LM5160A: Lm5160A

Nobel.wo

Part Number: LM5160A
Other Parts Discussed in Thread: LM5160

How can the internal MOSFET switching and driving losses of the LM5160A be estimated, or where are they specified in the datasheet?

2 个月前

0 Vivian Gao 2 个月前

TI__Expert 7590 points

The RDS has already been provided in the data sheet(www.ti.com/.../lm5160a.pdf), and combined with the Power Dissipated in the MOSFET chapter in the following Application Report for calculation.

www.ti.com/.../slva390a.pdf

0 Nobel.wo 2 个月前

Prodigy 120 points

When LM5160 is used (400kHz switching frequency), the IC temperature is static at 44℃ under 55V input voltage; 0.12A load working, IC temperature 52℃; May I ask why the temperature is so high?

0 Vivian Gao 2 个月前回复 Nobel.wo

TI__Expert 7590 points

You can calculate the junction temperature according to the data sheet.

The overheating of the chip may be due to poor heat dissipation design, inaccurate load current evaluation, low efficiency of the switching power supply, and high MOSFET losses

0 Nobel.wo 1 个月前

Prodigy 120 points

Why is the case temperature measured by the temperature gun very close to the junction temperature calculated in the LM5160 datasheet ？

0 Nobel.wo 1 个月前回复 Nobel.wo

Prodigy 120 points

Use this formula

0 Vivian Gao 1 个月前回复 Nobel.wo

TI__Expert 7590 points

If you calculate that the temperature of the chip exceeds the junction temperature, it may be a design issue.

You can use webench to redesign your circuit

www.ti.com/.../LM5160A

If the temperature still exceeds the standard, it is recommended to use TI's evaluation board for testing first.

0 Nobel.wo 1 个月前回复 Vivian Gao

Prodigy 120 points

The calculated junction temperature is close to the measured case temperature, and the temperature does not exceed the standard.Shouldn't the junction temperature be greater than the shell temperature

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LM5160A: Lm5160A