High-efficiency DC-DC converter evaluation board for 100W fast charger designs

14-08-2023 | Silanna Semiconductor | Power

Silanna Semiconductor offers an evaluation board to enable engineers to quickly build and test 100W end-to-end fast charger applications built around the company’s CO2 Smart Power family of wide-voltage, high-frequency POL converters.

The SZDL3105BB-EVB02 buck converter design example is configured for a 5V to 20V at5A output and incorporates all essential connections to properly test and evaluate the efficiency and other performance metrics of the Silanna SZDL3105B fully-integrated DC-DC converter. A range of compatible daughter boards ensures rapid configuration of various USB-PD and QC charging use cases.

The solution, pre-configured for operation with inputs from 7.5V to 24V, may be evaluated as a general-purpose POL application or in-circuit with a USB port controller. Available daughterboards offer Weltrend WT6633P (Qualcomm QC2/3/4, USB-PD), Power Integrations CHY103 (Qualcomm QC3) and Cypress CYPD3175 (Qualcomm QC4, USB-PD) controllers.

“OEMs are looking to develop the smallest, lightest, high-power USB-PD and QC fast chargers within tight time-to-market deadlines,” says Ahsan Zaman, Silanna Semiconductor’s director of product marketing. “By speed the evaluation of our industry-leading buck converters in a variety of different scenarios this evaluation board and the associated daughter boards help to reduce the time from design and prototyping to final production.”

Operating at a switching speed of 667kHz, the converter measures just 4mm x 4mm yet provides up to 5A and 100W. The device accommodates inputs up to 27VDC and features an extremely low operating power dissipation that enables low no-load power, an important specification for regulatory certification. Internal and external feedback resistor divider flexibility supports the custom design, while a momentary internal feedback path permits clean and well-controlled start-up operation until external USB port controllers can bias themselves and smoothly control the output voltage.

Applications include USB-PD and QC2/3/4 DC-DC Converters.

By Seb Springall