Datasheet PB58, PB58A Datasheet (Apex)

POWER BOOSTER AMPLIFIERS

MICROTECHNOLOGY

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

FEA TURES

• WIDE SUPPLY RANGE — ±15V to ±150V

• HIGH OUTPUT CURRENT —

1.5A Continuous (PB58)

2.0A Continuous (PB58A)

• VOLTAGE AND CURRENT GAIN

• HIGH SLEW — 50V/µs Minimum (PB58)
75V/µs Minimum (PB58A)

• PROGRAMMABLE OUTPUT CURRENT LIMIT

• HIGH POWER BANDWIDTH — 320 kHz Minimum

• LOW QUIESCENT CURRENT — 12mA Typical

• EVALUATION KIT — See EK50

APPLICA TIONS

• HIGH VOLTAGE INSTRUMENTATION

• Electrostatic TRANSDUCERS & DEFLECTION

• Programmable Power Supplies Up to 280V p-p

DESCRIPTION

The PB58 is a high voltage, high current amplifier designed
to provide voltage and current gain for a small signal, general
purpose op amp. Including the power booster within the feed­back loop of the driver amplifier results in a composite amplifier
with the accuracy of the driver and the extended output voltage
range and current capability of the booster. The PB58 can also
be used without a driver in some applications, requiring only an
external current limit resistor to function properly.

The output stage utilizes complementary MOSFETs, provid­ing symmetrical output impedance and eliminating second
breakdown limitations imposed by Bipolar Transistors. Internal
feedback and gainset resistors are provided for a pin-strapable
gain of 3. Additional gain can be achieved with a single external
resistor. Compensation is not required for most driver/gain
configurations, but can be accomplished with a single external
capacitor. Enormous flexibility is provided through the choice of
driver amplifier, current limit, supply voltage, voltage gain, and
compensation.

This hybrid circuit utilizes a beryllia (BeO) substrate, thick film
resistors, ceramic capacitors and semiconductor chips to maxi­mize reliability, minimize size and give top performance.
Ultrasonically bonded aluminum wires provide reliable inter­connections at all operating temperatures. The 8-pin TO-3
package is electrically isolated and hermetically sealed using
one-shot resistance welding. The use of compressible isolation
washers voids the warranty.

TYPICAL APPLICATION

C

R

V

I

IN

+15V

OP

AMP

–15V

F

R

F

+Vs

IN

PB58

COM

–Vs

Figure 1. Inverting
composite amplifier.

R

CL

OUT

C

C

R

G

R

L

PB58 • PB58A

EQUIVALENT SCHEMATIC

IN

4

6.2K

GAIN

7

50K 3.1K

COM

5

COMP

8

EXTERNAL CONNECTIONS

COM

Q4

Q9

+Vs

3

IN

4

TOP VIEW

5

6

–Vs

Q1

Q11

CL

2

7

GAIN

Q2

Q6

3

+Vs

Q3

Q5

OUT

1

Q7

Q10

R

CL

OUT

1

COMP

8

C

C

R

G

2

CL

Q8

–Vs

6

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PB58 • PB58A

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

SUPPLY VOLTAGE, +VS to –V
OUTPUT CURRENT, within SOA 2.0A
POWER DISSIPATION, internal at TC = 25°C183W
INPUT VOLTAGE, referred to COM ±15V
TEMPERATURE, pin solder—10 sec max 300°C
TEMPERATURE, junction
TEMPERATURE, storage –65 to +150°C
OPERATING TEMPERATURE RANGE, case –55 to +125°C

SPECIFICATIONS

PARAMETER TEST CONDITIONS
INPUT

OFFSET VOLTAGE, initial ±.75 ±1.75 * ±1.0 V
OFFSET VOLTAGE, vs. temperature Full temperature range
INPUT IMPEDANCE, DC 25 50 * * kΩ
INPUT CAPACITANCE 3 * pF
CLOSED LOOP GAIN RANGE 3 10 25 * * * V/V
GAIN ACCURACY, internal Rg, Rf AV = 3 ±10 ±15 * * %
GAIN ACCURACY, external Rf AV = 10 ±15 ±25 * * %
PHASE SHIFT f = 10kHz, AVCL = 10, CC = 22pF 10 * °

f = 200kHz, AVCL = 10, CC = 22pF 60 * °

OUTPUT

VOLTAGE SWING Io = 1.5A (PB58), 2A (PB58A) VS–11 VS –8 VS–15 VS–11 V
VOLTAGE SWING Io = 1A VS–10 VS –7 * * V
VOLTAGE SWING Io = .1A VS–8 VS –5 * * V
CURRENT, continuous 1.5 2.0 A
SLEW RATE Full temperature range 50 100 75 * V/µs
CAPACITIVE LOAD Full temperature range 2200 * pF
SETTLING TIME to .1% RL = 100Ω, 2V step 2 * µs
POWER BANDWIDTH VC = 100 Vpp 160 320 240 * kHz
SMALL SIGNAL BANDWIDTH CC = 22pF, AV = 25, Vcc = ±100 100 * kHz
SMALL SIGNAL BANDWIDTH CC = 22pF, AV = 3, Vcc = ±30 1 * MHz

