RD23 33W USB PD REPORT

PublishTime：2022-01-18

This reference design describes a 33W universal input offline power supply with programmable output voltage (5V/3A, 9V/3A,15V/2.2A,20V/1.65 A). The power supply uses SZ1131 (Flyback PWM controller with integrated active clamp circuit) IC and CypressCYPD3174USB 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.
●SZ1131 Features
■Integrated High Voltage Active Clamp FET, Active Clamp Driver, and Start-up Regulator
■Capable of Over 93.5% Efficiency
■Flat Efficiency Across Universal (90-265 VAC) Input Voltage and Load
■Tight Switching Frequency Regulation for Improved Input EMI Filter Utilization
■Up to 140kHz Switching Frequency Operation
■OptiMode™Cycle-by-Cycle Adaptive Digital Control
■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 OSCP Protections
■<20mW No Load Power Consumption
■Up to 33W Output Power

Brand of Product：	Silanna Semiconductor
Part#：	RD-23 、 SZ1131 、 CYPD3174 、 RD23 More Part#
Product Category：	Flyback PWM controller 、 USB PD controller More
Application：	[ High-Power-Density USB-PD AC/DC Power Supplies ] More
Data Type：	Application note & Design Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	2021/12/19
Version Number：	Ver.1.1
Data Encoding：	11100
Data Size：	7 MB

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Integrated Circuits