SiC MOSFET低边开关导通时的Gate-Source间电压的动作

时间： 2024-07-21 来源：SLKOR官网

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当SiC MOSFET的LS导通时，首先ID会发生变化（见波形示意图T1）。在这个过程中，LS的ID沿增加方向流动，而HS的ID沿减少方向流动，受到等效电路图中表示的事件(I)的影响，产生了公式(1)中所示的电动势。这个电动势会导致电流流向源极侧对CGS进行充电，在LS处将VGS向下推，在HS处将VGS向负极侧拉，产生负浪涌（VGS的波形示意图T1）。

当ID的变化结束时，LS的VDS的电位降低（波形示意图T2）。因此，公式(2)中的电流会像等效电路图中的(II)-1、(II)-2那样流动，并且VGS会分别引发公式(3)、(4)中的电压上升。

VDS刚刚开始变化后，公式(3)中的VGS上升为主，随着时间的推移，公式(4)中的VGS也开始上升。换句话说，MOSFET的CGD/CGS比、驱动电路的RG_EXT、栅极驱动信号图形布线的电感值LTRACE对此具有很大影响。

如等效电路图所示，HS中的(II)-2的电流ICGD2处于VGS提升方向。因此，本来应该处于OFF状态的HS因VGS的提升而开始了导通工作。这种现象称为“误启动”。当HS发生误启动时，就会与LS的导通工作重叠，致使HS和LS的MOSFET同时导通，从而引发直通电流。

ICGD2会持续流动到LS的导通工作结束，并被积蓄在LTRACE中，但会在VSW变化结束的时间点消失，LTRACE产生电动势。这就是事件(III)。受RG_EXT等开关条件影响，ICGD2可能会达到几安培，并且该电动势可能会增加。

受上述事件(I)、(II)、(III)的影响，LS导通后的Gate-Source电压呈现出波形示意图中所示的动作。波形示意图和等效电路图的相同编号表示同一事件。另外，图中VGS的虚线波形表示理想的波形。

外置栅极电阻的影响

下面是SiC MOSFET桥式结构的LS导通时的双脉冲测试结果。(a)波形图的外置栅极电阻RG_EXT为0Ω，(b)为10Ω。图中的(I)、(II)、(III)同前面相应编号的事件。

比较(a)和(b)的波形可以看出，RG_EXT越小，由事件(I)引起的VGS下降就越大。此外，由于开关速度非常快，因此事件(III)在(a)中很突出;但由于RG_EXT为0Ω，因此几乎没有观察到事件(II)的波形。另一方面，在(b)中，事件(II)-2和RG_EXT引起的VGS升程明显。

从该结果可以清楚地看出，要想降低诱发LS导通时HS误启动的事件(II)-2的VGS升程，就需要减小HS关断时的外置栅极电阻RG_EXT。然而，多数情况下，HS和LS的RG_EXT是相同的，因此，当减小RG_EXT时，LS的dVDS/dt将增加，如公式(1)所示，HS的ICGD会增加。从公式(4)可以看出，结果会导致HS浪涌升高。

有一种对策方法是，使导通时和关断时的RG_EXT分离，并且仅减小关断时的RG_EXT。常规方法是使用二极管的方法，如右图所示。使用这种方法，在导通状态下工作的电阻只有RG_ON，而在关断状态下，二极管导通并成为RG_ON和RG_OFF的并联电阻。因此，相对于导通时的电阻值，关断时的电阻值变小。

另外，与最前面说明中使用的波形示意图不同，HS的VGS波形之所以在紧靠事件(I)之前的位置向正极侧振荡，是因为事件(I)的电流开始流动的瞬间LSOURCE引起的电动势在通过CGS后立即被观测到了。

