Apex PA93 Datasheet

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER

MICROTECHNOLOGY

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

FEA TURES

• HIGH VOLTAGE — 400V (±200V)

• LOW QUIESCENT CURRENT — 10mA

• HIGH OUTPUT CURRENT — 8A

• PROGRAMMABLE CURRENT LIMIT

APPLICATIONS

• PIEZOELECTRIC POSITIONING

• HIGH VOLTAGE INSTRUMENTATION

• ELECTROSTATIC TRANSDUCERS

• PROGRAMMABLE POWER SUPPLIES UP TO 390V

DESCRIPTION

The PA93 is a high voltage, low quiescent current MOSFET
operational amplifier designed as a low cost solution for driving
continuous output currents up to 8A and pulse currents up to
14A. The safe operating area (SOA) has no second break­down limitations and can be observed for all type loads by
choosing an appropriate current limiting resistor. The MOSFET
output stage is biased AB for linear operation. External com­pensation provides flexibility in choosing bandwidth and slew
rate for the application. APEX’s Power SIP package uses a
minimum of board space allowing for high density circuit
boards.

PA93

TYPICAL APPLICATION

R

F

+V

S

R

IN

COMPUTER

FOCUS

COMMAND

VOLTAGE

LOW POWER, PIEZOELECTRIC POSITIONING

11,12

1

9,10

6

R

CL

PA93

2

7,8

–V

S

PIEZO DRIVE

V

OUT

EQUIVALENT SCHEMATIC

12

11

+V

–IN

+IN

–V

S

1

2

S

7
8

R1 R2 C1 R3

Q1 Q2

Q6

Q5

R5

R8 R9

Q15

R11 R12

4

CC1

CC2

R6

Piezo positioning may be applied to the focusing of seg­mented mirror systems. The composite mirror may be com­posed of hundreds of elements, each requiring focusing under
computer control. In such complex systems the PA93 reduces
the costs of power supplies and cooling with its advantages of
low cost and low quiescent power consumption while increas­ing circuit density with the SIP package.

Q3

5

Q8

Q11

Q13

Q12

3
I

Q

Q16

R4

R10

R7

Q4
ILIM

9

10

6

OUT

Q14

PHASE COMPENSATION

GAIN

≥1 220pF
≥2

≥4

≥17

*C

Never to be < 10pF. C

c

voltage +V to –Vs. Use ceramic NPO (COG) type.

Cc*R

c

100Ω

100pF

47pF
10pF

100Ω

0Ω
0Ω

To be rated for the full supply

c

EXTERNAL CONNECTIONS Package: SIP03

+V

11

12

*

s

12345678910

–IN +IN

R

I

Q

(See text.)

c

C

c

R

CL

TO LOAD

AND FEEDBACK

–V

*

s

* Bypassing required.

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PA93

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

SUPPLY VOLTAGE, +VS to –V
OUTPUT CURRENT, source, sink, peak 14A, within SOA

S

400V

POWER DISSIPATION, continuous @ TC = 25°C 125W
INPUT VOLTAGE, differential ±20V
INPUT VOLTAGE, common mode ±V
TEMPERATURE, pin solder - 10s max 220°C
TEMPERATURE, junction

2

S

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

SPECIFICATIONS

PARAMETER TEST CONDITIONS
INPUT

OFFSET VOLTAGE, initial 210mV
OFFSET VOLTAGE, vs. temperature Full temperature range 15 50 µV/°C
OFFSET VOLTAGE, vs. supply 10 25 µV/V
OFFSET VOLTAGE, vs. time 75 µV/√kh
BIAS CURRENT, initial 200 2000 pA
BIAS CURRENT, vs. supply 4 pA/V
OFFSET CURRENT, initial 50 500 pA
INPUT IMPEDANCE, DC 10
INPUT CAPACITANCE 4pF
COMMON MODE VOLTAGE RANGE

