DC/DC buck converters boast best-in-class EMI performance
Four 2A, synchronous DC/DC buck converters have been announced by Diodes. The AP63200, AP63201, AP63203 and AP63205 are claimed to deliver class-leading EMI performance across a range of input and output voltages. All four are suitable for use in applications as varied as home appliances and industrial electronics, as well as telecommunications, power tools, office equipment and consumer products such as TVs and STBs.
Switching DC/DC converters can typically introduce significant EMI to a design. However, the AP63200, AP63201, AP63203 and AP63205 employ a frequency spread spectrum (FSS) technique with a switching frequency jitter of ± six per cent and proprietary gate driver technology to enable the industry’s best-in-class EMI performance, says Diodes. The design supports single layer PCB and can remove the need for vias to further reduce EMI. The proprietary gate driver design reduces switching node ringing without sacrificing MOSFET turn-on and turn-off times, adds Diodes.
The integrated devices feature high-side and low-side MOSFETs with very low on-resistance, RDS(ON), complemented by Diodes’ proprietary gate driver technology and compensation network. By employing pulse frequency modulation (PFM), the AP63200, AP63201, AP63203 and AP63205 deliver excellent efficiencies of up to 88 per cent under light-load conditions (5mA output current), and a quiescent current as low as 22 microA.
The wide input voltage range of between 3.8 to 32V supports a variable output voltage of between 0.8V to VIN (AP63200 and AP63201), or fixed output voltages of 3.3V (AP63203) or 5.0V (AP63205). All four DC/DC converters can deliver a maximum continuous output current of 2A. The AP63200 and AP63201 devices can also operate as an LDO regulator by employing a duty cycle of 100 per cent, providing a stable output voltage to within one per cent of an unregulated input voltage. All of the devices have been designed to withstand input voltage surges of up to 40V for 400ms.
All products are available in the TSOT26 package.
