1/14/2024 0 Comments What is totem pole outputThe drive circuit need an appropriate voltage offset between the base connections of the two halves to allow for the chain of B-E drops and control current appropriately to each, depending if it's on or off. When the drive signal switches, the devices that were previously on have the B-E junctions reverse biased equally, with the voltage divided via the diodes. The only things normally used in high speed / high power circuits with darlingtons are relatively low value base-emitter resistors at each stage and reverse diodes across each base-emitter on each device. You can get better power efficiency using Sziklai pairs. ![]() ![]() They are very different in operation and overall characteristics and should not be confused.Ī symmetric push pull with normal darlingtons gives a very reduced output swing and is inefficient power wise, due to the voltage drops across the power transistors when they are switched on. You are talking about a symmetric push-pull type circuit, Class B amp style.
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