AN‑120 is a comprehensive application note that provides step‑by‑step guidance for designing high‑performance LLC resonant power supplies using the HiperLCS‑2 chipset from Power Integrations. This downloadable design guide is intended for power‑electronics engineers who want to develop reliable CV/CC battery chargers and AC‑DC power supplies with minimal trial and error.

The document walks through the complete LLC design process—from system specifications and transformer construction to control‑loop compensation and PCB layout—using practical examples and detailed explanations. It is especially useful for designers with limited prior experience in LLC resonant converters, as well as experienced engineers looking to accelerate development and improve first‑pass success.

Key Features

• Real‑world design examples up to 720 W and beyond
• Mathematical derivations paired with measured bench results
• Transformer construction diagrams and winding best practices
• Practical troubleshooting insights for ZVS, hard switching, and ripple issues