Silanna Semiconductor SZ1131 | Demoboard SZ-RD31-00

Description

This reference design describes an all-silicon 65 W universal input offline power supply with programmable output voltage (5 V/3 A, 9 V/3 A, 15 V/3 A, 20 V/3.25 A). The power supply uses SZ1131 (Flyback PWM controller with integrated active clamp circuit) IC and Cypress CYPD3174 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 SZ1131 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 94.5% Efficiency
• Flat Efficiency Across Universal (90-265 VAC) Input Voltage and Load
• Tight Switching Frequency Regulation for Improved Input EMI Filter Utilization
• Up to 140 kHz Switching Frequency Operation
• OptiModeTM Cycle-by-Cycle Adaptive Digital Control
• Multi-Mode Operation (Burst Mode, QuasiResonant, Valley Mode Switching)
• Advanced Valley Mode Switching for Low EMI
• Self-Tuning Valley Detection
• OTP, UVLO, OVLO, PCL, OPP and OSCP Protections
• < 20mW No Load Power Consumption
• Up to 65 W Output Power for Universal Input
• 100W+ Output Power with Front-End PFC

Typical applications

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

More information

• Datasheet
• IC product information