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本文由玉鹤甘茗转载自SLKOR官网，原文标题为:SiC MOSFET低边开关导通时的Gate-Source间电压的动作，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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型号- BTW69,MB10S,SL25T135FL,BTA26-1000,SL2306,SL2307,MB10F,SL2308,SMCJ440CA,SL2309,SL55X,SL40N60C,SL2310,SL2312,SL3400,SL54X,SL3402,SL3404,SL4614,RS1A,RS1M,SMF5.0CA,SS120F,SL13N50FS,MMBT4401,FMMT591,MMBT4403,SLESDL0603-24,LM317,2N5551,SL21814,WE07DF-B,MMSZ5259B,SL2016384MXXX,S2MB,SL2301,SL2302,SL53X,SL2305,1SMB5921B,BTB20-600,SL322526MXXX,SL25N10,S2MF,SLESD8D36V,SL252025MXXX,SL201624MXXX,SLESD5Z5.0C,SL201616MXXX,2SK3018W,SL4949,SS52BF,2SB1261,SL10N65F,ZM4727,2SB1132,1SMA4777A,SL1609SH,DB307S,SL8N65F,SL05N06A,GBLC15CI,2SA812,SLESD8D15V,FMMT493,FMMT491,SMDJ170A,WE05DF-BS,2SC3357,SL78LXX,SL1609SL,SMF5.0A,US1AF,SL12020BT,MMBZ5221B,MMDL914,SL1609TH,SL05N06Z,RS2A,SL42764,SL1609TL,SL53N65CT,SS320BF,SLESD5Z7V0,FMMT489,RS2M,UMB10F,MM5Z2V0,GBLC03CI,MMBT5401,BT136-600,SS22,LMV321,SF1006DS,SL403,2N5401,SL6520B,SL21867,KBL4005,SL12030BT,UMB1F,SMF58CA,SS32,SMBJ5.0,2SK3018,SMBJ170CA,KBL410,BTA60-1200,GBLC12CI,US2AB,SL322512MXXX,WE24DF-B,SS12,SL3N170AP,SL503224MXXX,US2AF,SMF58A,SL50T65FL,SL1619SH,SL322527MXXX,SL42744D,SL1619SL,SS210B,LM321,SLESDL0603-16,SL201632MXXX,GBU410,IRLML6401,BCP51,BCP53,BCP52,BCP55,BCP54,BZX84C43,BCP56,SL1619TH,SL2733,SL1619TL,SL52X,TL432,TL431,SS52,NUP2105LT1G,SL201625MXXX,SL49SM3579M20P-20,SL252026MXXX,BTA80-1200,SLESDL0603-05,BCP68,SL27211DR,SLESD8D3V3,MMSZ5221B,TL431B,SL49SM26M20P-20,F1A,TL431A,DB207S,GBLC24CI,SS220F,2N7002E,BT136-800,F1M,SL85XXX,SL4822A,SL76N60CT,MC34063S,PC817,SL2328A,SL18N50F,BT137-600,MMBZ5262B,SM24C,SM36C,LMV358,RS3AB,SL27531,SS310C,SS310B,DB107S,SM12C,DB301S,SL40T120FL,KBL610,SL40N65CF,SL80N65CTL,SL12005B,GBP4005,SL49SM25M20P-20,SL22N120A,SL002N02K,SLESD5Z24,SL27525,SL27524,MMDT2222A,SL27523,US2MF,SL503225MXXX,SL252024MXXX,US2MB,SLESD3B5CM,SL05N10A,SL12P03S,C945,US2A,BFG520,SL252016MXXX,SL322532MXXX,SL2319A,SL40N65CT,SLESD5Z36,GBU6005,SL9013MXXXX,RS2AF,SL73XX,US2M,SS320F,ULN2803,SD20C,2SB1197K,SL4409N,ZMM2V0,SL12015B,SLESD5.0U035,US1A,SL10N120A,BTA08-600,SL0501,SL8205S,SL75T65FL1,US1M,BAS316,2SD965A,SL80N120A,S8550,SMBJ5.0C,S6AC,M1,BSS123,SL0601,LM2904,M7,SLPESD15VL1BA,LM2902,GBP3005,SL2309A,SLPESD0402M07,BT137-800,MM1Z39B,SLESD9B5.0ST5G,SLPESD0402M05,SMCJ440A,SMAJ5.0CA,SLPESD0402M03,GBU8005,BTA12-600,SLPESD2CAN,SL27212,SM20C,RS5AB,SS520F,SL201630MXXX,MMDT3904,BSS138,BTA41-1600,FR101,MMDT3906,SL322525MXXX,SM4001PL,FR107,SMDJ5.0CA,BTA06-600,BZT52B51BS,SLPESD0402M18,SL322530MXXX,SL17010BT,SLPESD0402M16,WE12DF-B,SLPESD0