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Buck converters support fast-changing loads

Posted: 28 Apr 2014     Print Version  Bookmark and Share

Keywords:Diodes  buck converter  algorithm  transient response 

Diodes Inc. has released what it says is a synchronous buck converter intended to optimise transient response in low-voltage TV and monitor applications. Based on an adaptive constant on-time control algorithm, the 5A-rated AP65550 quickly reacts to rapid changes in load conditions, guaranteeing a minimal drop in output voltage, noted the company.

Managing wide variations in input/output voltage ratios, the device control algorithm also helps minimise external component count and enables the use of both low and ultra-low equivalent series resistance capacitors. The converter is available in the SO-8EP package and suitable for 5V, 9V and 12V bus systems, due to its stable 4.5-18V operating voltage range.


The buck converter's automatic light-load efficiency-improvement feature ensures seamless transition between continuous conduction mode at higher loads and discontinuous conduction mode at lighter loads. This helps designers comply with low power consumption regulations and achieves operating efficiencies as high as 92 per cent.

To protect downstream components from damage and premature aging, the converter integrates a complete suite of protection features, including undervoltage lockout, thermal shutdown, over-current protection and programmable soft-start.

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