PA13 • PA13A

4

PA13U

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

POWER RATING

Notallvendorsusethesamemethodtoratethepowerhan-

dling capability of a Power OpAmp.Apex Precision Power

rates the internal dissipation, which is consistent with rating

methodsusedbytransistormanufacturersandgivesconser-

vative results. Rating delivered power is highly application

dependent and therefore can be misleading. For example,

the135WinternaldissipationratingofthePA13couldbeex-

pressedasanoutputratingof260Wforaudio(sinewave)or

as440WifusingasingleendedDCload.Pleasenotethatall

vendorsratemaximumpowerusinganinfiniteheatsink.

THERMAL STABILITY

Apex Precision Power has eliminated the tendency of class

A/B output stages toward thermal runaway and thus has

vastlyincreasedamplifierreliability.Thisfeature,notfoundin

most other Power OpAmps, was pioneered byApex Preci-

sionPowerin1981usingthermistorswhichassureanegative

temperaturecoefficientinthequiescentcurrent.Thereliability

benefitsofthisaddedcircuitryfaroutweightheslightincrease

incomponentcount.

TYPICAL PERFORMANCE GRAPHS

–V =

L * 1

t

YOKE DRIVER:

47µF

.1µF

.1µF

47µF

–22V

+73V

R

1K

R

.2Ω

C

50pF

R

2K

11,12

2

1

5,6

3

R

.5Ω

7.8mH

4Ω

5Ap-p

D

F

CL+

F

S

HIGH CURRENT ASYMMETRICAL SUPPLY

7,8

9,10

R

.2Ω

CL–

PA13

TYPICAL APPLICATION

–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