Apex Microtechnology SA12 200kHz Switching Frequency PWM Amplifiers

Apex Microtechnology SA12 200kHz Switching Frequency PWM Amplifiers is a 15A, 200V amplifier that delivers up to 3000W to the load. It switches at a very high 200kHz frequency and is internally generated via a clock input stage. This divides the internal 400kHz oscillator by two while requiring no external components. External oscillators may be used to lower the switching frequency or to synchronize multiple amplifiers. The SA12L delivers an even higher switching frequency performance over an extended temperature range -40°C to +85°C.

SA12 includes protection features like current sensing to provide amplitude and direction data for each half of the device's bridge circuitry. It allows the shutdown input to turn 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 direct temperature sensing of the die. This PWM amplifier is housed in a 12-pin hermetic and isolated metal power package. It requires only three square inches of board space.


  • 200kHz high switching frequency
  • 16-200V wide supply range
  • 15A continuous high output current
  • Three 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


Typical Applications

Apex Microtechnology SA12 200kHz Switching Frequency PWM Amplifiers
Published: 2020-08-20 | Updated: 2022-03-11