402M12,SL15T65FL,MM5Z75,SMDJ5.0A,SL80N10,DB201S,SL54MXXXX,S1A,S5AC,SL12010B,2SD1624,S5AB,SL6206-XXMR,SMCJ5.0CA,B772,S1M,KBL6005,SMBJ170A,MMBT2222A,AMS1117-XX,SL75XX,SL322524MXXX,DB101S,GBP2005,S2A,BT138-600,2SC1815,SL10N10A,SLESD9B3.3S,SL4813A,S2M,SL002P02K,SL50N120A,SL9435A,SL4184,S10AC,SL80N65CT,1SMA4728A,BC857B,RS5MB,SLESD5Z15V,SL2005E,SL6508B,SL4264-2,ZMM200,MMDT2227,SL1625SL,SM08C,SL252030MXXX,SL20N10,GBU4005,SD03C,SD15C,SL1625SH,BC856B,BTA10-800,SL1625TL,SL306X,GBP210,BT169D,SL4284,SL4041,SL1625TH,SL1613SH,ABS2,BTA26-800,SS510B,ABS10,1N4001W,SS510C,SL6506B,S3AC,S3AB,KBP4005,2SC1623,2SC2712,SF1001DS,2SD1781,ES1JF,BZT52B43,1SS226,SL1613TL,SL305X,SS52F,SL27714,SL1002B,BTA41-800,SD05C,SL4275,SL1613TH,SS52B,SS52C,S10MC,SS525,BT138-800,SLESD2401QC,2SD1898,BZT52C2V4S,SL2333A,SL100N03,DSK220,SL40N60CF,D882,ES2JF,GBP310,SL3N06,SL304X,SLM511,SL10P04S,SL49SM24M20P-20,BT139-600,1SS355,SL4N65F,S2AF,SL503212MXXX,SL3401S,1N4148W,S2AB,C1815,BTA04-600,ABS210,MMBT3904,ES2JB,KBP2005,MMBT3906,SL9945,MAC97A8,SL78XX,SL1623SL,SL7888,SL303X,ABS201,MAC97A6,BAV99,SLM501,SL17025BT,SL2192,SLPESD0201M24,KBP210,BZT52B3V0BS,SL1623SH,RS1AF,BTA41-1200,SLESD5Z12V,MB1F,SL4407A,1SS181,BC848B,78MXX,SM15C,SS510BF,GBP410,SM03C,MB1S,SL-10XX,SL302X,LL4148,SLM611,SLPESD3V3L1BA,SL2181,SLESD5Z2V5,MMBTA05,SL1623TH,SMAJ5.0A,MMBTA06,SL20T65FH,SL2184,SL14N120A,SL1623TL,SL2186,BT131-600,BC847B,SLPESD12VL1BA,2SC2873,DSK310,SL40T65FL,ES3JC,S8050,ES3JB,BAV70,SL27519,MMBT2907,MCR100-8,BCX51,SL27517,BSN20,MMBD4148,BCX53,SL301X,BCX52,BCX55,SLM601,SM18C,SLESD5B5CU,BCX54,SLM600,SL322516MXXX,SL27511,BAV20W,BCX56,SL27211E,KBP310,SL7603PXXXX,SL2302M,SLESD8H5.0CT5G,SL6800C,IRF640,SL7N65CN,SLESD8D5.0C,SD12C,S9013,SD24C,S9014,S9015,BC846B,SL10N06A,S9012,SL7N65CF,BT139-800,KBP3005,SL7N65CD,MCR100-6,BZT52C2V4,SL7N65CI,SM05C,2N3904,SL3139,SL27624,SS8550,SMAJ170CA,US1MF,BAV21W,SL8820,S9018,2N3906,SD36C,MM3Z75,BZT52C43S,BTB10-600,MMBTA55,SLW611,RS1MF,SL3134K,SS110,SS32BF,SL11N65CD,1N4007W,SL11N65CF,SL6512B,SL252012MXXX,SL8052A,SL1629SH,MM1W3V3,SL1629SL,KBP410,SL20162712MXXX,SLPESD5V0L1BA,SS22B,1N4148WS,SL60T65FL,1N4148WT,MMBTA56,DSK32,SS22F,SLW601,MMBTA44,SM4007PL,SL6540BT,MMBTA42,SL49SM6M20P-20,SL252040MXXX,SL36N120A,SL12040BT,SL201626MXXX,SL50N06D,SL1629TH,SL50328MXXX,SL827,BT151,BT152,SL1629TL,SL49SM8M20P-20,SL49SM27M20P-20,SL826,DSK22,SL11N65CQ,SL49SM12M20P-20,SL49SM16M20P-20,SL49SM10M20P-20,S6MC,2N7002,M1F,SLPESD0201M05,MMBT6517,SL322540MXXX,GBLC08CI,2SC5824,2SC4617,SL2009,ES1K,GBU610,SL6510B,BZT52B2V4,SL12N65F,SL1605SH,ULN2001,SL2014,SL2015,SL2136,SL1605SL,MM1W330,BSS84,BZX84C2V4,MM3Z2V0,SL9193MXXXX,DSK12,BAW56,SL21N65C

