The Analog Devices Inc. DC3103A Demonstration Board features a pre-installed LT3942 in a QFN-28 package. The Demonstration Board provides an example application circuit with an output voltage set to 12V with the capability of delivering up to 1A when the input voltage is between 7V and 36V. The Demonstration Board continues operating with an input voltage as low as 3V with reduced output power capability. DC3103A is pre-configured for a 2MHz switching frequency with Spread Spectrum Frequency Modulation (SSFM) disabled. When enabled, SSFM adjusts the switching frequency of the LT3942 between 2MHz and 2.5MHz for improved EMI performance.
The board is designed with ceramic capacitors placed near the PVIN and PVOUT pins to form a compact high-frequency hot loop. SMD pads are available to install an optional ferrite bead EMI filter on both the input and output of DC3103A. These filters, combined with proper board layout and SSFM, effectively reduce both radiated and conducted EMI.