3

COMMON MODE REJECTION, DC VCM = ±90V 80 98 dB
NOISE 100KHz BW, RS = 1KΩ, CC = 10pF 1 µVrms

GAIN

OPEN LOOP, @ 15Hz RL = 2KΩ, CC = 10pF 94 111 dB
GAIN BANDWIDTH PRODUCT at 1MHz RL = 2KΩ, CC = 10pF 12 MHz
POWER BANDWIDTH RL = 2KΩ, CC = 10pF 30 kHz
PHASE MARGIN Full temperature range 60 °

OUTPUT

VOLTAGE SWING

3

IO = 8A ±VS 12 ±VS 10 V
CURRENT, continuous 8 A
SLEW RATE, AV = 100 CC = 10pF 50 V/µs
CAPACITIVE LOAD, AV = +1 Full temperature range 1 nf
SETTLING TIME to .1% CC = 10pF, 2V step 1 µs
RESISTANCE, no load 10 Ω

POWER SUPPLY

VOLTAGE

5

See note 5 ±40 ±150 ±200 V
CURRENT, quiescent, 10 14 mA

THERMAL

RESISTANCE, AC, junction to case

4

Full temperature range, F > 60Hz .7 °C/W
RESISTANCE, DC, junction to case Full temperature range, F < 60Hz 1 °C/W
RESISTANCE, junction to air Full temperature range 30 °C/W
TEMPERATURE RANGE, case Meets full range specifications –25 +85 °C

1

MIN TYP MAX UNITS

11

±

±VS 15 V

Ω

±±

NOTES: 1. Unless otherwise noted: TC = 25°C, DC input specifications are ± value given. Power supply voltage is typical rating. RC = 100

CC = 220pF.

2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation
to achieve high MTTF.

3. +VS and –VS denote the positive and negative power supply rail respectively.

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

5. Derate max supply rating .625 V/°C below 25°C case. No derating needed above 25°C case.

CAUTION

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

The PA93 is constructed from MOSFET transistors. ESD handling procedures must be observed.

TYPICAL PERFORMANCE
GRAPHS

P A93

125

POWER DERATING

100

75

50

25

INTERNAL POWER DISSIPATION

0

0 25 50 75 100 125

CASE TEMPERATURE, T (°C )

C

SMALL SIGNAL RESPONSE

50

40

30

20

10

0

OPEN LOOP GAIN, A (dB)

–10

100K

Cc = 220 pF
Cc = 100 pF

Cc = 47 pF
Cc = 10 pF

1M 10M

FREQUENCY, F (Hz)

SLEW RATE

60
40

30
20

µ

10

8
6

4
3

SLEW RATE, (V/ S)

2
1

10 60

EXT. COMPENSATION CAPACITOR, C (pF)

30

100 200 30020 40

CURRENT LIMIT

8

C

PHASE RESPONSE

90

135

Φ

180

Cc = 220 pF
Cc = 100 pF

PHASE, (°)

Cc = 47 pF

225

Cc = 10 pF

270

100k

OUTPUT VOLTAGE SWING

9

SO

8

1M 10M

FREQUENCY F (Hz)

Q

1.8

1.6

1.4

1.2

1.0

NORMALIZED QUIESCENT CURRENT, I (X)

400

PP

O

100

7

6

OUTPUT VOLTAGE, V (V )

5

068

2

OUTPUT CURRENT, I (A)

VOLTAGE DROP FROM SUPPLY, V – V (V)

HARMONIC DISTORTION

.1

Po = 1W
Po = 20W
Po = 62W

4

O

20
15

N

10

.01

DISTORTION, (%)

.001

100 1K

10K

INPUT NOISE VOLTAGE, V (nV Hz)

FREQUENCY, F (Hz)

NORMALIZED QUIES. CURRENT

0 50 100

CASE TEMPERATURE, Tc (°C)

75

POWER RESPONSE

C = 10pF

C

C = 47pF

C

C = 100pF

C

C = 220pF

C

10

1K 10K

FREQUENCY, F (Hz)

