PA08A - Apex Microtechnology

APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com

FEATURES

• WIDE SUPPLY RANGE — ±15V to ±150V

• PROGRAMMABLE OUTPUT CURRENT LIMIT

• HIGH OUTPUT CURRENT — Up to ±150mA

• LOW BIAS CURRENT — FET Input

APPLICATIONS

• HIGH VOLTAGE INSTRUMENTATION

• ELECTROSTATIC TRANSDUCERS & DEFLECTION

• PROGRAMMABLE POWER SUPPLIES UP TO 290V

• ANALOG SIMULATORS

DESCRIPTION

The PA08 is a high voltage operational amplifier designed

for output voltage swings of up to ±145V with a dual (±) supply

or 290V with a single supply. High accuracy is achieved with

a cascode input circuit configuration. All internal biasing is

referenced to a zener diode fed by a FET constant current

source. As a result, the PA08 features an unprecedented

supply range and excellent supply rejection. The output

stage is biased-on for linear operation. Internal phase com-

pensation assures stability at all gain settings. The safe

operating area (SOA) can be observed with all types of loads

by choosing the appropriate current limiting resistors. For

operation into inductive loads, two external flyback pulse

protection diodes are recommended. A heatsink may be

necessary to maintain the proper case temperature under

normal operating conditions.

This hybrid integrated circuit utilizes beryllia (BeO) sub-

strate, thick film resistors, ceramic capacitors and semicon-

ductor chips to maximize reliability, minimize size and give

top performance. Ultrasonically bonded aluminum wires pro-

vide reliable interconnections at all operating temperatures.

The 8-pin TO-3 package is hermetically sealed and electri-

cally isolated. The use of compressible thermal isolation

washers and/or improper mounting torque will void the prod-

uct warranty. Please see “General Operating Considerations”.

EQUIVALENT SCHEMATIC

TYPICAL APPLICATION

The PA08 as a pin driver is capable of supplying high test

voltages to a device under test (DUT). Due to the possibility of

short circuits to any terminal of the DUT, current limit must be

set to be safe when limiting with a supply to output voltage

differential equal to the amplifier supply plus the largest

magnitude voltage applied to any other pin of the DUT. In

addition, flyback diodes are recommended when the output of

the amplifier exits any equipment enclosure to prevent dam-

age due to electrostatic discharges. Refer to Application Note

7 for details on accuracy considerations of this circuit.

EXTERNAL CONNECTIONS

CL+

+IN

–IN

–V BAL

CL–

OUT

TOP VIEW

CL+

CL–

OUTPUT

()

R =

–V

R /1.6

NOTE: Input offset voltage trim optional.R = 10K ΩMAX

PA08

-132V

+132V 110K +V

-V

+132V

-132V

8.2Ω

±1mA

D.U.T.

