Apex PA45 Datasheet

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER

MICROTECHNOLOGY

HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX [phone]

FEA TURES

• MONOLITHIC MOS TECHNOLOGY

• LOW COST

• HIGH VOLTAGE OPERATION—150V

• HIGH SLEW RATE—27V/µs

• HIGH POWER—5A, 85W DISSIPATION

APPLICATIONS

• MAGNETIC DEFLECTION

• PA AUDIO

• MOTOR DRIVE

• NOISE CANCELLATION

DESCRIPTION

The PA45 is a high power monolithic MOSFET operational
amplifier that achieves performance levels unavailable even in
many hybrid amplifier designs. Inputs are protected from
excessive common mode and differential mode voltages as
well as static discharge. The safe operating area (SOA) has no
second breakdown limitations and can be observed with all
type loads by choosing an appropriate current limiting resistor.
External compensation provides the user flexibility in choosing
optimum gain and bandwidth for the application.

This circuit utilizes a beryllia (BeO) substrate to minimize
thermal resistance. Ultrasonically bonded aluminum wires
provide reliable interconnections at all operating tempera­tures. The 8-pin TO-3 package is hermetically sealed and
electrically isolated. The use of compressible isolation wash­ers and/or improper mounting torque will void the product
warranty.

EQUIVALENT SCHEMATIC

PA45

PATENTED

TYPICAL APPLICATION

+80

R

C

C

3

2

V

I

4

PA45

R

I

5

6

Horizontal Deflection Coil Amplifiers

Horizontal deflection amplifiers require both high speed and
low distortion. The speed at which current can be changed in a
deflection coil is a function of the voltage available from the op
amp. In this application an 80 volt power supply is used for the
retrace polarity to provide a 7 µSec retrace time, half of which is
required for amplifier slewing. This circuit can perform 15.75
KHz deflection in up to 50µH coils at up to 5A p-p.

C

7

R

CL

8

1

–20

±2.5A 7µSec Retrace

C

F

R

D

R

F

YOKE

R

S

3

+V

S

D2

D4

–IN

5
4

+IN

–V

S

6

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Q3

Q11

Q12

D3

D1

Q24

Q8

Q13

CC1

D5

2

CC2

7

Q21Q20

D7

Q2

Q5 Q6

Q14

Q7

Q9 Q10

Q15

Q16

Q17

Q19

OUTPUT
DRIVE

8

1

CURRENT
SENSE

EXTERNAL CONNECTIONS

+V

4

+IN

C

C

R

C

C IS NPO RATED

C

FOR FULL SUPPLY VOLTAGE.

–IN

5

–V

S

CC1

S

3

TOP VIEW

6

CC2

8

DRIVE

OUTPUT

R

CL

2

7

CURRENT

SENSE

1

OUTPUT

PHASE

COMPENSATION

Gain C

≥10 10pF 1KΩ

≥1 68pF 1KΩ

C

R

C

PA45

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

SUPPLY VOLTAGE, +VS to –V
OUTPUT CURRENT, continuous within SOA 5A
POWER DISSIPATION, continuous @ TC = 25°C 85W
INPUT VOLTAGE, differential ±16 V
INPUT VOLTAGE, common mode ±V
TEMPERATURE, pin solder – 10 sec 300°C
TEMPERATURE, junction 150°C
TEMPERATURE, storage –65 to +150°C
TEMPERATURE RANGE, powered (case) –55 to +125°C

S

150V

S

SPECIFICATIONS

PARAMETER TEST CONDITIONS
INPUT

OFFSET VOLTAGE, initial 510mV
OFFSET VOLTAGE, vs. temperature Full temperature range 10 50 µV/°C
OFFSET VOLTAGE, vs supply 815µV/V
OFFSET VOLTAGE, vs time 2 µV √kh
BIAS CURRENT, initial 20
BIAS CURRENT, vs supply 2 pA/V
OFFSET CURRENT, initial 200 pA
INPUT IMPEDANCE, DC 10
INPUT CAPACITANCE 5pF
COMMON MODE, voltage range ±VS–10 V
COMMON MODE REJECTION, DC 90 106 dB
NOISE, broad band 10kHz BW, RS = 1KΩ 10 µV RMS

