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Alternating-output PWM controller

SG3525A Internal Circuitry

Explore the internal circuitry and functional stages of SG3525A.

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Inside SG3525A

Clock, PWM latch and two alternating drivers.

Compact SG3525A cutaway with reference and UVLO, RC oscillator, error amplifier, soft start, shutdown, PWM latch and alternating drivers.
Functional architecture; the timing network and regulated power stage are external.

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Select a stage to see its role and connections

Clock the steering circuit

The oscillator advances the flip-flop so the output channels alternate.

Gate each pulse

PWM demand and soft start control pulse length; shutdown and UVLO override the cycle.

Drive HIGH or LOW

VC powers two totem-pole stages. The off state is LOW.

Component view