DAC

ATE PIN DRIVER

Q1 Q3

Q12A Q12B

Q15

Q4 C3

Q11

Q16

Q19

Q17

Q10

Q9 C2

HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739

MICROTECHNOLOGY

POWER OPERATIONAL AMPLIFIERS

PA08 • PA08A

APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +VS to –VS300V

OUTPUT CURRENT, within SOA 200mA

POWER DISSIPATION, internal at TC = 25°C 17.5W

INPUT VOLTAGE, differential ±50V

INPUT VOLTAGE, common mode ±VS

TEMPERATURE, pin solder - 10s max 300°C

TEMPERATURE, junction1200°C

TEMPERATURE RANGE, storage –65 to +150°C

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

PARAMETER TEST CONDITIONS2MIN TYP MAX MIN TYP MAX UNITS

INPUT

OFFSET VOLTAGE, initial TC = 25°C±.5 ±2±.25 ±.5 mV

OFFSET VOLTAGE, vs. temperature TC = –25°C to +85°C±15 ±30 ±5±10 µV/°C

OFFSET VOLTAGE, vs. supply TC = 25°C±.5 * 2 µV/V

OFFSET VOLTAGE, vs. time TC = 25°C±75 * µV/√kh

BIAS CURRENT, initial3TC = 25°C550310pA

BIAS CURRENT, vs. supply TC = 25°C .01 * pA/V

OFFSET CURRENT, initial3TC = 25°C±2.5 ±50 ±1.5 ±10 pA

INPUT IMPEDANCE, DC TC = 25°C10

5*MΩ

INPUT CAPACITANCE TC = 25°C4*pF

COMMON MODE VOLTAGE RANGE4TC = –25°C to +85°C±VS–10 * V

COMMON MODE REJECTION, DC TC = –25°C to +85°C, VCM = ±90V 130 * dB

GAIN

OPEN LOOP GAIN at 10Hz TC = 25°C, RL = ∞118 * dB

OPEN LOOP GAIN at 10Hz TC = 25°C, RL = 1.2KΩ96 111 * * dB

GAIN BANDWIDTH PRODUCT at 1MHz TC = 25°C, RL = 1.2KΩ5 * MHz

POWER BANDWIDTH TC = 25°C, RL = 1.2KΩ90 * kHz

PHASE MARGIN TC = –25 to +85°C60*°

OUTPUT

VOLTAGE SWING4TC = 25°C, IO = 150mA ±VS–15 ±VS–8 * * V

VOLTAGE SWING4TC = –25o C to +85oC, IO = ±75mA ±VS–10 ±VS–5 * * V

VOLTAGE SWING4TC = –25o C to +85oC, IO = ±20mA ±VS–5 ±VS–3 * * V

CURRENT, peak TC = 85°C 150 * mA

SLEW RATE TC = 25°C3020*V/µs

CAPACITIVE LOAD, AV = 1 TC = –25 to +85°C10*nF

CAPACITIVE LOAD, AV > 4 TC = –25 to +85°C SOA *

SETTLING TIME to .1% TC = 25°C, RL= 1.2KΩ, 2V step 1 * µs

POWER SUPPLY

VOLTAGE TC = –55 to +125°C±15 ±100 ±150 * * * V

CURRENT, quiescent TC = 25°C 6 8.5 * * mA

THERMAL

RESISTANCE, AC junction to case5TC = –55 to +125°C, F > 60Hz 3.8 * °C/W

RESISTANCE, DC junction to case TC = –55 to +125°C, F < 60Hz 6.0 6.5 * * °C/W

RESISTANCE, junction to air TC = –55 to +125°C30*°C/W

TEMPERATURE RANGE, case Meets full range specification –25 85 * * °C

PA08A

PA08

PA08 • PA08A

NOTES: * The specification of PA08A is identical to the specification for PA08 in applicable column to the left.

1. Long term operation at the maximum junction temperature will result in reduced product life. Derate power dissipation to

achieve high MTTF.

2. The power supply voltage specified under typical (TYP) applies unless otherwise noted.

3. Doubles for every 10oC of temperature increase.

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

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

The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or

subject to temperatures in excess of 850°C to avoid generating toxic fumes.

CAUTION

APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com

TYPICAL PERFORMANCE

GRAPHS PA08 • PA08A

0 25 50 75 100 125

TEMPERATURE, T(°C)

POWER DERATING

INTERNAL POWER DISSIPATION, P(W)

-55 0 100

200

250

100

10 100 10K .1M

FREQUENCY, F (Hz)

INPUT NOISE VOLTAGE, V (nV/ Hz)

1 100 10M

FREQUENCY, F (Hz)

-20

120

SMALL SIGNAL RESPONSE

OPEN LOOP GAIN, A

(dB)

100

0 100 .1M 10M

–210

–150

–60

PHASE RESPONSE

–90

–30

50K .1M .3M .7M

FREQUENCY, F (Hz)

OUTPUT VOLTAGE, V (V )

1 100 1K 1M

FREQUENCY, F (Hz)

100

140

COMMON MODE REJECTION

COMMON MODE REJECTION CMR (dB)

120

11M

FREQUENCY, F (Hz)

140

POWER SUPPLY REJECTION

POWER SUPPLY REJECTION, PSR (dB)

120

10K 50K .2M

FREQUENCY, F (Hz)

300

COMMON MODE VOLTAGE

COMMON MODE VOLTAGE, V (Vpp)

200

1.5

–6

–2

2.0

0.5 30

PULSE RESPONSE

NORMALIZED SLEW RATE (X)

50 250

TOTAL SUPPLY VOLTAGE, V (V)

CURRENT LIMIT

CURRENT LIMIT, I (A)

LIM

10 10K .1M 20K 1M

INPUT NOISE

√

-25 25 50 75

150

POWER RESPONSE

.2M

10 100 1K 10K .1M

10 1K 10K .1M 1M

150

10 10K 1M

FREQUENCY, F (Hz)

PHASE, (°)ϕ

RELATIVE OPEN LOOP GAIN, A (dB)