2

3

S

1

PB58

MIN TYP MAX MIN TYP MAX UNITS

–4.5 –7 * * mV/°C

300V

175°C

PB58A

POWER SUPPLY

VOLTAGE, ±V
CURRENT, quiescent VS = ±15 11 * mA

THERMAL

RESISTANCE, AC junction to case5Full temp. range, f > 60Hz 1.2 1.3 * * °C/W
RESISTANCE, DC junction to case Full temp. range, f < 60Hz 1.6 1.8 * * °C/W
RESISTANCE, junction to air Full temperature range 30 * °C/W
TEMPERATURE RANGE, case Meets full range specifications –25 25 85 * * * °C

NOTES: * The specification of PB58A is identical to the specification for PB58 in applicable column to the left.

CAUTION

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4

S

1. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation
to achieve high MTTF (Mean Time to Failure).

2. The power supply voltage specified under typical (TYP) applies, TC = 25°C unless otherwise noted.

3. Guaranteed by design but not tested.

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

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

6. +VS/–VS must be at least 15V above/below COM.

The PB58 is constructed from MOSFET transistors. ESD handling procedures must be observed.
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.

Full temperature range ±15
VS = ±60 12 * mA

VS = ±150 14 18 * * mA

6

±60 ±150 * * * V

TYPICAL PERFORMANCE
GRAPHS

PB58 • PB58A

100

POWER DERATING

80

60

40

20

0
–25 0 25 50 75 100

INTERNAL POWER DISSIPATION, P(W)

CASE TEMPERATURE, T (°C)

SMALL SIGNAL RESPONSE

80

C

60

40

20

OPEN LOOP GAIN, A (dB)

0
100 10M

1K 10K 100K 1M

FREQUENCY, F (Hz)

125

0

–45

–90

–135

–180

2

CURRENT LIMIT

1.5

LIM

1

.5

CURRENT LIMIT, I (A)

0

–25 25 125

CASE TEMPERATURE, T (°C)

SMALL SIGNAL RESPONSE

30

OPEN LOOP PHASE, (°)ϕ

AV = 25

20

AV = 10

10

AV = 3

0

C = 22pF

CLOSED LOOP GAIN, A (dB)

–10

1K 10K 10M

R = .47

CL

R = .68

CL

R = 1.5

CL

0 50 75 100

CL

CL

CL

C

100K 1M

FREQUENCY, F (Hz)

OUTPUT VOLTAGE SWING

O

14

S

12

Ω

Ω

Ω

C

10

V -

8

6

4

.01 .05 2

VOLTAGE DROP FROM SUPPLY, V — V (V)

OUTPUT CURRENT, I (A)

O

1 1.5

V +

O

O

SMALL SIGNAL RESPONSE

0

–45

AV = 10

CL

AV = 25

CL

–90

–135

C = 22pF

CLOSED LOOP PHASE, (°)ϕ

–180

C

1K 10K 10M

100K

FREQUENCY, F (Hz)

AV = 3

CL

1M

QUIESCENT CURRENT

20

Q

15

10

5

QUIESCENT CURRENT, I (mA)

0

–25 75

CASE TEMPERATURE, T (°C)

300
200

PP

Q

100

50
40

30
20

OUTPUT VOLTAGE, V (V )

10

100K 1M 10M

Vs = ±150V

Vs = ±100V

Vs = ±30V

50 125

POWER RESPONSE

300K 3M

FREQUENCY, F (Hz)

100025

C

INPUT OFFSET VOLTAGE

.5

OS

0

-.5

-1

-1.5

INPUT OFFSET VOLTAGE, V (V)

–25 75 1000 25 50 125

CASE TEMPERATURE, T (°C)

80

PULSE RESPONSE

C

60

Q

40
20

0

-20

-40

-60

OUTPUT VOLTAGE, V (V)

-80
1

2345 678

TIME, t (µs)

SLEW RATE VS. TEMP.

