DUAL POWER OPERATIONAL AMPLIFIERS
PA35
M I C R O T E C H N O L O G Y
HTTP://WWW.APEXMICROTECH.COM
(800) 546-APEX
(800) 546-2739
FEATURES
• LOW COST
• WIDE COMMON MODE RANGE —
Includes negative supply
• WIDE SUPPLY VOLTAGE RANGE
Single supply: 5V to 40V
Split supplies: ±2.5V to ±20V
• HIGH EFFICIENCY — |Vs–1.4V| at 1.0A typ
• HIGH OUTPUT CURRENT — 1.7A min
• INTERNAL CURRENT LIMIT
• LOW DISTORTION
APPLICATIONS
• HALF & FULL BRIDGE MOTOR DRIVERS
• AUDIO POWER AMPLIFIER
• IDEAL FOR SINGLE SUPPLY SYSTEMS
5V — Peripherals
12V — Automotive
28V — Avionic
EXTERNAL CONNECTIONS
PA35
DESCRIPTION
The PA35 consists of a monolithic power op amp with a
unity gain buffer in a 7-pin TO220 package. The 7-pin TO220
flat back heat tab allows for heat sinking with an electrically
insulating thermal washer. The tab of the 7-pin TO220 plastic
package is tied to -V
s
.
Combining the power amp and the unity gain buffer in
a parallel connection yields a single 3.4A amplifier. The
wide common mode input range includes the negative
rail, facilitating single supply applications. It is possible
to have a "ground based" input driving a single supply
amplifier with ground acting as the "second" or "bottom"
supply of the amplifier.
The Safe Operating Area (SOA) must be observed when
determining the effect of all limits for the PA35 power op
amp. Proper heat sinking is required for maximum reliability
and performance.
A
-
+
+
B
-
1
2
3
4
5
6
7
+VS
+V
S
OUT AMP A
EQUIVALENT SCHEMATIC
TYPICAL CIRCUIT
RI
RF
+V
S
1/2
PA35
A
1Ω
V
IN
.1µF
LOAD
1/2
PA35
B
1Ω
–V
S
.1µF
R
S
.2Ω
I
– IN
+IN
OUT
PARALLEL CONNECTION
yields a single 3.4A amplifier
V
O
2I
R
S
.2Ω
I
SUB
– V
S
CHANNEL A
CHANNEL B
NOTE: INTERNAL BONDING REPRESENTED BY DASHED LINE
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
OUT AMP B
+IN AMP A
-IN AMP A
IN AMP B
-VS
PA35
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, total
OUTPUT CURRENT
POWER DISSIPATION, internal, (per amplifier)
POWER DISSIPATION, internal (both amplifiers)
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
JUNCTION TEMPERATURE, max
1
TEMPERATURE, pin solder—10 sec max
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE RANGE, case
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
5V to 40V
1.7A
18.5W
27.5W
±V
S
+V
S
, -V
S
–.5V
150°C
300°C
–65°C to 150°C
–55°C to 125°C
SPECIFICATIONS
PARAMETER
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
BIAS CURRENT, initial
COMMON MODE RANGE
COMMON MODE REJECTION, DC
POWER SUPPLY REJECTION
GAIN
OPEN LOOP GAIN
GAIN BANDWIDTH PRODUCT
PHASE MARGIN
POWER BANDWIDTH
OUTPUT
CURRENT, peak
SLEW RATE
CAPACITIVE LOAD DRIVE
VOLTAGE SWING
POWER SUPPLY
VOLTAGE, V
SS3
CURRENT, quiescent, total
THERMAL
RESISTANCE,
DC junction to case (single)
RESISTANCE,
AC junction to case (single)
RESISTANCE,
DC junction to case (both)
RESISTANCE,
AC junction to case (both)
RESISTANCE,
junction to air
TEMPERATURE RANGE,
case
Meets full range specifications
5.44
4.07
3.64
2.73
–25
5
4
1.7
.5
A
V
= 1
Full temp. range, I
O
= 100mA
|V
S
| –1.0
Full temperature range
A
V
= 40dB
Full temperature range
V
O(P-P)
= 28V
80
Full temperature range
Full temperature range
Full temperature range
Full temperature range
35
–V
S
–.3
60
60
TEST CONDITIONS
2
MIN
PA35
TYP
MAX
UNITS
1.5
15
1000
85
80
10
nA
+V
S
–2
mV
µV/°C
dB
dB
dB
100
600
65
13.6
dB
kHz
°
kHz
1.2
.22
|V
S
| –0.8
A
V/µs
µF
V
30
45
40
90
V
mA
6.80
5.10
4.55
3.41
60
85
°C/W
°C/W
°C/W
°C
NOTES:
1.
