LM5170-Q1: LM5170 dual-channel current is different at low temperature

user44411751

Part Number: LM5170-Q1
Other Parts Discussed in Thread: LM5170

LM5170-Q1 dual-channel output current is not equal at low temperature -20°~-40°, one channel current is 44A, the others is 40A, but I set the same current by software. The two channels are the same current or too much difference in normal. The data as below:

standard	44A -ISET(Iout1)	44A -ISET(Iout2)
25	44.56445313	43.67578125
-20	44.29785156	42.52050781
-37	45.54199219	40.4765625
-37	44.7421875	40.4765625
-35	44.65332031	40.74316406
-37	44.38671875	40.83203125

over 6 years ago

0 Richard Fu22 over 6 years ago

TI__Mastermind 31315 points

Hi User,

Thank you for using the LM5170 in your design. Can you attach a schematic for review?

Thanks,

Richard

0 user44411751 over 6 years ago in reply to Richard Fu22

Intellectual 940 points

Is any effect in low temperature? Do we need to adjust the parameters in low temperature?

0 Garrett Roecker over 6 years ago in reply to user44411751

TI__Mastermind 21720 points

Hello,

There is no need to adjust component selection at cold temperatures while using the LM5170. There might be an external component (current sense resistor) that is changing over the temperature range specified. This could be causing the imbalance between phases. Also, Please let us know how you are measuring the current? It is possible that there is some measurement error.

As Richard mentioned can you please provide the schematic? This would help us to understand what might be occurring.

Please let me know if you have any questions.

Thanks,

Garrett

Power management

Power management forum

LM5170-Q1: LM5170 dual-channel current is different at low temperature