SA12
SA12 Datasheet
The SA12 is a pulse width modulation amplifier that can supply 3000W to the load. An internal 400kHz oscillator requires 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 amplifiers. 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
| Part | Datasheet |
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SA12 |
SA12 (pdf) |
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| P r o d u Sc tAIInn1nn2oovvaa t i o n FFrroomm Pulse Width Modulation Amplifiers SAS1A122 • HIGH FREQUENCY SWITCHING 200 kHz • WIDE SUPPLY • 15A CONTINUOUS TO 65°C case • 3 PROTECTION CIRCUITS • ANALOG OR DIGITAL INPUTS • SYNCHRONIZED OR EXTERNAL OSCILLATOR • FLEXIBLE FREQUENCY CONTROL • REACTIVE LOADS • LOW FREQUENCY SONAR • LARGE PIEZO ELEMENTS • OFF-LINE DRIVERS • C-D WELD CONTROLLER 12-pin Power DIP PACKAGE STYLE CR EXTERNAL CONNECTIONS The SA12 is a pulse width modulation amplifier that can supply 3000W to the load. An internal 400kHz oscillator requires 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 amplifiers. 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 Vcc 10 +PWM 3 100pF 28K CLK OUT CONTROL SIGNAL CLK IN 1 GND 5 CLK IN CLK OUT +PWM -PWM/RAMP GND ILIM/SHDN TOP 10 4 VIEW 9 ISENSE A OUT * VCC * +VS B OUT I SENSE B Case tied to pin Allow no current in case. Bypassing of supplies is required. Package is Apex MO-127 STD . See Outline Dimensions/Packages in Apex data book. *See text. As +PWM goes more positive, A OUT duty cycle increases. CURRENT LIMIT PWM OUTPUT DRIVERS SHUTDOWN CONTROL 9 +VS B OUT 8 A OUT 11 MOTOR I SENSE A 12 ILIM/SHDN 6 7 I SENSE B 5K .01uF RSENSE 1K RSENSE Copyright Cirrus Logic, Inc. 2009 All Rights Reserved |
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