Power output stage automatic bias system controls class AB output current in high-power amplifier output stages. The circuit works with external transistors and forms a unity-gain voltage follower when connected in the recommended configuration. It is suited for power MOSFET output devices and eliminates quiescent-current adjustments and critical transistor matching. The bias system senses each power transistor current with an external sense resistor, and a high-speed regulator loop controls drive to the output devices. Programmable current limiting and paralleled output stages support higher-current amplifier designs.
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| Function | Power output stage automatic bias system |
| Output stage class | Class AB |
| Bias current setting | Automatic, no adjustment required |
| Quiescent current thermal runaway protection | Eliminated by current-sense bias regulation |
| Device mismatch correction | Supported |
| Current limit | Programmable |
| Output stage paralleling | Multiple output stages may be paralleled for higher current |
| Supported external power devices | Power MOSFETs and external transistors |
| Amplifier configuration | Unity-gain voltage follower with external transistors |
| Package pin count | 8pins |
| Package option | PDIP narrow 0.3 inch |
| Package option | SOIC narrow 0.15 inch |
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