Infineon Technologies ICE5GR4780AG | Demoboard DEMO_5GR4780AG_14W1

Description

This document is an engineering report for a 14 W 15 V 5 V demo board designed in an FF non-isolated Flyback converter topology with primary-side feedback (FB) using the fifth-generation FF CoolSETTM ICE5GR4780AG. The demo board is operated in Discontinuous Conduction Mode (DCM) and is running at 125 kHz fixed switching frequency. The frequency reduction with soft gate driving and frequency jittering offers lower EMI and better efficiency between medium load and 50% load. The selectable Active Burst Mode (ABM) power enables ultra-low power consumption. In addition, numerous adjustable protection functions have been implemented in ICE5GR4780AG to protect the system and customize the IC for the chosen application. In case of failure modes like line Over Voltage (OV), VCC OV/Under Voltage (UV), open control-loop or over-load, over-temperature, VCC short-to-GND and CS short-to-GND, the device enters protection mode. By means of the cycle-by-cycle Peak Current Limitation (PCL), the dimensions of the transformer and the current rating of the secondary diode can both be optimized. In this way, a cost-effective solution can easily be achieved. The target applications of ICE5GR4780AG are either auxiliary power supplies for white goods, PCs, servers and TVs, or enclosed adapters for Blu-ray players, set-top boxes, games consoles, etc.

Features

• Flyback topology with dual non-isolated output
• 125kHz switching frequency with discontinuous current mode design
• Wide-range input from 85~300VAC with line over-voltage protection at 320VAC
• Output #1: 15V/0.83A
• Output #2: 5V/0.4A

Typical applications

• Offline SMPS, adapter, main power for set-top-box, water/air purifier and TV, auxiliary power for air conditioning, refrigerator, server, PC power and audio

More information

• Datasheet
• IC product information