GAIN

OPEN LOOP at 15Hz 94 106 dB
GAIN BANDWIDTH PRODUCT @ 1MHz
POWER BANDWIDTH CC = 10pF, 130V p-p, RL = 8Ω 66 kHz
PHASE MARGIN

RL = 500Ω, CC = 10pF 4.5 MHz
Full temp range, CC = 68pF, RL = 10

1

Ω 60 °

MIN TYP MAX UNITS

100

11

pA

Ω

OUTPUT

VOLTAGE SWING IO = 5A ±VS–10 ±VS–8 V
CURRENT, continuous 5 A
SETTLING TIME to .1% 10V step, AV = –10 2 µs
SLEW RATE CC = 10pF, RL = 8Ω 27 V/µs
CAPACITIVE LOAD AV = +1, CC = 68pF 10 nF
RESISTANCE, no load RCL = 0 150 Ω

POWER SUPPLY

VOLTAGE
CURRENT, quiescent 30 50 mA

THERMAL

RESISTANCE, AC junction to case
RESISTANCE, DC junction to case
RESISTANCE, junction to air Full temperature range 30 °C/W
TEMPERATURE RANGE, case Meets full range specifications –25 +85 °C

NOTES: 1. Unless otherwise noted TC = 25°C, CC = 10pF, RC = 1KΩ. DC input specifications are ± value given. Power supply voltage is

CAUTION

3

2

typical rating.

2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation
to achieve high MTTF. For guidance, refer to heatsink data sheet.

3. Derate maximum supply voltage .5 V/°C below case temperature of 25°C. No derating is needed above TC = 25°C.

The PA45 is constructed from MOSFET transistors. ESD handling procedures must be observed.
The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or

subject to temperatures in excess of 850°C to avoid generating toxic fumes.

See Note 3 ±15 ±50 ±75 V

F > 60Hz 1.3 °C/W
F < 60Hz 1.5 °C/W

APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: [phone]

TYPICAL PERFORMANCE
GRAPHS

P A45

100

POWER DERATING

80

60

40

20

0

0 25 50 75 100 125

INTERNAL POWER DISSIPATION, P(W)

CASE TEMPERATURE, TC (°C)

SMALL SIGNAL RESPONSE

120

80

CC = 68pF

40

RL = 1KΩ

OPEN LOOP GAIN, A(dB)

0

RL = 500Ω

10 1K 10K 100K1M

.1 1 100 10M

FREQUENCY, f (Hz)

CC = 10pF

CURRENT LIMIT DRIFT

1.2

(X)

LIM

1.1

1.0

0.9

0.8

0.7
–25 25 50 75

–50 0 100

NORMALIZED CURRENT LIMIT, I

CASE TEMPERATURE, T (°C)

PHASE RESPONSE

0

–45

CC = 10pF

–90

PHASE, (°)φ

CC = 68pF

–135

RL = 500Ω

–180

10 10K 1M

1.1 100 100K 10M

1K

FREQUENCY, f (Hz)

ABSOLUTE CURRENT LIMIT

4

0

CURRENT LIMIT, I (A)

–4

125

C

0.1
CURRENT LIMIT RESISTOR, RCL (Ω)Ω

+I

LIM

-I

LIM

1.0

10

POWER RESPONSE

200

PP

100

80

O

60
40

CC = 68pF

20

RL = 8Ω

10

8
6

OUTPUT VOLTAGE, V (V )

4

10K 20K 200K100K

40K 400K 1M

FREQUENCY, f (Hz)

CC = 10pF

HARMONIC DISTORTION

1.000
AV = 10

= 10pf

C

C

.400

RL = 8Ω

.200
.100

.040
.020

85W

.010
.004

DISTORTION, THD (%)

.002
.001

10 1K 2K 4K

1W

5W

400 20K

FREQUENCY, f (Hz)

COMMON MODE REJECTION

100

80

50

40

30

20

SLEW RATE, SR(V/µs)

