Hi team,
I am interested by using the TPS54561 4.5-V to 60-V Input, 5-A, Step-Down DC-DC Converter.
However I need to clarify with you the maximum ambient temperature allowed.
The datasheet says that the component can be used up to 150°C but in page 36 the SOA figures show that even under a low current (1A) the maximum ambient temperature is 85°C.
Why such a difference?
For Example If I made the calculation of paragraph 8.2.1.2.11 (p:34) for 1A current, the total device power dissipation reaches 0.231W
=> TAmax= 150°C - 35.1°C/W (RΘta) * 0.231W = 142,9°C Thus by calculation, the maximum ambient temperature should be 142.9°C instead of 85°C of the figure 48.
Can you tell me which value I have to taking into account? Is there a problem with the figure 47 through figure 50?
Thank you for your reply.
