【选型】分流贴片电阻ASR-K-7-2F用于450W汽车电子水泵BLDC电机相电流采样，精度为±1%

时间： 2023-07-07 来源：世强

技术问答

汽车BLDC电子水泵输出功率450W，采用12V电源系统，那么，450W汽车电子水泵输出电流为450W/12V=37.5A（最大承受50A电流），为保证输出电流的精准性，通常选用高精度金属合金电阻做电流采样。

选型参考如下因素：

1、低阻值，减少发热，一般选择2mΩ。

2、高的采样精度，一般选择±1%精度。

3、高功率特性，P=I²*R=5W（I=50A，R=2mΩ），考虑到温升降额影响，建议选择1.2倍裕量，至少6W功率更安全。

4、低温飘特性，降低温升对阻值影响，提升采样精度。

5、通过汽车级AEC-Q200认证。

针对如上设计考量，本文推荐业展电子分流贴片电阻 ASR-K-7-2F，采用最新的kamar合金和电子束焊接结构技术，精度为±1%，典型阻值为2mΩ，典型温度系数TCR为±50ppm/℃，工作温度范围-65℃ ~ +170℃，功率高达7W（TA=70℃条件下），典型电性参数参考如下图1所示。

图1：业展电子分流贴片电阻ASR-K-7-2F典型电性参数

推荐理由如下：

1、高功率：ASR-K-7-2F满足±1%精度，在70℃条件下，额定功率7W，才需要做降额处理，典型温度降额曲线参考如下图2所示。

图2：业展电子kamar合金电阻ASR-K-7-2F典型温度降额曲线

2、高精度电流检测：

以标准额定功率P₇₀_℃=7W计算，可提供高达59.16A的交流和直流电流的高精度电流检测（根据P=I²*R计算，推出I=√（P/R），得到I=59.16A）。

3、典型温飘±50ppm/℃，具有出色的低温漂特性，受温升影响更小。

4、通过AEC-Q200认证，满足车规认证要求。

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业展电子电阻选型表

业展电子提供以下技术参数的电阻选型，工作温度：-65~170℃，精度：-5%~5%。

产品型号	品类	安规/环境规范	应用等级	等级认证标准	工作温度范围（最低）	工作温度范围（最高）	精度	阻值
ASR-M-3-0.3F	电阻	RoHS	工业级	国密一级	-65℃	+170℃	1%	0.3mΩ

