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| VNH2SP30TR-E Datasheet, PDF (26/33 Pages) STMicroelectronics – Automotive fully integrated H-bridge motor driver | |||
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Package and PCB thermal data
VNH2SP30-E
4.1.1
Thermal calculation in clockwise and anti-clockwise operation in
steady-state mode
Table 15. Thermal calculation in clockwise and anti-clockwise operation in steady-
state mode
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
OFF ON
ON
OFF
PdHSB x RthHS + PdLSA
x RthHSLS + Tamb
PdHSB x RthHSLS +
PdLSA x RthLS + Tamb
PdHSA x RthHSLS + PdLSB
x RthLS + Tamb
PdHSB x RthHSLS + PdLSA
x RthLSLS + Tamb
4.1.2
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
4.1.3
Thermal calculation in transient mode(a)
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
4.1.4
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
a. Calculation is valid in any dynamic operating condition. Pd values set by user.
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