Datasheets datasheet Datasheet

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS

PA141/PA142 • PA141A/PA142A

MICROTECHNOLOGY

FEATURES

• MONOLITHIC MOS TECHNOLOGY

• LOW COST

• HIGH VOLTAGE OPERATION—350V

• LOW QUIESCENT CURRENT—2mA

• NO SECOND BREAKDOWN

• HIGH OUTPUT CURRENT—120 mA PEAK

• AVAILABLE IN DIE FORM—CPA141

APPLICATIONS

• PIEZO ELECTRIC POSITIONING

• ELECTROSTATIC TRANSDUCER & DEFLECTION

• DEFORMABLE MIRROR FOCUSING

• BIOCHEMISTRY STIMULATORS

• COMPUTER TO VACUUM TUBE INTERFACE

DESCRIPTION

The PA141/PA142 are high voltage monolithic MOSFET
operational amplifiers achieving performance features
previously found only in hybrid designs while increasing
reliability. Inputs are protected from excessive common mode
and differential mode voltages. The safe operating
area (SOA) has no second breakdown limitations and
can be observed with all type loads by choosing
an appropriate current limiting resistor. External com­pensation provides the user flexibility in choosing
optimum gain and bandwidth for the application.

The PA141 is packaged in a hermetically sealed TO-3
and all circuitry is isolated from the case by an aluminum
nitride (AlN) substrate.

The PA142 is packaged in APEX’s hermetic ceramic
SIP package.

EQUIVALENT SCHEMATIC

Q1

Q5Q4

(1)

(2)

5

–IN

D2 D3 D4 D5

6

+IN

Q11

(8)

(9)

Q12

5

PA141 PIN NUMBER

(1)

PA142 PIN NUMBER

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

8

Q14

+V

I

LIM

1

4

OUT

–V

7

(5)

D1

2

COMP

COMP

3

Q6

Q8

Q13

Q2

Q3

Q7

Q9

Q10

20R

20R

2.2K

A2

PA141/142

Ω

10-PIN SIP

+175

8-PIN TO-3
PACKAGE STYLE CE

TYPICAL APPLICATION

Ref: APPLICATION NOTE 20: "Bridge Mode Operation of Power Amplifi ers"

R

V

IN

20R

+175

2.2K

A1

PA141/142

10pF

R

180

100 Ω

330pF

CL

PIEZO

TRANSDUCER

PACKAGE STYLE DW

10pF

R

CL

180

100

330pF

LOW COST 660V p-p

–175

PIEZO DRIVE

–175

Two PA141/PA142 amplifi ers operated as a bridge driver
for a piezo transducer provides a low cost 660 volt total drive
capability. The R
gain of A2 at high frequencies. If R

network serves to raise the apparent

N CN

is set equal to R the

N

amplifi ers can be compensated identically and will have
matching bandwidths.

EXTERNAL CONNECTIONS

(6)

S

OUT

(7)

(10)

PA141

S

PA142

COMP

4

–IN

R

CL

2

C

COMP

R

C

3

PHASE

C

COMPENSATION

Gain C

1 18pF 2.2K

I

LIM

1

10 10pF 2.2K
30 3.3pF 2.2K

C

TOP VIEW

5

6

+IN

12345678910

–IN +IN

–V

7

S

+V

NC –V

S

330pF

S

C

8

S

C ,C ARE NPO RATED

R

FOR FULL SUPPLY VOLTAGE.

S

100 Ω

TOP VIEW

S

R

+V

100Ω

330pf

3

=

CL

I

LIM

I

LIM

S

R

S

C

S

R

C

C

C

R

C

C

C

R

CL

NOTE: PA141 Recommended mounting torque is 4-7 in•lbs
(.45 -.79 N•m)

CAUTION: The use of compressible, thermally conductive
insulators may void warranty.

