W

T

25°C

T

85°C

T

125°C

–V

O

+V

O

0

20

40

60

80 100 120

CASE TEMPERATURE, T

0

20

60

100

POWER DERATING

40

140

140

80

120

PA13

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.Cirrus.com for design tools

that help automate tasks such as calculations for stability, internal power dissipation, current limit; heat sink selec-

tion; Apex Precision Power’s complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits.

SAFE OPERATING AREA (SOA)

The output stage of most power amplifiers has three distinct

limitations:

1. The current handling capability of the transistor geometry

and the wire bonds.

2. The second breakdown effect which occurs whenever the

simultaneous collector current and collector-emitter volt-

age exceeds specified limits.

3. The junction temperature of the output transistors.

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. However, the following guidelines may save extensive

analytical efforts.

T

25°C

T

85°C

THERMAL

SOA

20

50

70

90

40

30

10

SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, V

15

.6

.4

10

6.0

4.0

2.0

3.0

1.0