2.
3.
4.
Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation
to achieve high MTTF.
Unless otherwise noted, the following conditions apply: ±V
S
= ±15V, T
C
= 25°C.
+V
S
and –V
S
denote the positive and negative supply rail respectively. V
SS
denotes the total rail-to-rail supply voltage.
Current limit may not function properly below V
SS
= 6V, however SOA violations are unlikely in this area.
APEX MICROTECHNOLOGY CORPORATION
• 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
PA35
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 and heat sink
selection. The "Application Notes" and "Technical Seminar"
sections contain a wealth of information on specific types of
applications. Package outlines, heat sinks, mounting hardware
and other accessories are located in the "Packages and
Accessories" section. Evaluation Kits are available for most
Apex product models, consult the "Evaluation Kit" section for
details. For the most current version of all Apex product data
sheets, visit www.apexmicrotech.com.
OPERATING
CONSIDERATIONS
allowing the output voltage to drop more than 6V below the
supply rail while the amplifier is current limiting, the inductor
should be capacitively coupled or the supply voltage must be
lowered to meet SOA criteria.
NOTE: For protection against sustained, high energy flyback,
external fast-recovery diodes should be used.
MONOLITHIC AMPLIFIER
STABILITY CONSIDERATIONS
All monolithic power op amps use output stage topologies
that present special stability problems. This is primarily due
to non-complementary (both devices are NPN) output
stages with a mismatch in gain and phase response for
different polarities of output current. It is difficult for the
op amp manufacturer to optimize compensation for all
operating conditions.
The recommended R-C network of 1 ohm in series with
0.1µF from output to AC common (ground or a supply rail,
with adequate bypass capacitors) will prevent local output
stage oscillations.
The amplifiers are internally compensated for unity gain
stability, no additional compensation is required.
CURRENT LIMIT
Current limit is internal to the amplifier, the typical value is
shown in the current limit specification.
OUTPUT CURRENT FROM +V OR –V (A)
S
S
5
4
3
2
1
THERMAL CONSIDERATIONS
DC
,T
C
=2
5
°
C
DC
,T
C
=8
5
°
C
The PA35 may require a thermal washer which is electrically
insulating since the tab is tied to –V
S
. This can result in thermal
impedances for R
θCS
of up to 1°C/W or greater.
V
BIAS
should be set midway between +V
s
and -V
s
, Vref
is usually ground in dual supply systems or used for level
translation in single supply systems.
MOUNTING PRECAUTIONS
.1
1
2
3
4 5 6 7 8 9 10
20
30 40
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE V
S
–V
O
(V)
SAFE OPERATING AREA (SOA)
The SOA curves combine the effect of all limits for this
power op amp. For a given application, the direction and
magnitude of the output current should be calculated or
measured and checked against the SOA curves. This is
simple for resistive loads but more complex for reactive and
EMF generating loads. The following guidelines may save
extensive analytical efforts.
Under transient conditions, capacitive and dynamic*
inductive loads up to the following maximum are safe:
±Vs
20V
15V
10V
5V
CAPACITIVE LOAD
200µF
500µF
5mF
50mF
INDUCTIVE LOAD
7.5mH
25mH
35mH
150mH
1. Always use a heat sink. Even unloaded, the PA35 can
dissipate up to 3.6 watts. An insulating thermal washer
should always be used.
2. Avoid bending the leads. Such action can lead to internal
damage.
3. Always fasten the tab to the heat sink before the leads are
soldered to fixed terminals.
4. Strain relief must be provided if there is any probability of
axial stress to the leads.
* If the inductive load is driven near steady state conditions,
This
MICROTECHNOLOGY CORPORATION
•
to be
NORTH SHANNON ROAD
assumed for possible inaccuracies
• USA •
All specifications
HOTLINE: 1 (800) 546-2739
APEX
data sheet has been carefully checked and is believed
5980
reliable, however, no responsibility
•
is
TUCSON, ARIZONA 85741
or omissions.
APPLICATIONS
are subject to change without notice.
PA35U REV. A MARCH 2001 © 2001 Apex Microtechnology Corp.
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