Apex PA90 Datasheet

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER

MICROTECHNOLOGY

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

FEATURES

• HIGH VOLTAGE — 400V (±200V)

• LOW QUIESCENT CURRENT — 10mA

• HIGH OUTPUT CURRENT — 200mA

• PROGRAMMABLE CURRENT LIMIT

• HIGH SLEW RATE — 300V/µs

APPLICATIONS

• PIEZOELECTRIC POSITIONING

• HIGH VOLTAGE INSTRUMENTATION

• ELECTROSTATIC TRANSDUCERS

• PROGRAMMABLE POWER SUPPLIES UP TO 390V

DESCRIPTION

The PA90 is a high voltage, low quiescent current MOSFET
operational amplifier designed as a low cost solution for driving
continuous output currents up to 200mA and pulse currents up
to 350mA. 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.

EQUIVALENT SCHEMATIC

12
11

+V

S

R1 R2 C1 R3

PA90

TYPICAL APPLICATION

R

F

+V

S

R

IN

COMPUTER

FOCUS

COMMAND

VOLTAGE

LOW POWER, PIEZOELECTRIC POSITIONING

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 PA90 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.

11,12

1

PA90

2

9,10

R

–V

7,8

S

6

CL

PIEZO DRIVE

V

OUT

Q1 Q2

Q6

Q5

1

R5

–IN

R8 R9

2

+IN

Q15

–V

S

7
8

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R11 R12

4

CC1

5

CC2

R6

Q3

Q8

Q11

Q13

Q12

3
I

Q

Q16

R4

R10

R7

Q4
ILIM

10

OUT

Q14

PHASE COMPENSATION

GAIN

≥1 68pF

9

*C

6

c

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

≥5
≥10
≥30

To be rated for the full supply voltage

EXTERNAL CONNECTIONS

12345678910

–IN +IN

I

Q

(See text.)

R

c

10pF

4.7pF

NONE

AND FEEDBACK

Cc*R

100Ω
100Ω

C

c

TO LOAD

0Ω
0Ω

c

R

CL

Package: SIP03

–V

s

*

* Bypassing required.

+V

11

12

*

s

PA90

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

SUPPLY VOLTAGE, +VS to –V
OUTPUT CURRENT, source, sink, peak 350mA, within SOA

S

400V

POWER DISSIPATION, continuous @ TC = 25°C 30W
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 .5 2 mV
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 = OPEN 1 µVrms

GAIN

OPEN LOOP, @ 15Hz RL = 2KΩ, CC = OPEN 94 111 dB
GAIN BANDWIDTH PRODUCT at 1MHz RL = 2KΩ, CC = OPEN 100 MHz
POWER BANDWIDTH RL = 2KΩ, CC = OPEN 470 kHz
PHASE MARGIN Full temperature range 60 °

OUTPUT

VOLTAGE SWING

3

IO = 200mA ±VS 12 ±VS 10 V
CURRENT, continuous 200 mA
SLEW RATE, AV = 100 CC = OPEN 240 300 V/µs
CAPACITIVE LOAD, AV = +1 Full temperature range 470 pF
SETTLING TIME to .1% CC = OPEN, 2V step 1 µs
RESISTANCE, no load 50 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 2.5 °C/W
RESISTANCE, DC, junction to case Full temperature range, F < 60Hz 4.2 °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 = 68pF.

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 PA90 is constructed from MOSFET transistors. ESD handling procedures must be observed.

TYPICAL PERFORMANCE
GRAPHS

PA90

40

POWER DERATING

32

24

16

8

0

0 25 50 75 100 125 150

INTERNAL POWER DISSIPATION, P(W)

CASE TEMPERATURE, T (°C)

C

SMALL SIGNAL RESPONSE

50

40

30

20

10

Cc = 68 pF
Cc = 10 pF

0

OPEN LOOP GAIN, A (dB)

Cc = 4.7 pF
Cc = OPEN

–10

100K

1M 10M

FREQUENCY, F (Hz)

1K

SLEW RATE

700
500

300

µ

200
100

70
50
40
30

SLEW RATE, (V/ S)

20
10

0.1

EXT. COMPENSATION CAPACITOR, C (pF)

1

10 100

C

CURRENT LIMIT

.2

90

PHASE RESPONSE

135

Φ

180

PHASE, (°)

Cc = 68 pF
Cc = 10 pF

225

Cc = 4.7 pF
Cc = OPEN

270

100k

1M 10M

FREQUENCY F (Hz)

OUTPUT VOLTAGE SWING

6

SO

5.5

5

4.5

4

3.5
0 0.15 0.2

.05

VOLTAGE DROP FROM SUPPLY, V – V (V)

OUTPUT CURRENT, I (A)

HARMONIC DISTORTION

1

0.1

RL = 1K
V = ±200V

S

A = 63

V

.1

P = 17.6W

O

P = 1W

.01

O

P = 5W

.001

O

10

DISTORTION, (%)

FREQUENCY, F (Hz)

NORMALIZED QUIES. CURRENT

Q

1.3

1.2

1.1

1.0
25 50 100

CASE TEMPERATURE, Tc (°C)

NORMALIZED QUIESCENT CURRENT, I (X)

75

125

POWER RESPONSE

400
300

P-P

O

200

C = 68pF

C = 10pF

C

C

100

80
70

OUTPUT VOLTAGE, V (V )

60
50

O

10K

20

100K

FREQUENCY, F (Hz)

INPUT NOISE VOLTAGE

15

N

10

7
5

3

2

100K100 1K 10K

INPUT NOISE VOLTAGE, V (nV Hz)

10 100 10K 100K

1K

FREQUENCY, F (Hz)

C = OPEN

C

C = 4.7pF

C

1M

.15

LIM

.1

.05

CURRENT LIMIT, II (A)

0

416

0 8 12 20 24

RESISTOR VALUE, R ( )

Ω

CL

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PA90

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 32 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.

500

DC, T

200mS

C

= 125

DC, T

°C

DC, T

C

= 85

C

= 25

°C

100mS

°C

300

, (mA)

S

200

OR –V

S

100

50

30

INPUT PROTECTION

Although the PA90 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 PA90 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

+IN

Q1

Q2

Q3

Q4

11, 12

PA90

7, 8

2

6

–V

Z2

S

20

OUTPUT CURRENT FROM +V

PULSE CURVES @ 10% DUTY CYCLE MAX

10

25 50 75 100 250 500

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.

125

PA90U REV. C SEPTEMBER 1999 © 1999 Apex Microtechnology Corp.

FIGURE 2.
OVERVOLTAGE

PROTECTION