TPS62813-Q1: life span estimation

Elec Cheng

Part Number: TPS62813-Q1

Hi Expert,

Please help to estimate TPS62813-Q1 life span with below working condition. The OEM requires 15years /300k km life span. Please help evaluate if we can meet this requirement. Thanks.

ITEM	TIME(HOUR)
Engine on	8000
Charging	13350
Self-checking	3000
Total Lifetime	24350

Temperature(℃)	Distribution(%)
Temperature(℃)	Engine on	Charging	Self-Checking
-40	6	6	6
23	20	64	64
42	65	25	25
80	8	4	4
85	1	1	1

BR,

Elec Cheng

over 1 year ago

0 Stefano Panaro over 1 year ago

TI__Expert 7585 points

Hi Elec,

We need to know power losses / junction temperature to perform the computation.

Can the customer provide more info on this application?

The main requirements are: FPWM or PFM, VIN, VOUT, IOUT, Fsw.

Thanks,

Stefano

0 Elec Cheng over 1 year ago in reply to Stefano Panaro

TI__Expert 7055 points

Hi Stefano,

Please refer to below schematic. Let me know if you need more info. Thanks.

BR,

Elec Cheng

0 Stefano Panaro over 1 year ago in reply to Elec Cheng

TI__Expert 7585 points

HI Elec,

Thanks for the data.

We will look into it and come back at you middle next week.

Thanks,

Stefano

0 Elec Cheng over 1 year ago in reply to Stefano Panaro

TI__Expert 7055 points

Hi Stefano,

Add info. Could you please help to check the life span? Thanks.

TPS62813-Q1
Temperature(℃)	Junction-to-ambient thermal resistance R_θJA °C/W	Input voltage（V）			Output Voltage（V)	Output Current（A）	Junction Temperature(℃)	Time/H	Ratio
Temperature(℃)	Junction-to-ambient thermal resistance R_θJA °C/W	MIN	TYP	MAX	Output Voltage（V)	Output Current（A）	Junction Temperature(℃)	Time/H	Ratio
-40	71.1	6	12	18	3.3	2	-11.2	1461	6.00%
23	71.1	6	12	18	3.3	2	51.8	12064	49.54%
42	71.1	6	12	18	3.3	2	70.8	9287.5	38.14%
80	71.1	6	12	18	3.3	2	108.8	1294	5.31%
85	71.1	6	12	18	3.3	2	113.8	243.5	1.00%

0 Stefano Panaro over 1 year ago in reply to Elec Cheng

TI__Expert 7585 points

HI Elec,

Thanks for the additional data.

Let's move this discussion offline.

I will send you an email.

Thanks,

Stefano

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TPS62813-Q1: life span estimation