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

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FEATURE

• HIGH FREQUENCY SWITCHING — 200 kHz

• WIDE SUPPLY RANGE—16-200V

• 15A CONTINUOUS TO 65°C CASE

• 3 PROTECTION CIRCUITS

• ANALOG OR DIGITAL INPUTS

• SYNCHRONIZED OR EXTERNAL OSCILLATOR

• FLEXIBLE FREQUENCY CONTROL

APPLICATIONS

• REACTIVE LOADS

• LOW FREQUENCY SONAR

• LARGE PIEZO ELEMENTS

• OFF-LINE DRIVERS

• C-D WELD CONTROLLER

DESCRIPTION

The SA12 is a pulse width modulation amplifier that can

supply 3000W to the load. An internal 400kHz oscillator re-

quires no external components. The clock input stage divides

the oscillator frequency by two, which provides the 200 kHz

switching frequency. External oscillators may also be used to

lower the switching frequency or to synchronize multiple ampli-

fiers. Current sensing is provided for each half of the H-bridge

giving amplitude and direction data. A shutdown input turns

off all four drivers of the H-bridge output. A high side current

limit and the programmable low side current limit protect the

amplifier from shorts to supply or ground in addition to load

shorts. The H-bridge output MOSFETs are protected from

thermal overloads by directly sensing the temperature of the

die. The 12-pin hermetic MO-127 power package occupies

only 3 square inches of board space.

BLOCK DIAGRAM AND TYPICAL APPLICATION

TORQUE MOTOR DRIVER

EXTERNAL CONNECTIONS

M I C R O T E C H N O L O G Y

SA12

12-PIN POWER DIP

PACKAGE STYLE CR