选型指南 - SLKOR - 2024/7/1 PDF 中英文下载

SiC MOSFET桥式结构的栅极驱动电路

LS（低侧）侧SiC MOSFET在Turn-on和Turn-off时的VDS和ID变化方式不同。在讨论SiC MOSFET的这种变化对Gate-Source电压（VGS）的影响时，需要考虑包括SiC MOSFET的栅极驱动电路在内的等效电路。

设计经验发布时间 : 2024-07-19

【产品】额定电流3.0A的高效率低功耗肖特基二极管SS34，正向压降仅0.5V，广泛用于小电流电路

萨科微SLKOR肖特基二极管SS34具有低功耗、高效率、高电流能力、低VF、高浪涌电流能力和耐高温等特点。它被广泛应用于小电流的电路，有在开关电路中续流和反向隔离等作用，以实现电路的稳定工作和元件的保护。

产品发布时间 : 2023-08-16

SL87N120A 1200V 17mΩ SiC MOSFET

型号- SL87N120A

数据手册 - SLKOR - Rev.1 - 03 May 2020 PDF 中文下载

【经验】与相同功率的Si MOSFET相比，SiC MOSFET导通电阻、开关损耗大幅降低且具有高温工作特性

在SiC MOSFET的开发与应用方面，与相同功率等级的Si MOSFET相比，SiC MOSFET导通电阻、开关损耗大幅降低，适用于更高的工作频率，另由于其高温工作特性，大大提高了高温稳定性。

设计经验发布时间 : 2022-12-03

Good News! Slkor Products Passed the CP65 test

“Kinghelm, Connecting the World“, focuses on the field of microwave and radio frequency technology. Kinghelm‘s brand products include dual-mode Beidou GPS antennas, Bluetooth antennas, WiFi, Zigbee antennas, NB-IoT, LORA, UWB, Beidou B3 frequency antennas, 4G, 5G antenna series, and supporting RF connector terminals.

产品发布时间 : 2024-06-01

萨科微Slkor产品通过“加州65”测试公司实力不断提升

近日，经过加州65标准的一系列严格测试，萨科微半导体(www.slkoric.com)顺利过关，意味着萨科微的产品不含有被列入危害物质清单的化学物质，符合美国加州的法律要求，有利于维护国内外消费者的权益和保护公共健康。

产品发布时间 : 2024-07-26

Efficient Low Voltage MOSFET SL120N03R with a Vdss of 30V, a continuous drain current (Id) of 120A

SL120N03R is a low-voltage MOSFET produced by SLKOR Semiconductor Company. It is manufactured using advanced Trench technology, providing users with excellent gate charge and on-resistance (RDSon), thereby reducing communication and conduction losses. Therefore, this device is very suitable for AC/DC power conversion, load switching, and industrial power applications.

产品发布时间 : 2024-02-05

Excellent High-voltage MOSFET SL8N65CF with Drain-source Voltage of 650V, Continuous Drain Current of 8A

SL8N65CF has many notable features, including low gate charge, ultra-fast switching, and improved dV/dt capability. These characteristics enable the device to have faster response times and higher reliability, providing users with a better experience and performance. Whether in automotive applications or high-power applications, SL8N65CF can demonstrate its excellent characteristics and meet various needs.

产品发布时间 : 2024-03-07

The Medium Voltage MOSFET MMBF170L with a Appropriate Drain-source Voltage (60V), Continuous Drain Current (300mA)

MMBF170L is an N-channel MOSFET known for its excellent product characteristics, including appropriate drain-source voltage (60V), continuous drain current (300mA), low on-state resistance (3Ω@10V, 500mA), and a lower threshold voltage (2.5V@ 250μA), making it an ideal choice for applications in power management, electric motor control, charging stations, and auxiliary electronic device control.

产品发布时间 : 2024-03-16