Highest Power Density for Regulated DC-DC Converters Achieved Using EPC GaN FETs and Analog Devices Controller, Efficiency Greater than 96.5 %

时间： 2023-05-06 来源：EPC News

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EL SEGUNDO, Calif.— July 2022 — EPC announces the availability of the EPC9158, a dual output synchronous buck converter reference design board operating at 500kHz switching frequency that converts an input voltage of 48V - 54V to a regulated 12V output and delivers up to 25A per phase or 50A total continuous current. The combination of the new Analog LTC7890 synchronous GaN buck controller with ultra-efficient GaN FETs from EPC enables a highly efficient solution in a small footprint for high power density applications. The solution achieves 96.5% efficiency at 48V to 12V and 50A continuous current.

The high-power density makes this solution ideal for computing, industrial, consumer, and telecom power systems requiring small size and high efficiency. eGaN® FETs provide fast switching, high efficiency, and small size that can meet the stringent power density requirements of these leading-edge applications.

The EPC9158 reference design uses the EPC2218 100V enhancement-mode GaN FET and the LTC7890 two-phase analog buck controller with integrated GaN drivers.

The LTC7890 100 V low Iq, the dual, 2-phase synchronous step-down controller is fully optimized to drive EPC GaN FETs and integrates a half-bridge driver and smart bootstrap diode. It offers optimized near-zero deadtime or programmable deadtime and programmable switching frequencies up to 3 MHz. The quiescent current of 5 uA (V_IN = 48V, V_OUT = 5V, CH1 only) enables very low standby power consumption and excellent light load efficiency.
The EPC2218 is a 100V GaN FET with 3.2mOhm max R_DS(on), 10.5nC Q_G, 1.5nC Q_GD, 46nC Q_OSS, and zero Q_RR in a super small 3.5mm x 1.95mm footprint and can deliver up to 60A continuous current and 231A peak current. The excellent dynamic parameters allow very small switching losses at 500kHz switching frequency.

The efficiency of the EPC9158 is greater than 96.5% for 12V output and 48V input. In addition to light load operating mode and adjustable dead time, the board offers UVLO, Over-current protection, and power good output.

Alex Lidow, CEO of EPC commented, “GaN FETs are required to achieve the maxim power density for DC-DC converters. We are delighted to work with Analog Devices to combine the benefits of their advanced controllers with the performance of GaN to provide customers with the highest power density and low component count solution that increases the efficiency, increases power density, and reduces system cost.”

“The Analog Device’s LTC7890 is designed to fully exploit the high performance of EPC’s eGaN FETs for high power density solutions,” said Tae Han, Sr. Product Marketing Manager at Analog Devices, “The LTC7890 offers higher switching frequency and optimized deadtime that competes well above the current solution in the market while operating in very lower power consumption. With these new controllers, customers can take advantage of the very fast switching of GaN for the highest power density.”

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本文由玄子转载自EPC News，原文标题为:Highest Power Density for Regulated DC-DC Converters Achieved Using EPC GaN FETs and Analog Devices Controller，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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工业应用手册

描述- 罗姆半导体集团提供高品质、高可靠性的工业设备元器件，通过垂直统合型生产体制确保稳定供应。公司专注于功率半导体和模拟半导体，开发节能、小型化、安全的产品，涵盖工厂自动化、能源和基础设施等领域。罗姆提供丰富的产品线，包括功率半导体、模拟半导体、传感器、无源元器件等，并支持客户设计，提供设计模型、参考设计和应用笔记。