100K

INPUT NOISE VOLTAGE

7
5

3

2

10 100 10K 100K

1K

FREQUENCY, F (Hz)

125

1M

6

LIM

4

2

CURRENT LIMIT, I (A)

0

0.2.3.5.6

.1 .4

RESISTOR VALUE, R (Ω)

CL

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PA93

OPERATING

CONSIDERATIONS

GENERAL

Please read the “General Operating Considerations” sec­tion, which covers stability, supplies, heatsinking, mounting,
current limit, SOA interpretation, and specification interpreta­tion. Additional information can be found in the application
notes. For information on the package outline, heatsinks, and
mounting hardware, consult the “Accessory and Package
Mechanical Data” section of the handbook.

CURRENT LIMIT

For proper operation, the current limit resistor (RCL) must be
connected as shown in the external connection diagram. For
optimum reliability the resistor value should be set as high as
possible. The value is calculated as follows; with the maximum
practical value of 16 ohms.

R

CL

.65

=

I

LIM

SAFE OPERATING AREA (SOA)

The MOSFET output stage of this power operational ampli­fier has two distinct limitations:

1. The current handling capability of the MOSFET geometry

and the wire bonds.

2. The junction temperature of the output MOSFETs.
NOTE: The output stage is protected against transient flyback.

However, for protection against sustained, high energy flyback,
external fast-recovery diodes should be used.

SAFE OPERATING CURVES

The safe operating area curves define the maximum addi­tional internal power dissipation the amplifier can tolerate
when it produces the necessary output to drive an external
load.

20

10

, (A)

OR –V

OUTPUT CURRENT FROM +V

8

S

6
4

S

3
2

1

.8
.6

.4
.3

.2

.1
.08
.06

10 20 30 40 100 200 300 500

DC, TC = 25°C

DC,T

200mS

DC,T

C

= 125°C

60 80

C

= 85°C

100mS

INPUT PROTECTION

Although the PA93 can withstand differential voltages up to
±20V, additional external protection is recommended. Low
leakage, low capacitance JFETs connected as diodes are
recommended (e.g. 2N4416, Q1-Q4 in Figure 2). The differen­tial input voltage will be clamped to ±1.4V. This is sufficient
overdrive to produce maximum power bandwidth.

POWER SUPPLY PROTECTION

Unidirectional zener diode transient suppressors are recom­mended as protection on the supply pins. See Figure 2. The
zeners clamp transients to voltages within the power supply
rating and also clamp power supply reversals to ground.
Whether the zeners are used or not, the system power supply
should be evaluated for transient performance including power­on overshoot and power-off polarity reversals as well as line
regulation.

Conditions which can cause open circuits or polarity rever­sals on either power supply rail should be avoided or protected
against. Reversals or opens on the negative supply rail is
known to induce input stage failure. Unidirectional transzorbs
prevent this, and it is desirable that they be both electrically and
physically as close to the amplifier as possible.

STABILITY

The PA93 is externally compensated and performance can
be tailored to the application. Use the graphs of small signal
response and power response as a guide. The compensation
capacitor C
capacitor is recommended. The compensation network C

must be rated at 500V working voltage. An NPO

C

CRC

must be mounted closely to the amplifier pins 4 and 5 to avoid
spurious oscillation.

QUIESCENT CURRENT REDUCTION

When pin 3 (IQ) is shorted to pin 5 (CC2) the AB biasing of
the output stage is disabled. This lowers quiescent power but
also raises distortion since the output stage is then class C
biased. The output stage bias current is nominally set at 1mA.
Pin 3 may be left open if not used.

+V

S

Z1

1

–IN

Q1

Q2

+IN

FIGURE 2.

OVERVOLTAGE

PROTECTION

Q3

Q4

11, 12

PA93

7, 8

2

–V

S

6

Z2

SUPPLY TO OUTPUT DIFFERENTIAL, VS – VO (V)

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.

PA93U REV. B MARCH 1999 © 1999 Apex Microtechnology Corp.