10K4020 100 0

10

COMPENSATION CAPACITANCE, C

120

100

SLEW RATE

No Load

8Ω Load

20 806040

POWER SUPPLY REJECTION

+V

S

(pF)

C

(X)

QUIESCENT CURRENT

Q

2.0

1.5

= –55°C

C

T

C

T

= 25°C

1.0

= +125°C

T

C

0.5
10 30 90 150130110

NORMALIZED QUIESCENT CURRENT, I
(V)

O

10

– V

S

8

50

70

TOTAL SUPPLY VOLTAGE, VS (V)

OUTPUT VOLTAGE SWING

85°C –OUT

80

60

40

20

10 1K 10K 1M

COMMON MODE REJECTION, CMR (dB)

100 100K

FREQUENCY, f (Hz)

60

40

–V

20

0

10 100 1K 10K 100K

POWER SUPPLY REJECTION, PSR (dB)

FREQUENCY, f (Hz)

S

1M

85°C +OUT

6

25°C +OUT

4

2

02

OUTPUT CURRENT, I

VOLTAGE DROP FROM SUPPLY, V

25°C –OUT

4

(A)

O

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PA45

SUPPLY TO OUTPUT DIFFERENTIAL, VS -VO (V)

4 6 8 10 20 40 60 100 200

OUTPUT CURRENT FROM +V

S

OR –V

S

, (A)

0.1

0.2

0.4

0.6

0.8

1.0

2.0

DC, T

C

= 85°C

4.0

6.0

PULSE CURVES @ 10% DUTY CYCLE MAX

DC, T

C

= 125°C

200mS

DC

100mS

OPERATING

CONSIDERATIONS

GENERAL

Please read the General Operating Considerations section,
which covers stability, supplies, heat-sinking, mounting, cur­rent limit, SOA interpretation, and specification interpretation.
Additional information can be found in the application notes.
For information on the package outline, heatsink, and mount­ing hardware, consult the “Accessories Information” and “Pack­aging” mechanical data section of the data book.

CURRENT LIMIT

Current limiting is achieved by developing 0.83V on the
amplifiers current sense circuit by way of an internal tie to the
output drive (pin 8) and an external current sense line (pin 1).
A sense resistor R

is used to relate this sense voltage to a

CL

current flowing from output drive.

0.83 – 0.05 * I

RCL =

ICL =

0.83

R

CL

with a maximum practical value of 16Ω. R

I

CL

+ 0.05

CL

is added to the

CL

typical value of output resistance and affects the total possible
swing since it carries the load current. The swing reduction, V
can be established VR = I

OUT

* RCL.

INPUT PROTECTION

The PA45 inputs are protected against common mode
voltages up to the supply rails, differential voltages up to ±16
volts and 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 input
drive source, the protection circuitry could be destroyed. The
protection circuitry includes 300 ohm current limiting resistors
at each input. This security may be insufficient for severe
overdrive of the input. Adding external resistors to the applica­tion which limits severe input overdrive current to 1mA, will
prevent damage.

SAFE OPERATING AREA (SOA)

The MOSFET output stage of this power operational ampli-

fier has limitations from its channel temperature.

NOTE: The output is protected against transient flyback.
However, for protection against sustained, high energy flyback,
external fast-recovery diodes should be used.

SAFE OPERATING AREA

R

STABILITY

The PA45 has sufficient phase margin when compensated
for unity gain to be stable with capacitive loads of at least 10nF.
However, the low pass circuit created by the sum-point (–in)
capacitance and the feedback network may add phase shift
and cause instabilities. As a rule, the sum-point load resis­tance (input and feedback resistors in parallel) should be 1k
ohm or less. 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 sum-point resistance and sum-point capaci­tance.

The PA45 is externally compensated and performance can
be tailored to the application. The compensation network C
R

must be mounted closely to the amplifier pins 7 and 2 to

C

avoid noise coupling to these high impedance nodes.

This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.

APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: [phone]

-

C

PA45U REV. B FEBRUARY 1998 © 1998 Apex Microtechnology Corp.