型号- BD52W04G-C,BD900N1W,BM2SCQ123T-LBZ,R6007RND3,CSL1901 系列,BD900N1G-C,BD2311NVX-C,RBR2VWM60A,BD933N1,BD1421XG-LA 系列,RBR1VWM40A,BM2SC12XFP2-LBZ,CSL1901,BP3622,BD14210G-LA,BP3621,SCT4013DW7,R6035VNX3,RB068VWM150,R60XXYNX 系列,BD1421X-LA 系列,CSL1901DW,QH8KXX 系列,BD950N1WG-C,BM2LE160FJ-C,BM2P060LF-Z,BV1LE080EFJ-C,BM2SC123FP2-LBZ,SH8MC5,REFPDT007-EVK-001,BD1421XG-LA,SCT4018KW7,RB168VWM-40,RFS 系列,BD9XXN1 系列,SCT4018KE,BD52W03G-C,SCT4026DE,BM2SCQ121T-LBZ,RB168VWM-60,BD48W00G-C,RBR1VWM30A,SH8MB5,SCT4018KR,SCT4026DR,R6035VNX,BM2P061MF-Z,BM6437X,CSL1901UW,BM64378S-VA,BD900N1EFJ-C,SCT4013DE,BM2P063MF-Z,R6024VNX3,SCT4013DR,BD7XXL05G-C,BD950N1,RB068VWM100,RFL,R60XXYNX,SH8KXX,CSL1901VW,RFS,BD14215FVJ-LA,BM2SC12XFP2-LBZ 系列,PSR,RB168VWM-30,SCT4036KW7,R6004RND3,BM2LE040FJ-C,RF05VAM2S,BD750L05G-C,BM2SC122FP2-LBZ,BD900N1,BD933N1G-C,BM2P061LF-Z,BD52W02G-C,SH8KXX 系列,BM64377S-VA,BD933N1EFJ-C,BD950N1EFJ-C,QH8MB5,REFLD002,R60XXRNX,SH8MX5 系列,RBLQ2VWM10,PSR500,SCT3017AL,BD1421XFVJ-LA,SCT4026DW7,BV1LE040EFJ-C,RFS30TZ6S,BD900N1WG-C,BD9S402MUF-C,QH8MC5,CSL1901YW,BV1LEXXXEFJ-C,RFL60TZ6S,RFL 系列,R6013VND3,BM2P06XMF-Z 系列,R6009RND3,R6077VNZ,BM6437X 系列,BM2SCQ122T-LBZ,RFL60TS6D,S WAVE B-01,PSR400,RFS30TS6P,BD933N1WG-C,BD52W01G-C,RB068VWM-60,R WAVE B-01,BD9F500QUZ,RLD90QZWX 系列,REFPDT007-EVK-001B,REFPDT007-EVK-001A,R60XXVNX 系列,REFPDT007-EVK-001C,LTR10,BD950N1WEFJ-C,SCT3030AL,BM2SC124FP2-LBZ,QH8MX5 系列,QH8KB5,R6013VNX,QH8KB6,RBR2VWM30A,BM2LE250FJ-C,BD2311NVX-LB,RGW00TS65CHR,BM2LEXXXFJ-C 系列,RFK 系列,SCT4045DW7,BV1LE250EFJ-C,SCT4036KE,QH8MX5,SCT4045DE,R6024VNX,BM2SCQ124T-LBZ,R60XXRNX 系列,R6055VNX,R6018VNX,R6055VNZ,SCT4045DR,RGW80TS65CHR,REFPDT007,QH8KC6,CSL1901MW,QH8KC5,RB168VWM150,R60A4VNZ4,BD52W06G-C,SCT4062KR,BD1421XFVJ-LA 系列,BD48HW0G-C,BM2P06XMF-Z,RBR2VWM40A,BD9XXN1,R6077VNZ4,RGWXX65C,BM1390GLV-Z,RBR1VWM60A,REFLD002-1,QH8KXX,REFLD002-2,R6055VNX3,BD52W05G-C,SCT4036KR,RFL30TS6D,BM2LEXXXFJ-C,BD900N1WEFJ-C,RLD90QZWX,BD7XXL05G-C 系列,RFS60TS6D,BD733L05G-C,BD933N1WEFJ-C,BD9G500EFJ-LA,SCT4062KE,GNE1040TB,LTR10 系列,BM64374S-VA,BD950N1W,BD725L05G-C,BD933N1W,BD730L05G-C,BM2SC121FP2-LBZ,PSR350,BD8758XYX-C,SH8KC6,BV1LEXXXEFJ-C 系列,BM64375S-VA,SH8KC7,BM2LE080FJ-C,SH8MX5,SCT4062KW7,R60XXVNX,PSR100,RB168VWM100,BD950N1G-C,RGW60TS65CHR,RGWXX65C 系列,R6055VNZ4,BM2P060MF-Z,RLD90QZWJ,RFS60TZ6S,RLD90QZWD,RLD90QZWC,SH8KB7,RLD90QZWB,RB068VWM-40,SH8KB6,RLD90QZWA,RLD90QZW8,RB068VWM-30,BV1LE160EFJ-C,RFL30TZ6S,RLD90QZW5,PSR系列,BD1421X-LA,PSR330,RLD90QZW3