选型表 - 业展电子立即选型

业展电子（YeZhan）与 ISA/VISHAY/BOURNS低阻值电阻器产品型号对照表

型号- ASR-M-3-0.3F,BRS,ASR-K-7-2F,WSL39214L000FEA,BVS-I-R004-1.0,BVB-I-R003-1.0,WSLP3921L5000FEA,BVS-M-R00075-1.0,WSLT3921L5000FEA,ASR-M-5-1.2F,ASR-M-5-0.5F,WSLP40261L000FEA,WSLT3921,SBB-M-1F-N-T5,WSLP40263L000FEA,WSL3921L6000FEA,WSL2726,ASR-K-7-1F,WSLT40263L000FEA,CSS2H-5930R-3L00F,ASR-M-5-0.6F,BVS-M-R0006-1.0,WSLT40261L000FEA,WSL3921,BVE-M-R0003-1.0,SBB-M-1F-Y-T5,WSL2726L5000FEA,BVT-I-R003-1.0,CSS2H-5930R-L500X,BRS-M-R003-1.0,WSL39212L000FEA,WSL59312L000FEA,WSLP39211L5000FEA,ASR-M-7-0.5F,WSLT2726,WSL59311L5000FEA,ASR-M-5-0.75F,ASR-M-3-0.5F,ASR-M-5-0.7F,WSLT39214L000FEA,BVE-I-R0015-1.0,WSLF25123L000FEA,ASR-K-7-1.5F,BVE-I-R001-1.0,SBN-M-4F-T2,WSLP27263L000FEA,ASR-K-5-5F,BVS-M-R0002-1.0,BVS-I-R001-1.0,WSL3921L7000FEA,WSLF2512L3000FEA,WSL40263L000FEA,WSLT5931L2500FEA,CSS2H-2512K-2L00F,BVB,BVE,WSLT39212L5000FEA,ASR-M-7-0.3F,BVS,BVR,WSLP5931L2500FEA,BVE-M-R0002-1.0,BVT,WSLT59313L000FEA,WSLF25122L5000FEA,ASR-K-5-4F,BVB-M-R001-1.0,ASR-M-7-0.75F,BVS-M-R00082-1.0,WSLP59313L000FEA,WSL3921L8200FEA,BVS-I-R003-1.0,WSL4026,WSLT27262L000FEA,WSLP3921L4000FEA,WSLP27262L000FEA,WSLP59312L5000FEA,SBB-M-0.3F-Y-T5,ASR-K-5-3F,WSLT3921L7000FEA,WSL39211L5000FEA,WSLT59312L5000FEA,WSLP39212L000FEA,WSL40262L000FEA,WSLT3921L4000FEA,BRS-A-R020-1.0,CSS2H,BRS-N-R010-1.0,SBN-M-3F-Y,BVT-I-R004-1.0,SBN-K-20F,ASR-M-3-3F,BVS-M-R0007-1.0,BVR-M-R0005-1.0,BVT-M-R0005-1.0,ASR-K-5-2F,BVE-M-R0007-1.0,WSLP2726L5000FEA,WSLT2726L5000FEA,WSLT3921L7500FEA,WSLT39212L000FEA,WSLF2512L5000FEA,WSLP3921L7000FEA,WSLF25122L000FEA,WSLF25125L000FEA,SBB-K-3F-N-T5,WSLT39215L000FEA,WSL5931,BVT-I-R0015-1.0,ASR-M-5-0.2F-T1,ASR-M-3-2F,WSLP3921,ASR-K-5-1F,WSLP3921L6000FEA,WSL5931L2500FEA,WSL27263L000FEA,WSLP39215L000FEA,WSLP2726,ASR-K-5-1.5F,SBN-M-5F-T2,SBB-K-3F-Y-T5,ASR-M-3-1F,WSL39213L000FEA,WSL59311L000FEA,ASR-M-7-0.7F,BVB-I-R002-1.0,WSLT3921L6000FEA,SBB-K-2F-N-T5,WSL39215L000FEA,WSL59312L5000FEA,BVS-M-R001-1.0,ASR-M-3-2.5F,WSLT5931L2000FEA,WSL3921L7500FEA,SBB-K-2F-Y-T5,BVS-I-R002-1.0,BRS-I-R030-1.0,WSLP5931L2000FEA,WSLT59311L5000FEA,WSLP40262L000FEA,BVS-I-R0025-1.0,ASR-K-3-5F,BVB-M-R0005-1.0,WSL5931L7500FEA,BVT-I-R0025-1.0,BVT-I-R005-1.0,CSS2H-5930R-L200X,WSLP3921L2000FEA,WSLT5931L7000FEA,BVE-I-R003-1.0,WSLT39211L5000FEA,ASR-M-5-1F,WSLP5931,ASR-K-3-4F,WSLP3921L7500FEA,CSS2H-5930R-L300X,WSL5931L2000FEA,SBN-K-15F-T3,BVS-M-R0004-1.0,CSS2H-5930R-2L00X,SBN-F-20F,WSLT39213L000FEA,ASR-K-5-2.5F,BRS-M-R005-1.0,WSLF25124L000FEA,SBB-M-0.5F-Y-T5,WSLP5931L7000FEA,WSLT3921L2000FEA,WSL5931L3000FEA,BVR-I-R003-1.0,WSLP39213L000FEA,BVE-M-R00025-1.0,WSLT40262L000FEA,SBN-K-10F,WSL27261L000FEA,WSL39211L000FEA,WSLP39212L5000FEA,WSL59313L000FEA,WSLP4026,WSLF,SBB-M-0.5F-N-T5,WSLT59311L000FEA,WSLT59312L000FEA,WSLP59311L000FEA,WSLP59312L000FEA,WSL5931L7000FEA,ASR-M-7-0.2F,WSLT27263L000FEA,BRS-M-R004-1.0,WSLT5931L7500FEA,ASR-M-3-1.5F,BVE-I-R002-1.0,BVS-I-R005-1.0,WSLP5931L7500FEA,WSLP39214L000FEA,WSL27262L000FEA,WSL3921L5000FEA,WSLT4026,BVT-M-R001-1.0,WSL3921L2000FEA,CSS2H-5930R-1L00X,BVE-M-R0075-1.0,SBN-K-30F-T2,BVE-I-R0025-1.0,BVT-I-R002-1.0,ASR-M-7-0.25F,WSL3921L4000FEA,BVR-M-R001-1.0,WSLT39211L000FEA,WSLF25121L000FEA,WSLF25121L5000FEA,BVS-M-R0005-1.0,BVS-I-R0015-1.0,ASR-K-7-3F,BRS-I-R015-1.0,WSLP3921L8200FEA,WSLP39211L000FEA,WSLP27261L000FEA,WSLT27261L000FEA,WSL40261L000FEA,ASR-M-5-0.82F,WSLT5931L3000FEA,WSL39212L5000FEA,WSLP59311L5000FEA,WSLT5931,WSLP5931L3000FEA,WSLT3921L8200FEA,ASR-M-5-0.4F,BVR-I-R002-1.0,BVT-M-R0003-1.0,ASR-K-7-2.5F

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业展电子与 ISA/VISHAY/BOURNS低阻值电阻器型号对照表

对标ISA/VISHAY/BOURNS低阻值电阻

产品型号	品类	对标 ISA系列	对标ISA型号	对标 VISHAY系列	对标 VISHAY型号
ASR-M-3-0.3F	低阻值电阻器	BVT	BVT-M-R0003-1.0	WSLF	WSLF2512L3000FEA

