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TPS61040: On-load voltage drawdown problem of TPS61040DBVR

WEI MA
Prodigy 80 points
Part Number: TPS61040

problem description

The output load capacity is insufficient

experimental apparatus

electronic load（IT8510）

design objective

Input：5V

Output:  8V 0.3A

 

experimental data

1. testing environment

 

voltage（V）

load current（A）

Chip temperature（℃）

temperature rise（℃）

8.03

0.002

 

 

7.99

0.050

 

 

7.98

0.100

25

3

7.83

0.200

 

 

7.03

0.250

30

8

6.08

0.301

 

 

5.38

0.350

32.4

10.4

4.97

0.4

 

 

 

 

 

Load depressurization question

 

Principle diagram:

PCB placement：

  • 0
    TI__Expert 8270 points

    Hi Wei,

    The guaranteed peak current limit of TPS61040 is 350mA. So when the Iout exceeds around 200mA in a 5V to 8V application, the inductor current has been limited already.

    That means no enough input power be delivered to the Vout. As the Iload increases further, the Vout will be pulled down lower.

    Regards

    Lei