Rn

Cn

C

C

OUTNC

C

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1

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONSPA141/PA142 • PA141A/PA142A

ABSOLUTE MAXIMUM RATINGS

SUPPLY VOLTAGE, +VS to –V
OUTPUT CURRENT, continuous within SOA 60 mA 60 mA

S

350V 350V

OUTPUT CURRENT, peak 120 mA 120 mA
POWER DISSIPATION, continuous @ TC = 25°C 12W 9W
INPUT VOLTAGE, differential ±16 V ±16 V

PA141/PA141A PA142/PA142A

INPUT VOLTAGE, common mode ±V
TEMPERATURE, pin solder – 10 sec 300°C 220°C

S ±VS

TEMPERATURE, junction2 150°C 150°C
TEMPERATURE, storage –65 to +150°C –65 to +150°C
TEMPERATURE RANGE, powered (case) –40 to +125°C –40 to +125°C

SPECIFICATIONS

PA141/PA142 PA141A/PA142A

PARAMETER TEST CONDITIONS1 MIN TYP MAX MIN TYP MAX UNITS

INPUT

OFFSET VOLTAGE, initial 25 40 15 30 mV
OFFSET VOLTAGE, vs. temperature

4, 7

Full temperature range 70 130 40/* 65/* µV/°C
OFFSET VOLTAGE, vs supply 20 32 * * µV/V
OFFSET VOLTAGE, vs time 75 * µV kh
BIAS CURRENT, initial
BIAS CURRENT, vs supply .2/.5 .5/50 * * pA/V
OFFSET CURRENT, initial
INPUT IMPEDANCE, DC 10

7

7

5/100 5

2.5/100 50/400 * * pA

0/2000

11 *

* * pA

INPUT CAPACITANCE 5 * pF
COMMON MODE, voltage range ±VS–12 * V
COMMON MODE REJECTION, DC V
NOISE, broad band 10kHz BW, RS = 1K 50
NOISE, low frequency 1-10 Hz 110 * µV p-p

= ±90V DC 84 94 * * dB

CM

* µV RMS

GAIN

OPEN LOOP at 15Hz RL = 5K 94 106 * * dB
BANDWIDTH, open loop 1.6 * MHz
POWER BANDWIDTH CC = 10pf, 280V p-p 26 * kHz
PHASE MARGIN Full temperature range 60 * °

OUTPUT

VOLTAGE SWING IO = 40mA ±VS–12
CURRENT, peak5 120 * mA

±VS

–10

±VS–10 ±VS–

8.5 V

CURRENT, continuous 60 * mA
SETTLING TIME to .1% CC = 10pF, 10V step, AV = –10 12 * µs
SLEW RATE CC = OPEN 40 * V/µs
CAPACITIVE LOAD AV = +1 10 * nF
RESISTANCE6, no load RCL = 0
RESISTANCE6, 20 mA load RCL = 0

POWER SUPPLY

VOLTAGE

3

See Note 3 ±50 ±150 ±175 * * * V

150 *
25 *

CURRENT, quiescent 1.6 2.0 .9 1.4 1.8 mA

THERMAL

PA141 RESIS
PA142 RESIS
PA141 RESIS
PA142 RESIS

TANCE, AC junction to case F > 6
TANCE, AC junction to case F > 6
TAN CE, DC junction to case F < 6
TAN CE, DC junction to case F < 6

0Hz 5.4 6.5 * * °C/W
0Hz 7 10 * * °C/W
0Hz 9 10.4 * * °C/W

0Hz 12 14 * * °C/W
PA141 RESISTANCE, junction to air Full temperature range 30 * °C/W
PA142 RESISTANCE, junction to air Full temperature range 55 * °C/W
TEMPERATURE RANGE, case Meets full range specifi cations –25 +85 * * °C

NOTES: * The specifi cation for PA141A/PA142A is identical to the specifi cation for PA141/PA142 in applicable column to the left.

1. Unless otherwise noted TC = 25°C, CC = 18pF, RC = 2.2K. DC input specifi cations are ± value given. Power supply voltage

is typical rating.

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 heatsink data sheet.

