30-PIN DIP

PACKAGE STYLE CL

APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com

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FEATURES

• HIGH INTERNAL DISSIPATION — 125 Watts

• HIGH VOLTAGE, HIGH CURRENT — 200V, 10A

• HIGH SLEW RATE — 10V/µs

• 4 WIRE CURRENT LIMIT SENSING

• OPTIONAL BOOST VOLTAGE INPUTS

APPLICATIONS

• LINEAR AND ROTARY MOTOR DRIVES

• YOKE/MAGNETIC FIELD EXCITATION

• PROGRAMMABLE POWER SUPPLIES TO ±95V

• INDUSTRIAL AUDIO

• PACKAGE OPTION - DIP10 - DUAL-IN-LINE

DESCRIPTION

The MP38 is a cost-effective high voltage MOSFET power

operational amplifier constructed with surface mount com-

ponents on a thermally conductive but electrically isolated

substrate.

While the cost is low the MP38 offers many of the same

features and performance specifications found in much more

expensive hybrid power amplifiers.

The metal substrate allows the MP38 to dissipate power

up to 125 watts and its power supply voltages can range up

to +/- 100 Volts (200V total). Optional boost voltage inputs

allow the small signal portion of the amplifier to operate at

higher supply voltages than the high current output stage.

The amplifier is then biased to achieve close linear swings

to the supply rails at high current for extra efficient operation.

External compensation tailors performance to the user needs.

A four-wire sense technique allows current limiting without

the need to consider internal or external mili-ohm parasitic

resistance in the output line. An Iq pin is available which can

be used to shut off the quiescent current in the output stage.

The output stage then operates class C and lowers quiescent

power dissipation. This is useful in applications where output

crossover distortion is not important.

EQUIVALENT SCHEMATIC

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The high power bandwidth and high voltage output of the

MP38 allows driving ultra-sonic transducers via a resonant

circuit including the transducer and a matching transformer.

The load circuit appears resistive to the MP38.

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EXTERNAL CONNECTIONS

* SEE "BYPASSING" PARAGRAPH

Phase Compensation

Gain

Cc

Rc

1

470pF

100Ω

≥ 3

220pF

Short

≥ 10

100pF

Short