UA78: UA7824

Karthik A

Part Number: UA78

Tool/software:

Hello .,

what is the Maximum power dissipation of UA7824.https://www.mouser.in/ProductDetail/Texas-Instruments/UA7824CKTTR?qs=mymQUwU5zNrBxvFtPGDa6w%3D%3D

7 months ago

0 Ishaan Shetye 7 months ago

TI__Genius 13680 points

Hello,

The maximum power dissipation (PD_max) for any LDO depends on the ambient temperature (Ta) of operation. In this case, maximum power dissipation would correspond to a junction temperature (Tj) = 150°C. Please let me know the ambient temperature and I will calculate PD_max for you.

Assuming Ta = 25°C,

PD_max = (Tj - Ta)/RθJA = (150 - 25)/25.3 = 4.94 W

0 Karthik A 6 months ago in reply to Ishaan Shetye

Prodigy 90 points

Hi Ishaan

could you help me with relation between Power dissipation and Junction temperature relation.,

say if Pd is 3W what would be the junction temperature.

How to calculate junction temperature.

+1 Ishaan Shetye 6 months ago in reply to Karthik A

TI__Genius 13680 points

Hi Karthik,

Yes, sure. Please see section 1.1 of this application note: Semiconductor and IC Package Thermal Metrics (Rev. D)

It will also describe which thermal parameter to use when.

Regards

Ishaan

Power management

Power management forum

UA78: UA7824