400

µ

300

+SLEW

200

100

SLEW RATE, SR (V/ s)

0
–25 75

-SLEW

CASE TEMPERATURE, T (°C)

HARMONIC DISTORTION

.1

DRIVER = TL070
V = ±60V

S

V = 95V

OPP

.03

.01

.003

DISTORTION, THD (%)

.001

300 3K 30K

1K

FREQUENCY, F (Hz)

Ω

L

R = 35

10K

1000 25 50 125

C

Ω

L

R = 1K

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PB58 • PB58A

)

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. The
minimum value is 0.33Ω with a maximum practical value of
47Ω. For optimum reliability the resistor value should be set as
high as possible. The value is calculated as follows: +I

+ .010, -IL = .65/RCL.

R

CL

= .65/

L

SAFE OPERATING AREA (SOA)

3
2

1

.5
.4

.3
.2

OUTPUT CURRENT

FROM +Vs or –Vs (A)

.1

10 20 30 40 50 100 200 300

SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, Vs –Vo (V

NOTE: The output stage is protected against transient flyback.
However, for protection against sustained, high energy flyback, exter-

nal fast-recovery diodes should be used.

steady state Tc = 125°C

steady state Tc = 25°C

steady state Tc = 85°C

t = 100ms

COMPOSITE AMPLIFIER CONSIDERATIONS

Cascading two amplifiers within a feedback loop has many
advantages, but also requires careful consideration of several
amplifier and system parameters. The most important of these
are gain, stability, slew rate, and output swing of the driver.
Operating the booster amplifier in higher gains results in a
higher slew rate and lower output swing requirement for the
driver, but makes stability more difficult to achieve.

STABILITY

Stability can be maximized by observing the following guide­lines:

1. Operate the booster in the lowest practical gain.

2. Operate the driver amplifier in the highest practical effec­tive gain.

3. Keep gain-bandwidth product of the driver lower than the
closed loop bandwidth of the booster.

4. Minimize phase shift within the loop.

A good compromise for (1) and (2) is to set booster gain from
3 to 10 with total (composite) gain at least a factor of 3 times
booster gain. Guideline (3) implies compensating the driver as
required in low composite gain configurations. Phase shift
within the loop (4) is minimized through use of booster and loop
compensation capacitors Cc and Cf when required. Typical
values are 5pF to 33pF.

Stability is the most difficult to achieve in a configuration
where driver effective gain is unity (ie; total gain = booster
gain). For this situation, Table 1 gives compensation values for
optimum square wave response with the op amp drivers listed.

DRIVER C

C

CH

OP07 - 22p 22p 4kHz 1.5

741 - 18p 10p 20kHz 7

LF155 - 4.7p 10p 60kHz >60

LF156 - 4.7p 10p 80kHz >60

TL070 22p 15p 10p 80kHz >60

For: R

= 33K, RI = 3.3K, RG = 22K

F

Table 1: Typical values for case where op amp effective gain = 1.

C

F

R

OP

AMP

+15V

–15V

R

I

V

IN

F

C

CH

IN

COM

F

+Vs

–Vs

PB58

C

GAIN

C

R

COMP

FPBW SR

CL

OUT

C

C

R

G

R

L

GAIN SET

RG = [ (Av-1) 3.1K] – 6.2K
RG + 6.2K

Av = +1

The booster’s closed-loop gain is given by the equation

*

3.1K

Figure 2. Non-inverting composite amplifier.

SLEW RATE

The slew rate of the composite amplifier is equal to the slew
rate of the driver times the booster gain, with a maximum value
equal to the booster slew rate.

above. The composite amplifier’s closed loop gain is deter­mined by the feedback network, that is: –Rf/Ri (inverting) or
1+Rf/Ri (non-inverting). The driver amplifier’s “effective gain”
is equal to the composite gain divided by the booster gain.

Example: Inverting configuration (figure 1) with

R i = 2K, R f = 60K, R g = 0 :

Av (booster) = (6.2K/3.1K) + 1 = 3
Av (composite) = 60K/2K = – 30
Av (driver) = – 30/3 = –10

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.

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

PB58U REV. H JANUARY 1998 © 1998 Apex Microtechnology Corp.

OUTPUT SWING

The maximum output voltage swing required from the driver
op amp is equal to the maximum output swing from the booster
divided by the booster gain. The Vos of the booster must also
be supplied by the driver, and should be subtracted from the
available swing range of the driver. Note also that effects of
Vos drift and booster gain accuracy should be considered
when calculating maximum available driver swing.