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Real Examp

This example shows an isolated switched mode power supply in a half bridge configuration. The power controller is on the secondary side while the power MOSFETs that provide the switching power to the transformer are on the primary side. Typically, opto-drivers are used to switch the gates of the power MOSFETs to control the amount of power being delivered. The opto-drivers serve a dual function. They keep the secondary side isolated from the primary and provide the switching current required by the gates of the power MOSFETs to turn them on and off, per the controller signals. The HCPL-3140 is a typical opto-driver commonly used in these applications. The Si826x not only provides all the functionality, but also upgrades the timing characteristics of the HCPL-3140 while being pin compatible to it. The 10x improvement in the feedback loop timing of the isolation and drive paths can be leveraged by the designer to meet more aggressive timing budgets, thereby saving power and increasing efficiency of the power supply.

PTM Published on: 2013-06-18