This document describes how to reduce the power consumption, under no-load conditions, of battery chargers and adapters by using STMicroelectronics’s TSM family of secondary-side devices. This family of devices provides accurate voltage and current regulation, while incurring very low consumption at no- load conditions. In fact, owing to these innovative, integrated devices, the total power consumption for the entire system at no-load conditions can be reduced down to nearly 100mW. With the arrival of new power consumption regulations, this capability is increasingly sought after.
The document describes methods to lower power dissipation under no-load conditions for SMPS applications, specifically targeting secondary-side circuits. It highlights that traditional designs can consume up to 460mW, whereas optimized designs using specific STMicroelectronics components can achieve consumption as low as 104mW.
| Typical no-load power consumption (optimized) | nearly 100mW |
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A typical system at no-load conditions with a standard configuration consumes approximately 460mW.
Using these components allows for an economy of nearly 80% in power consumption compared to typical solutions.
It is possible to descend to only 104mW in no-load conditions using the TSM1012 and a low-consumption optocoupler.