MP230 Просмотр технического описания (PDF) - Apex Microtechnology

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MP230

POWER OPERATIONAL AMPLIFIER

Apex Microtechnology 

MP230

OPERATING

CONSIDERATIONS

any parasitic resistances RP, formed by socket and solder joints

as well as internal amplifi er 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

be calculated as follows: RLIM = .65/ILIMIT

BOOST OPERATION

With the boost feature the small signal stages of the amplifier

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

high current output stage. +VB (pin 1) and -VB (pin 38) are

connected to the small signal stages. An additional 10V on the

+VB and -VB pin is sufficient to allow the small signal stages

to drive the output stage into the triode region and improve

the output voltage swing for extra efficient operation when

required. When the boost feature is not needed +VS and

-VS are connected to +VB and -VB respectively. +VB and -VB

must not be operated at supply voltages less than +VS and

-VS respectively.

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

LSD may float from -VB to +VB - 10V. Shutdown can be used

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.

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MP230U REV F DECEMBER 2004 © 2004 Apex Microtechnology Corp.

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