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5

as well as internal amplifier losses. The current limiting resistor

may not be placed anywhere in the output circuit except where

shown in Figure 2. The value of the current limit resistor can

BOOST OPERATION

With the boost feature the small signal stages of the amplifier

are operated at a higher supply voltages than the amplifier’s

the output stage into the triode region and improve the output

voltage swing for extra efficient operation when required. When

SHUTDOWN

The output stage is turned off by applying a 5V level to HSD

(pin 8) relative to LSD (pin 7). This is a non-latching circuit. As

long as HSD remains high relative to LSD the output stage will

be turned off. LSD will normally be tied to signal ground but

to lower quiescent current for standby operation or as part of

a load protection circuit.

BIAS CLASS OPTION

Normally pin 5 (Iq) is left open. But when pin 5 is connected

to pin 6 (Cc1) the quiescent current in the output stage is dis-

abled. This results in lower quiescent power, but also class

C operation of the output stage and the resulting crossover

distortion. In many applications, such as driving motors, the

distortion may be unimportant and lower standby power dis-

sipation is an advantage.

OPERATING

CONSIDERATIONS

MP240

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.

MP240U REV F JANUARY 2006 © 2006 Apex Microtechnology Corp.