1 2.5

–4

50 100 150 200 250 300

1.0

1.2

1.4

1.6

.5M

100

200

300

.5M

100

125

300

CASE TEMPERATURE, T (°C)

–180

–120

100

OPEN LOOP GAIN

SLEW RATE

–2

–4

–6 100 150 200

T = -25°C

T = 85°C

T = -25°C

R = 4.7

Ω

R = 10

Ω

R =1.2K

Ω

R =1.2K

Ω

R =1.2K

Ω

OUTPUT VOLTAGE, V (V)

V = ±5V, t = 100ns

IN r

TIME, t (µs)

R =1.2K

Ω

TOTAL SUPPLY VOLTAGE, V (V)

80 80

.1M

|+V | + |–V | = 300V

|+V | + |–V | = 100V

|+V | + |–V | = 300V

–V

OPERATING

CONSIDERATIONS

PA08 • PA08A

GENERAL

Please read the “General Operating Considerations”, which

covers stability, supplies, heatsinking, mounting, current limit,

SOA interpretation, and specification interpretation. Additional

information can be found in the application notes. For informa-

tion on the package outline, heatsinks, and mounting hardware,

see the “Package Outlines” and “Accessories” sections of the

handbook.

SAFE OPERATING AREA (SOA)

The output stage of most power amplifiers has two distinct

limitations:

1. The current handling capability of the transistor geometry

and the wire bonds.

2. The second breakdown effect which occurs whenever the

simultaneous collector current and collector-emitter voltage

exceeds specified limits.

The SOA curves combine the effect of these limits. For a

given application, the direction and magnitude of the output

current should be calculated or measured and checked against

the SOA curves. This is simple for resistive loads but more

complex for reactive and EMF generating loads. However, the

following guidelines may save extensive analytical efforts.

1. Under transient conditions, the following capacitive and

inductive loads are safe with the current limits set to the

maximum:

±VSC(MAX) L(MAX)

150V .4µF 280mH

125V .9µF 380mH

100V 2µF 500mH

75V 10µF 1200mH

50V 100µF 13H

2. The amplifier can handle any EMF generating or reactive

load and short circuits to the supply rails or simple shorts to

common if the current limits are set as follows:

SHORT TO ±VSC, SHORT TO

±VSC, L, OR EMF LOAD COMMON

150V 20mA 67mA

125V 27mA 90mA

100V 42mA 130mA

75V 67mA 200mA

50V 130mA 200mA

These simplified limits may be exceeded with further analysis

using the operating conditions for a specific application.

200

150

100

2080 100 120 150 170 200 250 300

SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE (V)

OUTPUT CURRENT FROM

+V OR –V (mA)

steady state

t = 5ms

t = 1ms

t = 0.5ms

t = 200µs

3. The output stage is protected against transient flyback.

However, for protection against sustained, high energy

flyback, external fast-recovery diodes should be used.

INDUCTIVE LOADS

Two external diodes as shown in Figure 1, are required to

protect these amplifiers from flyback (kickback) pulses

exceeding the supply voltages of the amplifier when driving

inductive loads. For component selection, these external

diodes must be very quick, such as ultra fast recovery diodes

with no more than 200 nanoseconds of reverse recovery time.

The diode will turn on to divert the flyback energy into the supply

rails thus protecting the output transistors from destruction due

to reverse bias.

A note of caution about the supply. The energy of the flyback

pulse must be absorbed by the power supply. As a result, a

transient will be superimposed on the supply voltage, the

magnitude of the transient being a function of its transient

impedance and current sinking capability. If the supply voltage

plus transient exceeds the maximum supply rating or if the AC

impedance of the supply is unknown, it is best to clamp the

output and the supply with a zener diode to absorb the transient.

INPUT PROTECTION

The input is protected against common mode voltages up to

the supply rails and differential voltages up to ±50V. Increased

protection against differential input voltages can be obtained by

adding 2 resistors, 2 capacitors and 4 diode connected FETs

as shown in Figure 2.

CURRENT LIMITING

Proper operation requires the use of two current limit resis-

tors, connected as shown in the external connection diagram.

The minimum value for RCL is 3.24Ω. However, for optimum

reliability it should be set as high as possible. Refer to the

“General Operating Considerations” section of the handbook

for current limit adjust details.

PROTECTION, INDUCTIVE LOAD PROTECTION, OVERVOLTAGE

IN4936 OR

UES1106

–V

100pf/200V

150KΩ

+IN

–IN

Fig. 1 Fig. 2

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.