Apex PA50, PA50A Datasheet

MICROTECHNOLOGY

FEATURES

POWER OPERATIONAL AMPLIFIERS

PA50 • PA50A

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

• HIGH INTERNAL DISSIPATION — 400 Watts

• HIGH CURRENT — 40A Continuous, 100A PEAK

• HIGH SLEW RATE — 50V/µs

• OPTIONAL BOOST VOLTAGE INPUTS

APPLICATIONS

• SEMI-CONDUCTOR TESTING

DESCRIPTION

The PA50 is a MOSFET power operational amplifier that
extends the performance limits of power amplifiers in slew rate
and power bandwidth, while maintaining high current and
power dissipation ratings.

Boost voltage inputs allow the small signal portion of the
amplifier to operate at a higher voltage than the high current
output stage. The amplifier is then biased to achieve close
linear swings to the supply rails at high currents for extra
efficient operation.

EQUIVALENT SCHEMATIC

PA

50A

∆

U

S

ABe

T

O

E

9

4

9

3

1

1

The JEDEC MO-127 12-pin Power Dip™ package (see
Package Outlines) is hermetically sealed and isolated from the
internal circuits. The use of compressible thermal washers
and/or improper mounting torque will void the product war­ranty. Please see “General Operating Considerations”.

EXTERNAL CONNECTIONS

-V

–IN
+IN

-V

-V

-OUT

-OUT

1
2

s
s

3

TOP

TOP

VIEW

VIEW

4
5
6

12
11
10

9
8
7

b

b

+V
+V

s

+V

s

+OUT
+OUT

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P A50 • P A50A

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

SUPPLY VOLTAGE, +VS to –V
BOOST VOLTAGE, +Vb to -V
OUTPUT CURRENT, within SOA 100A

S

b

100V
130V

POWER DISSIPATION, internal 400W
INPUT VOLTAGE, differential ±20V
INPUT VOLTAGE, common mode ±V
TEMPERATURE, pin solder - 10s 300°C
TEMPERATURE, junction

2

b

175°C
TEMPERATURE, storage –65 to +150°C
OPERATING TEMPERATURE RANGE, case –55 to +125°C

SPECIFICATIONS

PARAMETER TEST CONDITIONS

1

MIN TYP MAX MIN TYP MAX UNITS

PA50APA50

INPUT

OFFSET VOLTAGE, initial 5 10 2 5 mV
OFFSET VOLTAGE, vs. temperature Full temperature range 20 50 * * µV/°V
OFFSET VOLTAGE, vs. supply 10 30 * * µV/V
BIAS CURRENT, initial 10 50 * * pA
BIAS CURRENT vs. supply .01 * pA/V
OFFSET CURRENT, initial 10 50 * * pA
INPUT IMPEDANCE, DC 10" * Ω
IMPUT CAPACITANCE 13 * pF
COMMON MODE VOLTAGE RANGE Full temperature range ±Vb 12 * V

±

COMMON MODE REJECTION,DC Full temp, range, VCM= ±20V 90 100 * * dB
INPUT NOISE 100KHZ BW, Rs=1KΩ 10 * µVrms

GAIN

OPEN LOOP,@ 15Hz Full temperature range 94 102 * * dB
GAIN BANDWIDTH PRODUCT RL=10Ω 3 * MHz
POWER BANDWIDTH RL=4Ω, Vo=80V

Full temperature range

, Av=-10 400 * kHz

P-P

OUTPUT

VOLTAGE SWING Io=40A ±VS 9.5 ±VS 8.7 * * V
VOLTAGE SWING, PA50 ±V
VOLTAGE SWING, PA50A ±V
CURRENT, peak 3ms 10% Duty Cycle 100 * A

=±VS±10V, Io=40A ±VS 5.8 ±VS 5.0 V

BOOST

=±VS±10V, Io=50A ±VS 5.8 ±VS 5.0 V

BOOST

±

±

±
±

± ±

SETTLING TIME TO.1% AV= -10,10V STEP,RL=4Ω 1*µs
SLEW RATE AV=-10 50 * V/µs
RESISTANCE IO=0, NO LOAD, 2MHZ 2.5 * Ω

POWER SUPPLY

VOLTAGE, ±V
VOLTAGE, ±V
CURRENT,quiescent, boost supply 26 32 * * mA

BOOST
S

Full temperature range ±12 ±15 ±65 * * * V
Full temperature range ±3 ±50 * * V

CURRENT, quiescent, total 30 36 * * mA

THERMAL

RESISTANCE,AC,junction to case3Full temperature range, F>60HZ .2 .25 * * °C/W
RESISTANCE,DC,junction to case Full temperature range, F>60HZ .25 .31 * * °C/W
RESISTANCE, junction to air Full temperature range 12 * °C/W
TEMPERATURE RANGE, case Meets full range specification -25 85 * * °C

NOTES: * The specification of PA50A is identical to the specification for PA50 in applicable column to the left

1. Unless otherwise noted: TC = 25°C, DC input specifications are ± value given. Power supply voltage is typical rating.
±V

= ±VS.

