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

4

EK04

EVALUATION KIT

FOR PA04 PIN-OUT

HS11 HEATSINK NOTE

The HS11 Heatsink is overkill for the average application. Once maximum power dissipation for the application is determined

(refer to “General Operating Considerations” and Application Note 11 in the APEX DATABOOK), the final mechanical design will

probably require substantially less heatsinking.

APEXMICROTECHNOLOGYmakesnorepresentationthattheuseorinterconnectionofthecircuitsdescribedhereinwillnotinfringe

on existing or future patent rights, nor do the descriptions contained herein imply the granting of licenses to make, use, or sell equip–

ment constructed in accordance therewith.

TYPICAL APPLICATION

The PA04 is well suited for wideband, low distortion, high

power applications. The circuit in Figure 4 displays the simplicity

of use offered by the PA04. The circuit is in an inverting gain of

10. This relatively low gain allows the amplifier to have more

than adequate loop gain available, resulting in extremely low

distortion at the power levels delivered. The use of the invert-

ing configuration avoids any concern of common mode effects.

Typical specs of such a circuit would read as follows:

Po = 200W

F = 10kHz

R

THD = .0061

FIGURE 4.

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OPTIONAL V BOOST

One of many inexpensive ways to acquire V boost for the

PA04 has been included as an option on this evaluation kit.

The addition of these parts not only increases swing, but also

extends the common mode range of the amplifier. The ground

connection of J3 needs to be made when assembled.

FIGURE 5.

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