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VN771K Datasheet(PDF) 27 Page - STMicroelectronics

Part # VN771K
Description  Quad smart power solid state relay for complete H-bridge configurations
PDF  33 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VN771K Datasheet(HTML) 27 Page - STMicroelectronics

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VN771K
Thermal data
Doc ID 12534 Rev 4
27/33
4.2
Thermal calculation in clockwise and anti-clockwise
operation in steady state mode
4.2.1
Thermal resistances definition
Values according to the PCB heatsink area.
RthHS = RthHS1 = RthHS2 = high side chip thermal resistance junction to ambient (HS1 or HS2
in on-state)
RthLS = RthLS3 = RthLS4 = low side chip thermal resistance junction to ambient
RthHSLS = RthHS1LS4 = RthHS2LS3 = mutual thermal resistance junction to ambient between
high side and low side chips
RthLSLS = RthLS3LS4 = mutual thermal resistance junction to ambient between low side chips
4.2.2
Thermal calculation in transient mode(b)
TjHS12 = ZthHS x PdHS12 + ZthHSLS x (PdLS3 + PdLS4) + Tamb
TjLS3 = ZthHSLS x PdHS12 + ZthLS x PdLS3 + ZthLSLS x PdLS4 + Tamb
TjLS4 = ZthHSLS x PdHS12 + ZthLSLS x PdLS3 + ZthLS x PdLS4 + Tamb
4.2.3
Single pulse thermal impedance definition
Values according to the PCB heatsink area.
ZthHS = high side chip thermal impedance junction to ambient
ZthLS = ZthLS3 = ZthLS4 = low side chip thermal impedance junction to ambient
ZthHSLS = ZthHS12LS3 = ZthHS12LS4 = mutual thermal impedance junction to ambient between
high side and low side chips
ZthLSLS = ZthLS3LS4 = mutual thermal impedance junction to ambient between low side chips
4.2.4
Pulse calculation formula
where
δ = tP/T
Table 19.
Thermal calculation in clockwise and anti-clockwise operation in steady state mode
HS1
HS2
LS3
LS4
TjHS12
TjLS3
TjLS4
On
Off
Off
On
PdHS1 x RthHS + PdLS4 x
RthHSLS + Tamb
PdHS1 x RthHSLS + PdLS4
x RthLSLS + Tamb
PdHS1 x RthHSLS + PdLS4 x
RthLS + Tamb
Off
On
On
Off
PdHS2 x RthHS + PdLS3 x
RthHSLS + Tamb
PdHS2 x RthHSLS + PdLS3
x RthLS + Tamb
PdHS2 x RthHSLS + PdLS3 x
RthLSLS + Tamb
b.
Calculation is valid in any dynamic operating condition. Pd values set by user.
Z
TH
δ
R
TH δ
Z
THtp
1
δ
–
()
+
⋅
=



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