Silanna Semiconductor SZ1110 | Demoboard SZ-RD13-00

Description

This reference design describes a 30 W universal input offline power supply with programmable output voltage (5 V/3 A, 9 V/3 A, 15V/2A, 20 V/1.5 A). The power supply uses SZ1110 (Flyback PWM controller with integrated active clamp circuit) IC and Weltrend WT6633P USB PD controller. This design shows the high-power density and efficiency that can be achieved due to the high level of integration of the SZ1110 controller.This document contains the power supply specification, schematic, bill-of-materials, transformer documentation, printed circuit layout and performance data.

Features

• Integrated High Voltage Active Clamp FET,Active Clamp Driver, and Start-up Regulator
• Capable of Over 93% Efficiency
• Flat Efficiency Across Universal (90-265 VAC)Input Voltage and Load
• Tight Switching Frequency Regulation forImproved Input EMI Filter Utilization
• Up to 140 kHz Switching Frequency Operation
• OptiModeTM Cycle-by-Cycle Adaptive DigitalControl
• Multi-Mode Operation (Burst Mode, Quasi-Resonant, Valley Mode Switching)
• Advanced Valley Mode Switching for low EMI
• Self-Tuning Valley Detection
• OTP, UVLO, OVLO, PCL, OPP and OSCPProtections
• <50mW No Load Power Consumption
• Up to 33W Output Power

Typical applications

• High-Power-Density USB-PD AC/DC Power Supplies

More information

• Datasheet
• IC product information