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VNH2SP30 数据表(PDF) 20 Page - STMicroelectronics |
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VNH2SP30 数据表(HTML) 20 Page - STMicroelectronics |
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20 / 26 page  VNH2SP30-E 20/26 Table 17. Thermal Calculation In Clockwise And Anti-clockwise Operation In Steady-state Mode Thermal Resistances Definition (values according to the PCB heatsink area) RthHS = RthHSA = RthHSB = High Side Chip Thermal Resistance Junction to Ambient (HSA or HSB in ON state) RthLS = RthLSA = RthLSB = Low Side Chip Thermal Resistance Junction to Ambient RthHSLS = RthHSALSB = RthHSBLSA = Mutual Thermal Resistance Junction to Ambient between High Side and Low Side Chips RthLSLS = RthLSALSB = Mutual Thermal Resistance Junction to Ambient between Low Side Chips Thermal Calculation In Transient Mode (*) TjHSAB = ZthHS x PdHSAB + ZthHSLS x (PdLSA + PdLSB) + Tamb TjLSA = ZthHSLS x PdHSAB + ZthLS x PdLSA + ZthLSLS x PdLSB + Tamb TjLSB = ZthHSLS x PdHSAB + ZthLSLS x PdLSA + ZthLS x PdLSB + Tamb Single Pulse Thermal Impedance Definition (values according to the PCB heatsink area) ZthHS = High Side Chip Thermal Impedance Junction to Ambient ZthLS = ZthLSA = ZthLSB = Low Side Chip Thermal Impedance Junction to Ambient ZthHSLS = ZthHSABLSA = ZthHSABLSB = Mutual Thermal Impedance Junction to Ambient between High Side and Low Side Chips ZthLSLS = ZthLSALSB = Mutual Thermal Impedance Junction to Ambient between Low Side Chips Pulse Calculation Formula (*) Calculation is valid in any dynamic operating condition. Pd values set by user. HSA HSB LSA LSB TjHSAB TjLSA TjLSB ON OFF OFF ON PdHSA x RthHS + PdLSB x RthHSLS + Tamb PdHSA x RthHSLS + PdLSB x RthLSLS + Tamb PdHSA x RthHSLS + PdLSB x RthLS + Tamb OFF ON ON OFF PdHSB x RthHS + PdLSA x RthHSLS + Tamb PdHSB x RthHSLS + PdLSA x RthLS + Tamb PdHSB x RthHSLS + PdLSA x RthLSLS + Tamb Z TH δ R TH δ Z THtp 1 δ – () + ⋅ = where δ t p T ⁄ = |
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