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Overview
| Topology | Flyback Converter |
| Input voltage | 90-265 V |
| Output 1 | 9 V / 3 A |
| Output 2 | 20 V / 1.5 A |
| Output 3 | 5 V / 3 A |
| Output 4 | 15 V / 2 A |
| IC revision | 1.1 |
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