选型表 - 业展电子立即选型

业展电子-BOURNS/VISHAY低阻值电阻器对照表

描述- 业展电子与BOURNS、VISHAY的低阻值电阻器型号对照表。

型号- ASR-M-3-0.3F,ASR-K-3-2.5F,WSL39215L000FEA,SBB-K-2F-N-T5,ASR-K-7-2F,WSL39214L000FEA,WSL59312L5000FEA,WSLP3921L5000FEA,WSLT3921L5000FEA,WSLT5931L2000FEA,WSL3921L7500FEA,SBB-K-2F-Y-T5,ASR-M-5-0.5F,WSLP5931L2000FEA,WSLP40261L000FEA,WSLP40262L000FEA,WSLT59311L5000FEA,SBB-M-1F-N-T5,WSLP40263L000FEA,WSL3921L6000FEA,ASR-K-3-5F,WSL5931L7500FEA,ASR-K-7-1F,WSLP3921L2000FEA,CSS2H-5930R-3L00F,WSLT40263L000FEA,WSLT5931L7000FEA,ASR-M-5-0.6F,WSLT40261L000FEA,WSLT39211L5000FEA,SBB-M-1F-Y-T5,WSL2726L5000FEA,WSL39212L000FEA,WSL59312L000FEA,ASR-M-5-1F,WSLP39211L5000FEA,ASR-K-3-4F,WSL59311L5000FEA,WSLP3921L7500FEA,ASR-M-5-0.75F,WSL5931L2000FEA,CSS2H-5930R-2L00X,ASR-M-3-0.5F,ASR-M-5-0.7F,WSLT39213L000FEA,WSLT39214L000FEA,ASR-K-5-2.5F,WSLF25123L000FEA,WSLF25124L000FEA,ASR-K-7-1.5F,WSLP5931L7000FEA,WSLT3921L2000FEA,WSLP27263L000FEA,WSL5931L3000FEA,ASR-K-5-5F,WSL3921L7000FEA,WSLF2512L3000FEA,ASR-K-3-3F,WSLP39213L000FEA,WSL40263L000FEA,CSS2H-2512K-2L00F,WSLT5931L2500FEA,WSLT39212L5000FEA,WSLT40262L000FEA,WSL27261L000FEA,WSL39211L000FEA,WSLP39212L5000FEA,ASR-M-7-0.3F,WSL59313L000FEA,SBB-M-0.5F-N-T5,WSLP5931L2500FEA,WSLT59313L000FEA,WSLF25122L5000FEA,WSLT59311L000FEA,WSLT59312L000FEA,ASR-K-5-4F,ASR-K-3-2F,ASR-M-7-0.75F,WSLP59311L000FEA,WSLP59312L000FEA,WSLP59313L000FEA,WSL5931L7000FEA,WSL3921L8200FEA,ASR-M-7-0.2F,WSLT27263L000FEA,WSLT27262L000FEA,WSLP3921L4000FEA,ASR-K-3-1.5F,WSLP27262L000FEA,WSLP59312L5000FEA,ASR-K-5-3F,WSLT3921L7000FEA,WSL39211L5000FEA,WSLT59312L5000FEA,WSLP39212L000FEA,WSL40262L000FEA,WSLT5931L7500FEA,WSLT3921L4000FEA,WSLP5931L7500FEA,WSLP39214L000FEA,WSL27262L000FEA,WSL3921L5000FEA,CSS2H-5930R-1L00X,WSL3921L2000FEA,ASR-K-5-2F,WSLP2726L5000FEA,WSLT2726L5000FEA,WSLT3921L7500FEA,WSL3921L4000FEA,ASR-M-7-0.25F,WSLT39212L000FEA,WSLT39211L000FEA,WSLF2512L5000FEA,WSLP3921L7000FEA,WSLF25121L000FEA,WSLF25122L000FEA,WSLF25125L000FEA,SBB-K-3F-N-T5,WSLF25121L5000FEA,WSLT39215L000FEA,ASR-M-5-0.2F-T1,ASR-K-5-1F,ASR-K-7-3F,WSLP3921L8200FEA,WSLP39211L000FEA,WSLP27261L000FEA,WSLT27261L000FEA,WSL40261L000FEA,ASR-M-5-0.82F,WSLT5931L3000FEA,WSL39212L5000FEA,WSL5931L2500FEA,WSLP3921L6000FEA,WSLP59311L5000FEA,WSL27263L000FEA,WSLP39215L000FEA,WSLP5931L3000FEA,ASR-K-5-1.5F,WSLT3921L8200FEA,ASR-M-5-0.4F,SBB-K-3F-Y-T5,ASR-M-3-1F,WSL39213L000FEA,ASR-K-7-2.5F,WSL59311L000FEA,ASR-M-7-0.7F,WSLT3921L6000FEA

对照表 - 业展电子