Apex Digital PA40 User Manual

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER

MICROTECHNOLOGY

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

FEATURES

• MONOLITHIC MOS TECHNOLOGY

• LOW COST

• HIGH VOLTAGE OPERATION—250V

• LOW QUIESCENT CURRENT—2mA

• NO SECOND BREAKDOWN

• HIGH OUTPUT CURRENT—120 mA PEAK

APPLICATIONS

• TELEPHONE RING GENERATOR

• PIEZO ELECTRIC POSITIONING

• ELECTROSTATIC TRANSDUCER & DEFLECTION

• DEFORMABLE MIRROR FOCUSING

DESCRIPTION

The PA40 is a high voltage monolithic MOSFET operational
amplifi er 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. External compensation provides the
user fl exibility in choosing optimum gain and bandwidth
for the application.

The PA40 is packaged in Apex's 7 LEAD TO220 package.
The metal back of the package is tied to –Vs. The 15 mil
minimum spacing of the TO220 package is adequate to
stand-off the 250V rating of the PA40. The user must insure
that a minimum of 11 mils spacing is maintained between
pins for the circuit board artwork. If spacing is less than 11
mils, the voltage must be derated.

TYPICAL APPLICATION

15V

2.5K + 15

10K 10K

7

ICL8038

8

*

* 1.5 µF @ 16Hz

1.2 µF @ 20Hz

1110

54

–15V

MUR120

6

2

82K

IN6300A

MUR120

140V

100K2.67K

IN6300A

.22

MUR130

3.3pF

2.2K

PA40

.22

–140V

90Vrms

100

330pf

MUR130

Telephone Ring Generator

PA40

EQUIVALENT SCHEMATIC

D1

Q1

1

–IN

D2 D3 D4 D5

2

+IN

Q11

Q5Q4

Q12

EXTERNAL CONNECTIONS

PHASE COMPENSATION
Gain C

≤ 1 18pF 2.2K

≥ 10 10pF 2.2K
≥ ≥30 3.3pF 2.2K

NOTE: At gains above 30, Rc and Cc
may be omitted.

COMP
COMP

R

C

6

7

Q6

Q8

Q13

SUB

C

3

+V

S

Q2

Q10

Q3

I

OUT

5

Q14

–V

S

4

The PA40 is set for a gain of 38.5 boosting the 2.33V signal
to 90V . The recommended compensation for gains above 30
is used. If capacitive loading is at least 330pF at all times, the
recommended snubber network may be omitted.

1234 567

- IN

+ IN

+VS

-VS

OUT

COMP (Rc)

COMP (Cc)

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PA40

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

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

S

250V

OUTPUT CURRENT, peak 120 mA
POWER DISSIPATION, continuous @ TC = 25°C 14W
INPUT VOLTAGE, differential ±16 V
INPUT VOLTAGE, common mode ±V
TEMPERATURE, pin solder – 10 sec 220°C

S

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

SPECIFICATIONS

PA40

PARAMETER TEST CONDITIONS1 MIN TYP MAX UNITS
INPUT

OFFSET VOLTAGE, initial 15 30 mV
OFFSET VOLT AGE, vs. temperature

4

Full temperature range 70 130 µV/°C
OFFSET VOLTAGE, vs supply 20 32 µV/V
OFFSET VOLTAGE, vs time 75 µV kh
BIAS CURRENT, initial 50 2

00

pA
BIAS CURRENT, vs supply 2 20 pA/V
OFFSET CURRENT, initial 50 200 pA
INPUT IMPEDANCE, DC 101

1

INPUT CAPACITANCE 5 pF
COMMON MODE, voltage range ±VS–12 V
COMMON MODE REJECTION, DC VCM = ±90V DC 84 94 dB
NOISE, broad band 10kHz BW, RS = 1K 50
NOISE, low frequency 1-10 Hz 110 µV p-p

µV RMS

GAIN

OPEN LOOP at 15Hz RL =
BANDWIDTH, open loop 1.6 MHz

5K 94 106 dB

POWER BANDWIDTH CC = 10pf, 280V p-p 26 kHz
PHASE MARGIN Full temperature range 60 °

