PA52 • PA52A

PA52U Rev J

9

SAFE OPERATING AREA (SOA)

Figure 12: SOA

GENERAL

Please read Application Note 1 “General Operating Considerations” which covers stability, supplies, heat

sinking, mounting, current limit, SOA interpretation, and specification interpretation. Visit www.apexana-

log.com for Apex Microtechnology’s complete Application Notes library, Technical Seminar Workbook, and

Evaluation Kits.

CURRENT LIMIT

There is no internal circuit provision for current limit in the PA52. However, the PA52 circuit board in the

PA52 evaluation kit does provide a means whereby the output current can be sensed. An external circuit cur-

rent limit can thereby be implemented if needed.

BOOST OPERATION

With the VBOOST feature the small signal stages of the amplifier are operated at higher supply voltages

than the amplifier’s high current output stage. +VBOOST (pin 11) and –VBOOST (pin 12) are connected to the

small signal circuitry of the amplifier. +VS (pin 9,10) and –VS (pin 3,4) are connected to the high current out-

put stage. An additional 10V on the VBOOST pins is sufficient to allow the small signal stages to drive the out-

80

10

1

0.1

1

10

100

DC

T

C

=

125°C

DC

T

C

=

85°C

DC

T

C

=

25°C

t =

10ms

t =

1ms

V

S

-V

O

(V)