VNH3SP30 datasheet(21/26 Pages) STMICROELECTRONICS

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VNH3SP30

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

OFF

PdHSA x RthHS + PdLSB x

RthHSLS + Tamb

PdHSA x RthHSLS + PdLSB x

RthLSLS + Tamb

PdHSA x RthHSLS + PdLSB x

RthLS + Tamb

OFF

PdHSB x RthHS + PdLSA x

RthHSLS + Tamb

PdHSB x RthHSLS + PdLSA x

RthLS + Tamb

PdHSB x RthHSLS + PdLSA x

RthLSLS + Tamb

TH δ

THtp

–

()

⋅

where

⁄

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