P r o d u c t I n n o v a t i o n F r o m

PB50

PB50U

1

PB50

FEATURES

•WIDESUPPLYRANGE—±30Vto±100V

•HIGHOUTPUTCURRENT—Upto2AContinuous

•VOLTAGEANDCURRENTGAIN

•HIGHSLEWRATE—

50V/µsMinimum

•PROGRAMMABLEOUTPUTCURRENTLIMIT

•HIGHPOWERBANDWIDTH—160kHzMinimum

•LOWQUIESCENTCURRENT—12mATypical

APPLICATIONS

•HIGHVOLTAGEINSTRUMENTATION

•ElectrostaticTRANSDUCERS&DEFLECTION

•ProgrammablePowerSuppliesUpto180Vp-p

DESCRIPTION

The PB50 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 feed-

back 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 PB50 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, provid-

ing symmetrical output impedance and eliminating secondary

breakdown limitations imposed by Bipolar Junction Transis-

tors. Internal feedback and gainset resistors are provided for

a pin-strappable 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. Although the booster can

be configured quite simply, 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 inter-

connections 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.

TYPICALAPPLICATION

Figure 1. Inverting composite amplifier.

OP

AMP

PB50

C

F

R

F

V

IN

R

I

+15V

–15V

IN

COM

+Vs

–Vs

R

CL

OUT

C

C

R

G

R

L

EQUIVALENTSCHEMATIC

EXTERNALCONNECTIONS

3

1

2

6

8

5

4

7

IN

GAIN

COM

COMP

Q1

Q4

Q2

Q3

Q5

Q6

Q7

Q8

Q10

Q9

+Vs

OUT

CL

–Vs

6.2K

50K

3.1K

1

2

3

4

5

6

7

8

TOP VIEW

CL

+Vs

IN

COM

–Vs

GAIN

R

G

OUT

R

CL

8-PINTO-3

PACKAGESTYLECE

Power Booster Amplifier

PB50

P r o d u c t I n n o v a t i o n F r o m

Copyright © Cirrus Logic, Inc. 2009

(All Rights Reserved)

http://www.cirrus.com

MAY 2009

APEX − PB50UREVJ