POWER OPERATIONAL AMPLIFIER
PA17
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
• HIGH INTERNAL DISSIPATION — 850 WATTS
• HIGH VOLTAGE, HIGH CURRENT — 200V
50A CONTINUOUS, 100A PULSE
• HIGH SLEW RATE — 50V/µS
• 4 WIRE CURRENT LIMIT SENSING
• EXTERNAL SHUT DOWN CONTROL
• OPTIONAL BOOST VOLTAGE INPUTS
PRELIMINARY
APPLICATIONS
•
•
•
•
SEMI CONDUCTOR TESTING
SONAR TRANSDUCER DRIVER
LINEAR AND ROTARY MOTOR DRIVES
YOKE/MAGNETIC FIELD EXCITATION
EXTERNAL CONNECTIONS
Rc Cc
DESCRIPTION
The PA17 is a high voltage MOSFET power operational
amplifier that extends the performance limits of power ampli-
fiers in slew rate and power bandwidth, while maintaining high
current and power dissipation ratings.
The PA17 is a highly flexible amplifier. The shutdown
feature allows ultra-low quiescent current for standby opera-
tion or load protection by disabling the entire amplifier. 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.
External compensation tailors performance to user needs. A
four wire sense technique allows current limiting without the
need to consider internal or external milliohm parasitic resis-
tance in the output line.
1
+5V
*
5
6
+Vb
*
7
GND
*
LOAD
Rcl**
+OUT
+OUT
+OUT
2
IS2
3
IS1
4
CC1
8
9
10
11
+Vs
– Vs
12
+Vs
– Vs
SHT DN
STATUS
RESET
CC2
– OUT
– OUT
24 23
22
21
20
*
19
18
17
16 15
– OUT
-Vb2
-Vb1
+IN
-IN
14
13
*
*
PHASE COMPENSATION
GAIN
Rc
1
100
>3
SHORT
>10
SHORT
100
SHORT
Cc
470pF
220pF
100pF
10pF
PIN SIDE VIEW
* BYPASSING OF SUPPLIES IS REQUIRED
** SEE TEXT FOR OTHER CURRENT
LIMIT CONNECTIONS
EQUIVALENT SCHEMATIC
APEX MICROTECHNOLOGY CORPORATION
• TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
PA17
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +V
S
to –V
S
BOOST VOLTAGE
OUTPUT CURRENT, within SOA
POWER DISSIPATION, internal
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder - 10s
TEMPERATURE, junction
2
TEMPERATURE, storage
OPERATING TEMPERATURE RANGE, case
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
200V
±V
S
±20V
100A
850W
±20V
±V
B
300°C
150°C
–65 to +150°C
–25 to +85°C
SPECIFICATIONS
PARAMETER
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
OFFSET VOLTAGE, vs. supply
BIAS CURRENT, initial
BIAS CURRENT, vs. supply
OFFSET CURRENT, initial
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE
COMMON MODE REJECTION, DC
INPUT NOISE
GAIN
OPEN LOOP, @ 15Hz
GAIN BANDWIDTH PRODUCT
POWER BANDWIDTH
PHASE MARGIN
OUTPUT
VOLTAGE SWING
5
VOLTAGE SWING
5
CURRENT, peak
5
SETTLING TIME to .1%
SLEW RATE
CAPACITIVE LOAD
POWER SUPPLY
VOLTAGE
CURRENT, quiescent, boost supply
CURRENT, quiescent, total
CURRENT, quiescent, total, shutdown
THERMAL
RESISTANCE, AC, junction to case
3
RESISTANCE, DC, junction to case
RESISTANCE
4
, junction to air
TEMPERATURE RANGE, case
Full temperature range, F>60Hz
Full temperature range, F<60Hz
Full temperature range
Meets full range specification
.1
.15
10
–25
85
°C/W
°C/W
°C/W
°C
Full temperature range
Full temperature range
±15
±75
±100
30
120
22
V
mA
mA
mA
I
O
= 50A
±V
B
=±Vs
±
10V, I
O
= 50A
C
c
= 100pF
A
V
= +1
±V
S
8.8
±V
S
6.8
100
40
10
±V
S
7.5
±V
S
5.5
2.5
50
Full temperature range, C
C
= 100pF
I
O
= 10A
R
L
= 4.5Ω, V
O
= 180V p-p
Full temperature range
94
102
2
90
60
dB
MHz
kHz
°
Full temperature range
5
30
15
10
.01
10
10
11
4
98
10
10
50
50
50
mV
µV/°C
µV/V
pA
pA/V
pA
Ω
pF
V
dB
µVrms
TEST CONDITIONS
1
MIN
TYP
MAX
UNITS
Full temperature range
Full temp. range, V
CM
=
±20V
100kHz BW, R
S
= 1KΩ
±V
B
10
86
NOTES 1.
