Package and PCB thermal data

VNQ830

22/28

Doc ID 7390 Rev 5

4

Package and PCB thermal data

4.1

SO-28 thermal data

Figure 27.

SO-28 PC board

Note:

Layout condition of Rth and Zth measurements (PCB FR4 area = 58mm x 58mm, PCB

thickness = 2mm, Cu thickness = 35µm, Copper areas: 0.5 cm2, 3 cm2, 6 cm2).

RthA = thermal resistance junction to ambient with one chip ON

RthB = thermal resistance junction to ambient with both chips ON and Pdchip1 = Pdchip2

RthC = mutual thermal resistance

Table 16.

Thermal calculation according to the PCB heatsink area

Chip 1

Chip 2

Tjchip1

Tjchip2

Note

ON

OFF

RthA x Pdchip1 + Tamb

RthC x Pdchip1 + Tamb

OFF

ON

RthC x Pdchip2 + Tamb

RthA x Pdchip2 + Tamb

ON

ON

RthB x (Pdchip1 + Pdchip2) +

Tamb

RthB x (Pdchip1 + Pdchip2) +

Tamb

Pdchip1 = Pdchip2

ON

ON

(RthA x Pdchip1) + RthC x

Pdchip2 + Tamb

(RthA x Pdchip2) + RthC x

Pdchip1 + Tamb

Pdchip1 ≠ Pdchip2

Obsolete

Product(s)

- Obsolete

Product(s)