CPC7524 datasheet(13/15 Pages) IXYS

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INTEGRATED CIRCUITS DIVISION

CPC7524

R02

www.ixysic.com

higher switch current and/or higher ambient operating

temperatures will need to consider the thermal

performance.

Being a real physical device the CPC7524 has a finite

thermal capability that when properly considered will

ensure appropriate behavior and performance.

Determination of the thermal constraint is easily

accomplished using the following power equations:

and

Where PVDD is the dissipated power drawn from the

VDD supply and PSW is the power dissipated by the

active switches. The VDD power can be calculated

from the “VDD Voltage Supply Specifications” on

page 7 while the power dissipated by the switches is

the sum of the concurrent active switches. Total switch

power is the sum of the maximum current through

each active switch times the On-Resistance of the

switch (ISWx

2 XR

ON).

The second equation is used to calculate the

maximum ambient temperature that the device can be

operated in based on the calculated total power of the

previous equation. PTOTAL, the value obtained in the

first equation;

T, the junction temperature rise of the

CPC7524 from ambient; and



JA, the thermal

impedance of the device package are used to

determine the maximum operating ambient

temperature.

Using the junction temperature rise equation

T=T

J -TA; the thermal impedance JA =70C/W; and a

maximum junction temperature TJ-MAX = 110C, the equation

reduces to:

To avoid entering thermal shutdown, the value for the

maximum junction temperature was set to 110

C.

Conversely, it is possible to rework the equations to

determine the maximum switch current for a maximum

ambient current.

When using the individual switches of the CPC7524

within their allowable operating region, no restrictions

are placed on any other switch.

TOTAL

T



---------

AMAX

–

JMAX

–

TOTAL







–

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