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

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