BOOST

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 the heatsink data sheet.

3. Rating applies if the output current alternates between both output transistors at a rate faster than 60 Hz.

CAUTION

The PA50 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.

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

TYPICAL PERFORMANCE
GRAPHS

P A50 • PA50A

500

POWER DERATING

400

T = T

300

C

200

100

0

0 25 50 75 100

INTERNAL POWER DISSIPATION, P(W)

120

TEMPERATURE, T (°C)

SMALL SIGNAL GAIN

80

40

0

RL = 4Ω

OPEN LOOP GAIN RESPONSE, A(dB)

1 100 1K 10K 100K 1M

10 10M

FREQUENCY,Ff (Hz)

POWER SUPPLY REJECTION

100

80

60

40

20

0

100 1K 10M

10

POWER SUPPLY REJECTION, PSR (dB)

SMALL SIGNAL PHASE

0

10K 100K 1M

FREQUENCY F (Hz)

RL = 4Ω

–45

–90

–135

OPEN LOOP PHASE, (°)Φ

–180

100 10M1 10 1K 10K 100K 1M

FREQUENCY, F (Hz)

OUTPUT VOLTAGE SWING

(V)

O

10

–V

S

8

S

T

6

S

O

O

V = V

B

4

+ 10V

2

0

010 304050

OUTPUT CURRENT, I (A)

VOLTAGE DROP FROM SUPPLY, V

100

)

PP

O

POWER RESPONSE

90
80
70

60

V = V

20

S

ST

O

O

B

O

50
40

30

OUTPUT VOLTAGE, V (V

20

100K

FREQUENCY, F (Hz)

1M

COMMON MODE REJECTION

100

80

60

40

20

0

10

COMMON MODE REJECTION, CMR (dB)

FREQUENCY, F (Hz)

1M100 1K 10K 100K

Q

1.125

QUIESCENT CURRENT

±VS = ±V

B

1.1

1.075

1.05

1.025

1

20 100

40 60 80

TOTAL SUPPLY VOLTAGE, V (V)

NORMALIZED QUIESCENT CURRENT, I (X)

S

SAFE OPERATING AREA

100

10

DC Tc = 125

t = 1m

t = 10ms

DC Tc = 25

DC Tc = 85

°C

s

°C

°C

1

OUTPUT CURRENT, (A)

0.1
10

SUPPLY TO OUTPUT DIFFERENTIAL, (V)

1001

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PA50 • P A50A

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.apexmicrotech.com for design tools that
help automate tasks such as calculations for stability, internal
power dissipation, current limit; heat sink selection; Apex’s
complete Application Notes library; Technical Seminar Work­book; and Evaluation Kits.

CURRENT LIMIT

There is no internal circuit provision for current limit in the
PA50. However, the PA50 circuit board in the PA50 evaluation
kit does provide a means whereby the output current can be
sensed. An external circuit current limit can thereby be imple­mented if needed. See EK27 data sheet for more details.

BOOST OPERATION

With the V
amplifier are operated at higher supply voltages than the
amplifier’s high current output stage. +V
–V

(pin 12) are connected to the small signal circuitry of

BOOST

the amplifier. +V
the high current output stage. An additional 10V on the V
pins is sufficient to allow the small signal stages to drive the
output transistors into saturation and improve the output
voltage swing for extra efficient operation when required.
When close swings to the supply rails is not required the
+V

and +VS pins must be strapped together as well as the

BOOST

–V

and –VS pins. The boost voltage pins must not be at a

BOOST

voltage lower than the V

feature the small signal stages of the

BOOST

(pin 11) and

BOOST

(pin 9,10) and –VS (pin 3,4) are connected to

S

pins.

S

BOOST

OPERATING

CONSIDERATIONS

COMPENSATION

Compensation is internally fixed for a gain of 3 or more and
is not adjustable by the user. The PA50 therefore is not unity
gain stable.

POWER SUPPLY BYPASSING

Proper and sufficient power supply bypassing is crucial to
proper operation of the PA50. Bypass the +Vb and -Vb supply
pins with a minimum .1µF ceramic capacitors directly at the
supply pins. On the +Vs and -Vs pins use a combination of
ceramic and electrolytic capacitors. Use 1µF ceramic capaci­tors and an electrolytic capacitor at least 10µF for each amp of
output current required.

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]

PA50U REV A JANUARY 2001 © 2001 Apex Microtechnology Corp.