11.2023 - ROHM - 应用笔记或设计指南 - Ver. 3.1 代理服务技术支持采购服务

工业应用手册

型号- BD52W04G-C,SH8KXX SERIES,R6009RND3,BD900N1W,QH8KXX SERIES,R6077VNZ,LTR100L,BM2SCQ123T-LBZ,R6007RND3,BM2SCQ122T-LBZ,BD900N1G-C,RFL60TS6D,LTRL SERIES,RBR2VWM60A,BD9XXN1 SERIES,BD933N1,RFS SERIES,RBR1VWM40A,BD933N1WG-C,BM2SC12XFP2-LBZ,BD52W01G-C,LTR18,MCR10L,CSL1901,RB068VWM-60,BP3622,BP3621,BD14210G-LA,SCT4013DW7,BM2P06XMF-LBZ,R6035VNX3,RB068VWM150,MCR18L,R60XXRNX SERIES,RFS30TS6D,BD950N1WEFJ-C,CSL1901DW,BD950N1WG-C,BM2LE160FJ-C,BM2P060LF-Z,BM2SC124FP2-LBZ,BV1LE080EFJ-C,QH8MX5 SERIES,BM2SC123FP2-LBZ,SH8MC5,SCT4018KW7,RB168VWM-40,QH8KB5,R6013VNX,QH8KB6,RGWXX65C SERIES,RBR2VWM30A,BM2LE250FJ-C,RGW00TS65CHR,RFL SERIES,SH8MX5 SERIES,SCT4045DW7,BV1LE250EFJ-C,SCT4036KE,SCT4018KE,QH8MX5,SCT4045DE,R6024VNX,BM2SCQ124T-LBZ,BD52W03G-C,SCT4026DE,BM2SCQ121T-LBZ,R6055VNX,RB168VWM-60,BD48W00G-C,R6018VNX,R6055VNZ,SCT4045DR,RBR1VWM30A,SH8MB5,SCT4018KR,RGW80TS65CHR,SCT4026DR,R6035VNX,MCRL,CSL1901MW,QH8KC6,LTR10L,QH8KC5,RB168VWM150,R60A4VNZ4,BD7XXL05G-C SERIES,BM2P061MF-Z,BD52W06G-C,BM6437X,CSL1901UW,BM64378S-VA,SCT4062KR,BD900N1EFJ-C,SCT4013DE,BM2P063MF-Z,R6024VNX3,SCT4013DR,LTR100,BD7XXL05G-C,R60XXVNX SERIES,BD950N1,BD48HW0G-C,RB068VWM100,RBR2VWM40A,BD1421X-LA SERIES,RFL,BD9XXN1,SH8KXX,CSL1901VW,RFS,R6077VNZ4,RGWXX65C,BM1390GLV-Z,RBR1VWM60A,BD14215FVJ-LA,BM6437X SERIES,QH8KXX,BD52W05G-C,R6055VNX3,LTR SERIES,BM2P06XMF-LBZ SERIES,SCT4036KR,RFL30TS6D,BM2LEXXXFJ-C,BD900N1WEFJ-C,RFS60TS6D,BD733L05G-C,LTR50,BD933N1WEFJ-C,SCT4062KE,RB168VWM-30,SCT4036KW7,BM2SC12XFP2-LBZ SERIES,BM64374S-VA,BD950N1W,BD725L05G-C,BM2LE040FJ-C,R6004RND3,BD933N1W,BD730L05G-C,BD750L05G-C,BM2SC121FP2-LBZ,BM2SC122FP2-LBZ,BD900N1,BD933N1G-C,BM2P061LF-Z,BD52W02G-C,SH8KC6,LTR,BM64375S-VA,SH8KC7,BM64377S-VA,BD933N1EFJ-C,BD950N1EFJ-C,BM2LE080FJ-C,SH8MX5,QH8MB5,SCT4062KW7,MCRL SERIES,R60XXVNX,BV1LEXXXEFJ-C SERIES,RB168VWM100,R60XXRNX,RBLQ2VWM10,BD950N1G-C,LTRL,SCT4026DW7,RGW60TS65CHR,BV1LE040EFJ-C,R6055VNZ4,BM2P060MF-Z,RFS60TZ6S,RFS30TZ6S,BD900N1WG-C,CSL1901 SERIES,SH8KB7,RB068VWM-40,SH8KB6,RB068VWM-30,BV1LE160EFJ-C,RFL30TZ6S,BM2LEXXXFJ-C SERIES,QH8MC5,CSL1901YW,BD1421X-LA,BV1LEXXXEFJ-C,RFL60TZ6S,R6013VND3

