FN4423 Rev 3.00

Page 8 of 9

February 5, 2015

HIP6200, HIP6201

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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:

JA is the thermal resistance from junction to ambient.

Example:

HIP6200/1 Junction Temperature Calculation

TAMBIENT = 70oC

PDISS = 0.2W

JA = 100oC/W

THIP6200 = 70oC + (0.2 x 100) = 90oC

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

TAMBIENT = 70oC

THIP6200 = 110oC max

JA = 80oC/W (this number is dependent upon airflow and

the amount of pc board trace connected to HIP6200

Max PDISS = (110oC - 70oC)/(80oC/W) = 0.5W

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)

102

103

104

0.1

0.2

0.3

0.4

0.5

0.6

TR1 = 2s, TR2 = 10s

TR1 = 5s, TR2 = 20s

TR1 = 10s, TR2 = 30s

TR1 = 15s, TR2 = 40s

THIP6200

TAMBIENT PDISS JA





+

=

(EQ. 8)