2.
3.
4.
5.
Unless otherwise noted: T
C
= 25°C. DC input specifications are
±
value given. Power supply voltage is typical rating.
±VB= ±V
S
, Cc = 470pF, Rc=100Ω.
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.
Rating applies if the output current alternates between both output transistors at a rate faster than 60 Hz.
The PA17 must be used with a heatsink or the quiescent power may drive the unit to junction temperatures higher than 150°C.
Parameter guaranteed but not tested.
The PA17 is constructed from MOSFET transistors. ESD handling procedures must be observed.
CAUTION
APEX MICROTECHNOLOGY CORPORATION
• 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
±
±
±
±
±
V
V
A
µs
V/µs
nF
OPERATING CONSIDERATIONS
PA17
In addition, the current limit of the PA17 operates differently
than other Apex linear power amplifiers in that the output
current is not clamped at the current limit set point. Instead,
when an over-current condition is detected the PA17 sets
STATUS (pin 23) high. This flag can alert external circuitry to
do a variety of things to deal with this fault condition. For
example, when STATUS is connected directly to SD (pin 22)
the output stage of the PA17 is disabled until RESET (pin 24)
is toggled high (Figure 1). Another possibility would be to
connect STATUS to the SD pin via a RC circuit to delay the
shutdown of the output stage (Figure 2). This technique would
be useful if a short-term overload is normally expected that
does not exceed the safe operating area of the PA17. In still
another variation STATUS could trigger an external timer that
would periodically reset the PA17 until the fault is cleared.
GENERAL
Please read Application Note 1 "General Operating Consid-
erations" which covers stability, supplies, heat sinking, mount-
ing, current limit, SOA interpretation, and specification inter-
pretation. 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 Work-
book; and Evaluation Kits.
CURRENT LIMIT
The positive and negative outputs of the PA17 must be
connected together by the user. However, the fact that multiple
pins share the output current allows for some unusual current
limit schemes not found in amplifiers with a single output pin.
Three pins each in the positive and negative outputs share
the output current of the PA17. Pins 8 and 10 of the positive
output and pins 15 and 17 of the negative output each carry
approximately 25% of the output current. Pin 9 of the positive
output and pin 16 of the negative output carry the remaining
50% of the output current .
For the current limit to operate correctly pin 3 (IS1) must be
connected to the amplifier output side and pin 2 (IS2) con-
nected to the load side of the current limit resistor Rcl, as
shown in Figure 1. But Rcl may be connected to sample only
a fraction of the output current. With this method the current
limit resistor consumes less power and only slightly lowers the
overall accuracy of the current limit set point. Figure 1, shows
a circuit that samples only 25% of the output current. Only
those pins necessary to illustrate the current limit function are
shown in Figure 1.
STATUS, SHUTDOWN AND RESET FUNCTIONS
The 5V logic section of the PA17 provides control and
monitoring functions. The PA17 is protected from thermal
overloads by directly measuring the temperature of the output
transistors. When a thermal overload is detected the output
stage is latched off and the STATUS output goes high, indicat-
ing an alarm condition. A high on the RESET pin resets the
output stage. A high on the SHUTDOWN pin will also latch the
output stage off and forces the STATUS pin high. The SHUT-
DOWN pin can be used to put the PA17 in a standby mode to
lower the quiescent current and standby power dissipation. A
thermal overload immediately latches off the output stage and
cannot be delayed by external circuitry.
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 6) and
–V
BOOST
(pins 18, 19) are connected to the small signal circuitry
of the amplifier. +V
S
(pins 11,12) and –V
S
(pins 13, 14) 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 re-
quired. 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.
FIGURE 1.
COMPENSATION
The external compensation components C
C
and R
C
are
connected to pins 4 and 5. Unity gain stability can be achieved
at any compensation capacitance greater than 330 pF with at
least 60 degrees of phase margin. At higher gains more phase
shift can be tolerated in most designs and the compensation
capacitance can accordingly be reduced, resulting in higher
bandwidth and slew rate. Use the typical operating curves as
a guide to select C
C
and R
C
for the application.
FIGURE 2.
APEX MICROTECHNOLOGY CORPORATION
• TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
PA17U REV 3 JUNE 2000 © 2000 Apex Microtechnology Corp.
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