06.2023 - ROHM - 商品及供应商介绍 - Ver. 3.0 代理服务技术支持采购服务

增强型氮化镓技术

描述- 本文介绍了eGaN®技术，这是一种基于氮化镓（GaN）的功率转换技术。与传统硅基功率器件相比，eGaN®器件具有更快的开关速度、更小的尺寸、更高的效率和更低的成本。文章详细阐述了eGaN®技术的优势，包括降低导通电阻、提高开关速度、减少电容和降低驱动电路所需的功率。此外，还介绍了eGaN®器件在汽车、医疗、LED照明、无线充电和太阳能等领域的应用。

型号- EPC2212,N/A,EPC2214,EPC2059,EPC2216,EPC2215,EPC2218,EPC2050,EPC9126,EPC2052,EPC2051,EPC2054,EPC2053,EPC2055,EPC9086,EPC2218A,EPC90153,EPC2102,EPC2101,EPC2104,EPC2103,EPC2106,EPC2105,EPC2107,EPC2065,EPC90151,EPC90152,EPC2100,EPC2067,EPC21701,EPC2221,EPC2066,EPC90150,EPC9097,EPC90145,EPC90142,EPC9098,EPC90143,EPC9099,EPC9092,EPC90148,EPC90149,EPC90146,EPC9094,EPC90147,EPC2219,EPC9091,EPC2619,EPC2036,EPC2035,EPC2038,EPC2037,EPC2014C,EPC9507,EPC2031,EPC2152,EPC9063,EPC9126HC,EPC2204A,EPC9061,EPC2308,EPC2307,EPC9005C,UP1966E,EPC2203,EPC9004C,EPC2204,EPC2207,EPC2206,EPC2044,EPC2012C,EPC9049,EPC2252,EPC9166,EPC9167,EPC9041,EPC9162,EPC9165,EPC7020,EPC9160,EPC9040,EPC2302,EPC2001C,EPC2304,EPC2306,EPC2305,EPC8002,EPC9177,EPC9167HC,EPC9179,EPC9173,EPC9174,EPC9055,EPC9050,EPC9171,EPC9172,EPC7007,EPC2034C,EPC7002,EPC9148,EPC23101,EPC2071,EPC7001,EPC23102,EPC23103,EPC9144,EPC23104,EPC90140,EPC2111,EPC7004,EPC7003,EPC90132,EPC9022,EPC90137,EPC90138,EPC90135,EPC7019,EPC7018,EPC9038,EPC9039,EPC21603,EPC9156,EPC9036,EPC9157,EPC9037,EPC21601,EPC2088,EPC7014,EPC90122,EPC90123,EPC90120,EPC9153,EPC90121,EPC9154,EPC90124,EPC9150,EPC90128

2023/7/11 - EPC - 商品及供应商介绍代理服务技术支持采购服务查看更多版本

增强型氮化镓技术

描述- 该资料介绍了eGaN®技术，一种基于氮化镓（GaN）的功率转换技术。相比硅基器件，eGaN®器件具有更快的开关速度、更小的尺寸、更高的效率和更低的成本。资料详细阐述了eGaN®器件的优势，包括降低导通电阻、减少开关损耗、降低电容和驱动电路所需的功率。此外，还介绍了eGaN®技术的可靠性、成本效益和广泛的应用领域，如汽车、无线电源、医疗设备等。