3. Derate maximum supply voltage .5 V/°C below case temperature of 25°C. No derating is needed above TC = 25°C.

4. Sample tested by wafer to 95%.

5. Guaranteed but not tested.

6. The selected value of R

7. Specifi cations separated by / indicate values for the PA141 and PA142 respectively.

CAUTION

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

The PA141/PA142 is constructed from MOSFET transistors. ESD handling procedures must be observed.

must be added to the values given for total output resistance.

CL

2

TYPICAL PERFORMANCE

GRAPHS PA141/PA142 • PA141A/PA142A

15

12

POWER DERATING

T = T

C

T = T

C

9

6

T = T

A

PA141

PA142

3

T = T

A

0

0255075100 125

INTERNAL POWER DISSIPATION, P(W)

120

TEMPERATURE, T (°C)

SMALL SIGNAL RESPONSE

100

80

60

CC = 3.3pF

CC = 10pF

40

20

OPEN LOOP GAIN, A(dB)

0

–20

1100 10M

CC = 18pF

10 1K 10K .1M 1M

FREQUENCY, F (Hz)

140

CURRENT LIMIT

130

120

110

+I

LIM

–I

LIM

100

90

80

NORMALIZED CURRENT LIMIT, (%)

–25 25 50 75

–50 0 100

CASE TEMPERATURE, T (°C)

PHASE RESPONSE

0

–30

–60

CC = 3.3pF

CC = 10pF

CC = 18pF

–90

CC = 18pF

–120

PHASE, (°)ϕ

–150

CC = 3.3pF

–180

–210

10 10K 1M

1100 .1M 10M

CC = 10pF

1K

FREQUENCY, F (Hz)

60

40

CURRENT LIMIT

+I

LIM

20

0

–20

-I

LIM

–40

CURRENT LIMIT RANGE, I (mA)

125

C

–60

0300400

100 200

CURRENT LIMIT RESISTOR, RCL (Ω )Ω

500

POWER RESPONSE

400

PP

200

O

100

80

60

40

OUTPUT VOLTAGE, V (V )

CC = 18pF

20

10K 20K .2M.1M

30K

50K .3M .5M 1M

FREQUENCY, F (Hz)

RL = 10K Ω

CC = 10pF

CC = 3.3pF

HARMONIC DISTORTION

1.0
AV = 20

.6

CC = 3.3pf

.4

RL = 2K Ω

.2

.1

VO = 30V
.06
.04

.02

DISTORTION, (%)

.01

.006
.004

.002

100 10K

PP

VO = 180V

VO = 60V

PP

3K 100K

30K200 1K 0

PP

FREQUENCY, F (Hz)

COMMON MODE REJECTION

120

100

80

60

40

20

0

10 10K .1M

11001K 1M

COMMON MODE REJECTION, CMR (dB)

FREQUENCY, F (Hz)

60

50

SLEW RATE

QUIESCENT CURRENT

150

130

40

110

30

20

SLEW RATE, V/µs

10

0

COMPENSATION CAPACITANCE, C

42081612

C

(pf)

POWER SUPPLY REJECTION

120

100

+V

80

60

–V

40

20

0

10 100 1K 10K .1M

11M

POWER SUPPLY REJECTION, PSR (dB)

FREQUENCY, F (Hz)

S

S

90

70

50

100 150 300 350

NORMALIZED QUIESCENT CURRENT, (%)

TOTAL SUPPLY VOLTAGE, V

(V)

OUTPUT VOLTAGE SWING

O

18

– V

S

16

14

12

10

8

6

4

2

25°C +OUT

0

04060

20 120

OUTPUT CURRENT, I

VOLTAGE DROP FROM SUPPLY, V

= 85°C

C

T

= 25°C

C

T

= -25°C

T

C

200

85°C –OUT

25°C – OUT

–25°C – OUT

–25°C +OUT

250

85°C +OUT

80

(mA)

O

100

S

(V)

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3

CONSIDERATIONSPA141/PA142 • PA141A/PA142A

OPERATING

GENERAL

Please read Application Note 1 “General Operating
Considerations” which covers stability, supplies, heat sinking,
mounting, current limit, SOA interpretation, and specifi cation
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

For proper operation the current limit resistor, RCL, must be
connected as shown in the external connection diagram. The
minimum value is 18 ohms, however for optimum reliability
the resistor value should be set as high as possible. The
value can be estimated as follows with the maximum practical
value of 500 ohms.

