Spread spectrum switching in DC-DC buck converters simplifies board design

January 21, 2019 //By Nick Flaherty
Spread spectrum switching in DC-DC buck converters simplifies board design
Diodes has launches a series of 2A synchronous DC-DC buck converters with reduced EMI across a range of input and output voltages by using a frequency spread spectrum (FSS) technique.

THis can reduce the cost of the board design and means the AP63200/1/3/5 are aimed at cost sensitive home appliances and industrial electronics, as well as telecommunications, power tools, office equipment and consumer products such as TVs and set top boxes. 

Switching DC-DC converters can typically introduce significant EMI to a design. By using a frequency jitter of ±6% and proprietary gate driver technology, the devices provide best-in-class EMI performance. This allows designs to use a lower cost single layer PCB by removing the need for vias to further reduce EMI. Further improvements are achieved through the proprietary gate driver design, which reduces switching node ringing without sacrificing the MOSFET turn-on and turn-off times.

The fully integrated devices feature high-side and low-side MOSFETs with very low on-resistance, RDS(ON) by using Diodes’ proprietary gate driver technology and compensation network. By employing pulse frequency modulation (PFM), the AP63200/AP63201/AP63203/AP63205 have efficiencies of up to 88% under light-load conditions (5mA output current), and a low quiescent current of 22µA. 

The wide input voltage range of between 3.8V to 32V supports a variable output voltage of between 0.8V to VIN (AP63200/AP63201), or fixed output voltages of 3.3V (AP63203) or 5V (AP63205). All devices can deliver a maximum continuous output current of 2A. The AP63200/AP63201 devices can also operate as an LDO regulator by employing a duty cycle of 100%, providing a stable output voltage to within 1% of an unregulated input voltage. All of the devices have been designed to withstand input voltage surges of up to 40V for 400ms. 

All the devices are available in the TSOT26 package and priced at $0.60 each in 1000 piece quantities.

www.diodes.com


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