型号- EPC2212,EPC950X,EPC2214,EPC2059,EPC9003C,EPC2216,EPC2215,EPC2218,EPC2016C,EPC2050,EPC9126,EPC9127,EPC2052,EPC9128,EPC2051,EPC9129,EPC2054,EPC2053,EPC2055,EPC9086,EPC2218A,EPC90153,EPC9121,EPC2069,EPC2102,EPC9002C,EPC2101,EPC2104,EPC2103,EPC2106,EPC2105,EPC2108,EPC2107,EPC9137,EPC2065,EPC2100,EPC2067,EPC2221,EPC9014,EPC21701,EPC2066,EPC90150,EPC9097,EPC90145,EPC90142,EPC9098,EPC90143,EPC9099,EPC9092,EPC90148,EPC90149,EPC9093,EPC90146,EPC9094,EPC90147,EPC2219,EPC9091,EPC2619,EPC2036,EPC2035,EPC2038,EPC2037,EPC2014C,EPC2039,EPC9507,EPC2030,EPC9067,EPC2032,EPC2031,EPC9068,EPC2152,EPC2034,EPC2033,EPC9063,EPC9126HC,EPC9064,EPC9066,EPC8010,EPC2204A,EPC9060,EPC9061,EPC9062,EPC2308,EPC2307,EPC9005C,UP1966E,EPC2203,EPC9004C,EPC2202,EPC9515,EPC2204,EPC2015C,EPC2207,EPC2206,EPC9115,EPC9513,EPC2040,EPC9514,EPC9078,EPC9111,EPC9112,EPC2045,EPC2044,EPC2012C,EPC2019,EPC9049,EPC9166,EPC9046,EPC9167,EPC9047,EPC9048,EPC9041,EPC9162,EPC9163,EPC9165,EPC9160,EPC9040,EPC2024,EPC8009,EPC2302,EPC2001C,EPC2029,EPC2304,EPC2306,EPC2305,EPC9010C,EPC8002,EPC2021,EPC2020,EPC9057,EPC9167HC,EPC2023,EPC9058,EPC8004,EPC2022,EPC9173,EPC9055,EPC9176,EPC9170,EPC9050,EPC9171,EPC9172,EPC9006C,EPC9001C,EPC2010C,EPC7007,EPC2034C,EPC9148,EPC2071,EPC23101,EPC23102,EPC9144,EPC90140,EPC2111,EPC7004,EPC9146,EPC2110,EPC90132,EPC9022,EPC9143,EPC90137,EPC90138,EPC90139,EPC7019,EPC9048C,EPC7018,EPC9038,EPC9039,EPC2007C,EPC9034,EPC9035,EPC21603,EPC9156,EPC9036,EPC9157,EPC7014,EPC9037,EPC2088,EPC21601,EPC90122,EPC9151,EPC9031,EPC90123,EPC9032,EPC90120,EPC9153,EPC9033,EPC90121,EPC9154,EPC90124,EPC9150,EPC90128

2023/1/10 - EPC - 商品及供应商介绍代理服务技术支持采购服务

增强型氮化镓技术

描述- 本文介绍了增强型氮化镓（eGaN）技术及其在功率转换中的应用。文章强调了eGaN器件相比硅基器件的优势，包括更快的开关速度、更小的尺寸、更高的效率和更低的生产成本。此外，还提到了eGaN技术的可靠性和设计支持。

