26 PRODUCT UPDATE Issue 2 2023 Power Electronics Europe www.power-mag.com The eGaN IC-based reference design addresses new USB PD 3.1 stringent demands for multi-port chargers and on-motherboard DC/DC converting a 28 to 48V input to 12 or 20V output. The EPC9177 digitally-controlled, single output synchronous buck converter reference design board operates at 720kHz switching frequency, converting an input voltage of 48, 36 or 28V to a regulated 12V output voltage and delivering up to 20A continuous output current. The compact synchronous buck converter measures 21 x 13mm and a low profile of 3.0mm. It features the EPC23102 integrated half-bridge ePower stage and is optimised for computing power supplies and USB PD 3.1 multiport chargers and on-board DC/DC. In USB PD 3.1 applications, the output voltage for USB charging increases from 20 to 48V and power increases from 100 to 240W. This higher power enables USB charging beyond laptop and cell phone fast charging to higher power applications including gaming PCs, power tools and e-bikes. The main output of chargers is 48V to allow the higher output power with 5.0A rated cables, but multi-port chargers can also support lower output voltages (e.g. 5.0, 12 and 20V) to be compatible with a wider range of devices. A smart DC/DC regulator is required to generate these lower voltages and a DC/DC regulator is required on the end product’s motherboard to convert the input voltage. The EPC23102 GaN power stage integrates the half bridge driver and FETs (100V, 6.6 mΩ RDSon, the level shifter and the bootstrap charging and can switch with very high efficiency up to 3MHz. It enables the EPC9177 reference board to deliver up to 20A continuous current using a heatsink and 15A continuous current without a heatsink to 12V output voltage, with greater than 97.3% efficiency with a 48 V input. The reference design is suitable for high power applications including computing, industrial, consumer and telecomms power systems which require high efficiency but a small size. eGaN FETs and ICs provide the fast switching, high efficiency and small size that can meet the stringent power density requirements of these leading-edge applications, says EPC. The EPC9177 reference design board is available from EPC and available for immediate delivery from Digi-Key. EGaN IC reference design addresses USB PD 3.1 The PESD2CANFD36XX-QA devices are offered in a variety of packages and capacitance classes for commercial vehicle applications. The six AEC-Q101qualified ESD protection devices protect bus lines in automotive in-vehicle networks , for example LIN, CAN, CAN-FD, FlexRay and SENT, from damage caused by ESD and other transients. The increase in data rates increase and electrification within vehicles means that the need for ESD protection is becoming ever more critical, says the company. Lorries, trucks and commercial vehicles typically use 24V board nets, larger than the battery voltage found in cars and smaller vehicles. ESD protection devices with operating voltages typically above 32V are required to safeguard sensitive signal lines in 24V board nets. The ESD devices have been designed to have a maximum reverse standoff voltage of 36V and up to 22kV ESD protection. They also have a low clamping voltage of 48V VCL at IPP of 1.0A for robust in-vehicle networks. The devices are available in SOT23 and SOT323 packages and three low capacitance classes (4.3, 6.0 and 10pF) for smooth communication between interfaces without impacting signal integrity. ESD protection for in-vehicle bus lines are qualified to AEC-Q101 The miniature supercapacitor delivers power density and fast charging in automotive electronic applications, says the company. The FMU supercapacitor series delivers 1,000 hours at 85°C/85% RH-rated voltage and, claims Kemet, has an industry leading operational temperature range from -40°C to 105°C. The supercapacitors are qualified to an automotive testing protocol and manufactured in an ISO TS 16949-certified plant and subjected to PPAP/PSW and change control. Suitable automotive applications are those which require a main power system back-up during a power loss, such as ADAS (advanced driving assistance system), autonomous vehicles and central gateway ECUs (engine control units). Supercapacitors maintain the main power system’s real-time clock or volatile memory when it is removed, such as during a power failure or when the main power system’s battery has been removed for replacement. They also offer power back-up in equipment ranging from IoT devices, smart meters, medical devices and industrial computing. The FMU miniature supercapacitors use a proprietary aqueous electrolyte that provides high durability against liquid leakage, vibrations and thermal shock for reliability in harsh environments. Aqueous electrolytes are highly conductive, have a low environmental impact and are non-toxic and nonflammable. Unlike a battery, supercapacitors store and release energy quickly through physical adsorption and the ions desorption in the electrolyte between its electrodes. The supercapacitor’s low internal resistance means they can fully charge within a few seconds, compared to a secondary battery cell which can take from 10 minutes to several hours to fully charge. Moreover, there is no theoretical limit to the life cycle, whereas a lithium-ion secondary cell has a finite lifetime of about 500 cycles. They also typically have a greater resistance to moisture absorption than organic compounds, for a longer life with better stability, says the company. Kemet is a Yageo Group company. The FMU supercapacitors are available immediately via distributors. Miniature automotive supercapacitor delivers fast charging
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