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Alternating-output PWM controller

SG3525A Basic Circuit

Build a basic SG3525A circuit with labeled pins, component values and connection guidance.

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SG3525A in a circuit

A 12 V bench circuit with a shutdown pushbutton.

Physical SG3525AN with RT CT RD network, soft-start capacitor, defined inputs, reference divider, shutdown switch and two scope channels.
Matching node labels connect; all grounds are common. Readings and waveforms are illustrative.

Connect it, step by step

Follow the component values and pin connections

Connect the timing network

CT connects to ground. RD connects CT5 to DISCHARGE7, and RT6 uses its own resistor to ground.

Watch startup

The 1 µF capacitor charges at the internal soft-start current, gradually allowing output pulses.

Press shutdown

The button drives pin 10 HIGH. Holding it discharges soft start; releasing it allows a fresh startup.

Component view