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Alternating-output PWM controller

SG3525A Working Principle

Learn how SG3525A works with an illustrated explanation and practical readings.

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SG3525A at a glance

Follow the labeled connections and functional stages

SG3525A working principle: illustrated functional stages, basic circuit and connections
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How it works

3 stages · Explore one step at a time

Step 1 / 3

Set the clock and dead time

RT6 and CT5 set the charging interval. RD between pins 5 and 7 lengthens capacitor discharge and the blanking interval.

Step 2 / 3

Release pulses gradually

Soft start limits PWM demand as its capacitor charges. The error amplifier determines the requested conduction after startup.

Step 3 / 3

Steer and protect

Outputs A and B take alternate cycles. Shutdown or undervoltage lockout makes both outputs LOW.

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