OUTPUT

VOLTAGE SWING IO = 40mA ±VS–12
CURRENT, peak

5

±VS–10

V

120 mA
CURRENT, continuous 60 mA
SETTLING TIME to .1% CC = 10pF, 10V step, AV =
SLEW RATE CC = OPEN 40 V/µs
CAPACITIVE LOAD AV = +1 10 nF
RESISTANCE6, n
RESISTANCE6, 20

POWER SUPPLY

VOLTAGE

o

load RCL = 0 150

m

A load RCL = 0

3

See Note 3 ±50 ±125 V

10 12 µs

–

25

CURRENT, quiescent 1.6 2.0 mA

THERMAL

ANCE, AC junction to case6 F > 6

RESIST

ANCE, DC junction to case6 F < 6

RESIST

0Hz 5.9 6.85 °C/W

0Hz 7.7 8.9 °C/W
RESISTANCE, junction to air Full temperature range °C/W
TEMPERATURE RANGE, case Meets full range specifi cations –25 25 +85 °C

NOTES: 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 .

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

4. Sample tested by wafer to 95%.

= 25°C.

5. Guaranteed but not tested.

CAUTION

The PA40 is constructed from MOSFET transistors. ESD handling procedures must be observed.

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

TYPICAL PERFORMANCE
GRAPHS

PA40

16

POWER DERATING

14
12

10

8
6

4
2

0

0255075100 125

INTERNAL POWER DISSIPATION, P(W)

120
100

80
60

40

OPEN LOOP GAIN, A(dB)

–20

1.0

.06
.04

.02

DISTORTION, (%)

.01

.006
.004

.002

120

TEMPERATURE, Tj (°C)

SMALL SIGNAL RESPONSE

CC = 3.3pF

CC = 10pF

CC = 18pF

20

0

10 1K 10K .1M 1M

1 100 10M

FREQUENCY, F (Hz)

HARMONIC DISTORTION

AV = 20

.6

= 3.3pf

C

.4

C

R

= 2K Ω

L

.2
.1

VO = 30V

PP

VO = 180V

VO = 60V

PP

100 10K

3K 100K

30K200 1K

FREQUENCY, F (Hz)

COMMON MODE REJECTION

PHASE RESPONSE

0

–30
–60

CC = 3.3pF

CC = 10pF

–90

CC = 18pF

–120

PHASE, (°)ϕ

–150

CC = 3.3pF

–180
–210

1 100 .1M 10M

10 10K 1M

1K

FREQUENCY, F (Hz)

60

SLEW RATE

50

40

30

20

SLEW RATE, V/µs

10

0

0

42081612

COMPENSATION CAPACITANCE, C

POWER SUPPLY REJECTION

120

100

80

PP

60

–V

40

20

0

11M

POWER SUPPLY REJECTION, PSR (dB)

10 100 1K 10K .1M

FREQUENCY, F (Hz)

CC = 10pF

S

CC = 18pF

+V

S

C

(pf)

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)

QUIESCENT CURRENT

150

130

110

90

T

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

200

85°C

25°C

–

6
4
2

25°C +OUT

0

20 120

04060

OUTPUT CURRENT, I

VOLTAGE DROP FROM SUPPLY, V

RL = 10KΩ

CC = 10pF

CC = 3.3pF

C

= 85°

C

= 25°C

C

T

= -25°C

T

C

250

–OUT

OUT

–

25°C –OUT

–25°C +OUT

85°C +OUT

80

100

(mA)

O

S

(V)

POWER RESPONSE

100

80

60

40

20

0

10 10K .1M

1 100 1K 1M

COMMON MODE REJECTION, CMR (dB)

FREQUENCY, F (Hz)

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PA40

OPERATING

CONSIDERATIONS

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.

INPUT PROTECTION

The PA40 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 PA40 has suffi cient 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 1K 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 PA40 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

must be rated at 250V working voltage. The compensation

C

C

capacitor and associated resistor R
to the amplifi er pins to avoid spurious oscillation. An NPO
capacitor is recommended for compensation.

must be mounted closely

C

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

2

10 20 30 50 100 200 300 500

PA40 SOA

300mS

DC, T

C

= 85°C

200mS

DC, T

C

= 25°C

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.

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

PA40U REV. B JUNE 2001 © 2001 Apex Microtechnology Corp.