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Oct 05, 2023

The SZDL3105BB-EVB02 buck converter design example is configured for a 5 V to 20V at5 A output and integrates all necessary connections to properly test and evaluate the efficiency of the Silanna SZDL3105B DC-DC converter. A range of compatible daughter boards ensures rapid configuration of a variety of USB-PD and QC charging use cases.

The SZDL3105BB-EVB02 is pre-configured for operation with inputs from 7.5 V to 24 V and can be used as a general-purpose point of load (POL) application or in-circuit with a USB port controller. Available daughterboards feature the Weltrend WT6633P controller for Qualcomm QC2/3/4 charging and USB-PD, Power Integrations CHY103 for Qualcomm QC3 and the Cypress CYPD3175 for Qualcomm QC4 and USB-PD.

“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.”

The DC-DC converter operates at 667 kHz with a programmable switching frequency up to 2 MHz and measures just 4 mm x 4mm with a 5A, 100 W output. The device accommodates inputs up to 27 VDC and the low operating power dissipation enables the very low no-load power that is an important specification for regulatory certification with 95% efficiency.

Internal and external feedback resistor divider flexibility supports custom design, while a momentary internal feedback path allows for clean and well-controlled start-up operation until external USB port controllers can bias themselves and smoothly take over control of the output voltage.