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VNH7070AY Datasheet(PDF) 38 Page - STMicroelectronics

Part # VNH7070AY
Description  Automotive fully integrated H-bridge motor driver
Download  48 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VNH7070AY Datasheet(HTML) 38 Page - STMicroelectronics

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Package and PCB thermal data
VNH7070AY
38/48
DS12207 Rev 5
9.1.1
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 chip.
9.2
Thermal Characterization during transients
Table 17. Thermal model for junction temperature calculation in steady-state conditions
Chip 1
Chip 2
Chip 3
Tjchip1
Tjchip2
Tjchip3
ON
OFF
ON
Pdchip1.RthA + Pdchip3 .
RthAC + Tamb
Pdchip1.RthAB + Pdchip3
. RthBC + Tamb
Pdchip1.RthAC + Pdchip3
. RthC + Tamb
ON
ON
OFF
Pdchip1.RthA + Pdchip2 .
RthAB + Tamb
Pdchip1.RthAB + Pdchip2
. RthB + Tamb
Pdchip1.RthAC + Pdchip2
. RthBC + Tamb
ON
OFF
OFF
Pdchip1.RthA + Tamb
Pdchip1.RthAB + Tamb
Pdchip1.RthAC + Tamb
OFF
ON
ON
(Pdchip2 + Pdchip3) .
RthAB + Tamb
Pdchip2.RthB + Pdchip3 .
RthBC + Tamb
Pdchip2 .
RthBC + Pdchip3 .
RthC + Tamb
Ths
PDhs Zhs Zhsls PdIsA PdISB
+
 T
amb
+
+
=
TIsA
PdIsA ZIs Pdhs Zhsls PdIsB ZIsIs Tamb
+
+
+
=
TIsB
PdIsB ZIs Pdhs Zhsls PdIsA ZIsIs Tamb
+
+
+
=


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