2-448

In actual systems, the load transient will most likely be of

varying frequency and step size. The power dissipation

of the HIP6200/1 becomes even more difficult to estimate

analytically.

HIP6200 Temperature Rise

The HIP6200/1 junction temperature can be estimated

simply by:

where:

Example: HIP6200/1 Junction Temperature Calculation

In a similar fashion, one could estimate the maximum

allowable power dissipation for given maximum ambient and

transient loading and determine the boundary of maximum

transient frequency.

Example

Maximum Transient Frequency Calculation

the amount of pc board trace connected to HIP6200

From Figures 4 and 5, the estimated maximum transient

frequency is obtained for any of the seven cases shown. For

instance, from Figure 4, the maximum transient frequency is

about 4kHz for the 8A transient step and the conditions

stipulated.

FIGURE 5. ESTIMATED HIP6200, HIP6201 POWER

DISSIPATION vs CONVERTER RESPONSE TIME

TRANSIENT FREQUENCY (Hz)

0.1

0.2

0.3

0.4

0.5

0.6

T

HIP6200

T

AMBIENT

P

DISS

Θ

JA

•

()

+

=

(EQ. 8)

HIP6200, HIP6201