型号- EPC2212,EPC950X,EPC2214,EPC2059,EPC9003C,EPC2216,EPC2215,EPC2218,EPC2016C,EPC2050,EPC9126,EPC9127,EPC2052,EPC9128,EPC2051,EPC9129,EPC2054,EPC2053,EPC2055,EPC9086,EPC9121,EPC2069,EPC2102,EPC9002C,EPC2101,EPC2104,EPC2103,EPC2106,EPC2105,EPC2108,EPC2107,EPC9137,EPC2065,EPC2100,EPC2067,EPC9014,EPC2221,EPC2066,EPC9097,EPC90145,EPC90142,EPC9098,EPC9099,EPC9092,EPC90148,EPC90149,EPC9093,EPC90146,EPC9094,EPC90147,EPC2219,EPC9091,EPC2036,EPC2035,EPC2038,EPC2037,EPC2014C,EPC2039,EPC9507,EPC2030,EPC2032,EPC2152,EPC2031,EPC2034,EPC2033,EPC9063,EPC9126HC,EPC9064,EPC8010,EPC9060,EPC9061,EPC9062,EPC2308,EPC9005C,UP1966E,EPC2203,EPC9004C,EPC2202,EPC9515,EPC2204,EPC2015C,EPC2207,EPC2206,EPC9115,EPC9513,EPC2040,EPC9514,EPC9078,EPC9111,EPC9112,EPC2045,EPC2044,EPC2012C,EPC2019,EPC9049,EPC9166,EPC9046,EPC9167,EPC9047,EPC9048,EPC9041,EPC9162,EPC9163,EPC9165,EPC9160,EPC9040,EPC2024,EPC8009,EPC2302,EPC2001C,EPC2029,EPC2306,EPC9010C,EPC8002,EPC2021,EPC2020,EPC9057,EPC9167HC,EPC2023,EPC9058,EPC8004,EPC2022,EPC9173,EPC9055,EPC9176,EPC9170,EPC9050,EPC9171,EPC9006C,EPC9001C,EPC2010C,EPC7007,EPC2034C,EPC9148,EPC2071,EPC23101,EPC9029,EPC23102,EPC9144,EPC9024,EPC2111,EPC7004,EPC9146,EPC2110,EPC90132,EPC9022,EPC9143,EPC90137,EPC90138,EPC90139,EPC7019,EPC9048C,EPC7018,EPC9038,EPC9039,EPC2007C,EPC9034,EPC9035,EPC21603,EPC9156,EPC9036,EPC9157,EPC7014,EPC9037,EPC21601,EPC90122,EPC9030,EPC9151,EPC9031,EPC90123,EPC9032,EPC90120,EPC9153,EPC9033,EPC90121,EPC9154,EPC90124,EPC9150,EPC90128

October, 2022 - EPC - 数据手册代理服务技术支持采购服务

BRC Solar Selects EPC 100V eGaN FETs for Next Generation Solar Optimizer

Designing EPC‘s EPC2218 100V FETs into BRC Solar GmbH‘s next generation M500/14 power optimizer has enabled a higher current density due to the low power dissipation and the small size of the GaN FET making the critical load circuit more compact.

2022-08-26 - 应用方案代理服务技术支持采购服务

RC65D270E氮化镓650V氮化镓高电子迁移率晶体管

描述- RC65D270E系列650V、270mΩ氮化镓(GaN)FET是常关型器件，通过降低栅极电荷、提高开关速度和降低动态导通电阻，提供更高的效率。该系列器件适用于汽车、可再生能源、电信和数据通信、伺服电机和工业等领域。

型号- RC65D270E SERIES,RC65D270E

2024/7/17 - 正芯 - 数据手册代理服务技术支持采购服务

CE65H270TOEI氮化镓650V氮化镓高电子迁移率晶体管数据表

描述- 该资料介绍了Corenergy公司生产的CE65H270TOEI系列650V GaN HEMT器件。这些GaN FETs具有低栅极电荷、快速开关速度和低动态导通电阻等特点，相比传统硅器件在效率、功率密度和系统尺寸与重量方面提供显著优势。

型号- CE65H270TOEI SERIES,CE65H270TOEI

2023-12-25 - CORENERGY - 数据手册 - REV.3.0 代理服务技术支持采购服务

Intellectual Power Amplifier Module Based on GaN FETs

To simplify and accelerate the development process of many devices (D-class audio amplifiers, AC current and voltage calibrators, power supply modulators etc.), the idea of creating an Intellectual Power Amplifier Module (IPAM) appeared. IPAM is a fully differential pulsing power amplifier covered by a common negative feedback. The module contains small FPGA chip. The development of the output choke has turned into a separate R＆D work related to the need to study the parameters of the newest high-frequency power ferrites manufactured by TDK/Epcos and Ferroxcube.

2021-05-24 - 原厂动态代理服务技术支持采购服务

USB功率传输的进步：氮化镓技术的效率和高功率密度

描述- 本文探讨了USB技术，特别是USB Power Delivery (USB PD) 3.1规范的演变，以及GaN技术在提高功率传输效率和密度中的作用。文章强调了现代电子设备日益增长的功率需求带来的挑战，并说明了GaN技术如何解决这些挑战。文章以EPC9195为例，展示了高功率密度USB PD充电器的设计，强调了GaN晶体管和模拟控制器在实现高效率和紧凑性方面的优势。实验结果证明了该设计的性能和效率，使其成为需要USB PD 3.1兼容性的下一代电子设备的理想解决方案。

型号- EPC9195,EPC2619,LTC7891

May 2024 - EPC - 技术文档代理服务技术支持采购服务