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1
FEATURES
HIGH INTERNAL DISSIPATION -- 400 Watts
HIGH CURRENT -- 40A Continuous, 100A PEAK
HIGH SLEW RATE -- 50V/s
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 ef-
ficient operation.
EQUIVALENT SCHEMATIC
The JEDEC MO-127 12-pin Power DipTM 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
12-PIN DIP
PACKAGE STYLE CR
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
2
PA50
PA50A
PARAMETER
TEST CONDITIONS
1
MIN
TYP
MAX
MIN
TYP
MAX UNITS
INPUT
OFFSET VOLTAGE, initial
5
10
2
5
mV
OFFSET VOLTAGE, vs. temperature
Full temperature range
20
50
*
*
V/V
OFFSET VOLTAGE, vs. supply
10
30
*
*
V/V
BIAS CURRENT, initial
10
50
*
*
pA
BIAS CURRENT vs. supply
.01
*
pA/V
OFFSET CURRENT, initial
10
50
*
*
pA
INPUT IMPEDANCE, DC
10"
*
IMPUT CAPACITANCE
13
*
pF
COMMON MODE VOLTAGE RANGE Full temperature range
-V
B
+12
+V
B
-14
*
V
COMMON MODE REJECTION,DC
Full temp, range, V
CM
= 20V
90
100
*
*
dB
INPUT NOISE
100KHZ BW, Rs=1K
10
*
Vrms
GAIN
OPEN LOOP,@ 15Hz
Full temperature range
94
102
*
*
dB
GAIN BANDWIDTH PRODUCT
R
L
=10
3
*
MHz
POWER BANDWIDTH
R
L
=4, V
o
=80V
P-P
, Av=-10
200
*
kHz
Full temperature range
OUTPUT
VOLTAGE SWING
I
o
=40A
V
S
9.5 V
S
8.0
*
*
V
VOLTAGE SWING, PA50
V
BOOST
=V
S
10V, I
o
=40A
V
S
5.8 V
S
4.0
V
VOLTAGE SWING, PA50A
V
BOOST
=V
S
10V, I
o
=50A
V
S
5.8 V
S
5.0
V
CURRENT, peak
3ms 10% Duty Cycle
100
*
A
SETTLING TIME TO.1%
A
V
= -10,10V STEP,R
L
=4
1
*
s
SLEW RATE
A
V
=-10
50
*
V/s
RESISTANCE
I
O
=0, NO LOAD, 2MHZ
2.5
*
POWER SUPPLY
VOLTAGE, V
BOOST
Full temperature range
+14, -12
15
65
*
*
*
V
VOLTAGE, V
S
Full temperature range
3
50
*
*
V
CURRENT,quiescent, boost supply
26
32
*
*
mA
CURRENT, quiescent, total
30
36
*
*
mA
THERMAL
RESISTANCE,AC,junction to case
3
Full 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
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +V
S
to V
S
100V
BOOST VOLTAGE, +V
b
to -V
b
130V
OUTPUT CURRENT, within SOA
100A
POWER DISSIPATION, internal
400W
INPUT VOLTAGE, differential
20V
INPUT VOLTAGE, common mode
V
b
TEMPERATURE, pin solder - 10s
300C
TEMPERATURE, junction
2
150C
TEMPERATURE, storage
65 to +150C
OPERATING TEMPERATURE RANGE, case
55 to +125C
PA50 PA50A
SPECIFICATIONS
NOTES: * The specification of PA50A is identical to the specification for PA50 in applicable column to the left
1. Unless otherwise noted: T
C
= 25C, DC input specifications are value given. Power supply voltage is typical rating.
V
BOOST
= V
S
.
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.
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 850C to avoid generating toxic fumes.
CAUTION
APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
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TYPICAL PERFORMANCE
GRAPHS
PA50 PA50A
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
4
OPERATING
CONSIDERATIONS
PA50 PA50A
GENERAL
Please read Application Note 1 "General Operating Con-
siderations" 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 imple-
mented if needed. See EK27 data sheet for more details.
BOOST OPERATION
With the V
BOOST
feature the small signal stages of the
amplifier are operated at higher supply voltages than the
amplifier's high current output stage. +V
BOOST
(pin 11) and
V
BOOST
(pin 12) are connected to the small signal circuitry of
the amplifier. +V
S
(pin 9,10) and V
S
(pin 3,4) are connected to
the high current output stage. An additional 10V on the V
BOOST
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
BOOST
and +V
S
pins must be strapped together as well as the V
BOOST
and V
S
pins. The boost voltage pins must not be at a voltage lower
than the V
S
pins.
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.
PA50U REV D JANUARY 2005 2005 Apex Microtechnology Corp.
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 .1F ceramic capacitors directly at the
supply pins. On the +Vs and -Vs pins use a combination of
ceramic and electrolytic capacitors. Use 1F ceramic capaci-
tors and an electrolytic capacitor at least 10F for each amp
of output current required.
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