R

Use the typical performance graphs as a guide for expected
variations in current limit value with a given R
over temperature. The selected value of R
to the specifi ed typical value of output resistance to calculate
the total output resistance. Since the load current passes
through R

the value selected also affects the output voltage

CL

swing according to:

where VR is the voltage swing reduction.

When the amplifier is current limiting, there may be
small signal spurious oscillation present during the current
limited portion of the negative half cycle. The frequency
of the oscillation is not predictable and depends on the
compensation, gain of the amplifi er, and load. The oscillation
will cease as the amplifi er comes out of current limit.

=

CL

V

3

I

LIM

= IO R

R

and variations

CL

must be added

CL

CL

*

INPUT PROTECTION

The PA141/142 inputs are protected against common mode
voltages up the supply rails and differential voltages up to
±16 volts as well as static discharge. Differential voltages
exceeding 16 volts will be clipped by the protection circuitry.
However, if more than a few milliamps of current is available
from the overload source, the protection circuitry could be
destroyed. The protection circuitry includes 300 ohm current
limiting resistors at each input, but this may be insuffi cient
for severe overloads. It may be necessary to add external
resistors to the application circuit where severe overload
conditions are expected. Limiting input current to 1mA will
prevent damage.

STABILITY

The PA141/142 has sufficient phase margin when
compensated for unity gain to be stable with capacitive loads
of at least 10 nF. However, the low pass circuit created by the
sumpoint (–in) capacitance and the feedback network may
add phase shift and cause instabilities. As a general rule,
the sumpoint load resistance (input and feedback resistors
in parallel) should be 5K ohm or less at low gain settings
(up to 10). Alternatively, use a bypass capacitor across
the feedback resistor. The time constant of the feedback
resistor and bypass capacitor combination should match
the time constant of the sumpoint resistance and sumpoint
capacitance.

The PA141/142 is externally compensated and performance
can be tailored to the application. Use the graphs of small
signal gain and phase response as well as the graphs for
slew rate and power response as a guide. The compensation
capacitor C
The compensation capacitor and associated resistor R
must be mounted closely to the amplifi er pins to avoid
spurious oscillation. An NPO capacitor is recommended
for compensation.

must be rated at 350V working voltage.

C

C

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4

OPERATING
CONSIDERATIONS

PA141/PA142 • PA141A/PA142A

SAFE OPERATING AREA (SOA)

The MOSFET output stage of this power operational

amplifi er has two distinct limitations:

1. The current handling capability of the die metallization.

2. The temperature of the output MOSFETs.

NOTE: The output stage is protected against transient
fl yback. However, for protection against sustained, high energy
fl yback, external fast-recovery diodes should be used.

200

120

100

, (mA)

S

50

OR –V

S

40

30

20

10

5
4

3

OUTPUT CURRENT FROM +V

PULSE CURVES @ 10% DUTY CYCLE MAX

2

10 20 30 50 100 200 300 500

SUPPLY TO OUTPUT DIFFERENTIAL, VS -VO (V)

200

PA141 SOA

300mS

DC, T

PA142 SOA

DC, T

C

= 125°C

DC

C

= 85°C

200mS

APPLICATION REFERENCES:

For additional technical information please refer to the

following Application Notes:

AN 1: General Operating Considerations
AN 3: Bridge Circuit Drives
AN 25: Driving Capacitive Loads
AN 38: Loop Stability with Reactive Loads

120

100

, (mA)

S

50

OR –V

S

40

30

20

10

5
4

OUTPUT CURRENT FROM +V

3

PULSE CURVES @ 10% DUTY CYCLE MAX

2

10 20 30 50 100 200 300 500

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 specifi cations are subject to change without notice.

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300mS

DC, T

DC, T

C

= 125°C

100mS

200mS

DC

C

= 85°C

PA141/142U REV. A MARCH 2002 © 2002 Apex Microtechnology Corp.

5