VNH5050ATR-E datasheet(26/33 Pages) STMICROELECTRONICS

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Package and PCB thermal data

VNH5050A-E

26/33

Doc ID 16009 Rev 10

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

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

Figure 18.

Detailed chipset configuration

Equation 1: pulse calculation formula

Calculation is valid in any dynamic operating condition. Pd values set by user.

CHIP 1

Zhs

CHIP 2

CHIP 3

Zls

Zhsls

Zlsls

δ Z

THtp

–

()

•

where

⁄

VNH5050ATR-E Datasheet(PDF) 26 Page - STMicroelectronics