LM5022: LM5022 design questions

Chun Youngsu

Part Number: LM5022

Hi. TI

We confirmed the simulation of LM5022 with WEBENCH Designer with Vin6 ~ 12V / output voltage 13V consumption current 6A.

Webbench designed the following methods.
1. Vin (min) 6V / Max 6V --> Vout 13V / Iout : 2A
2. Vin (min) 11V ~ 12V --> Vout : 13V /  Iout : 6A

We designed the attached circuit by combining the above two designs and performed the test.

I tried to implement the circuit, but only about 2A current was driven.

Could you give me a circuit review?

The specifications we need are Vin 7V ~ 12V / Vout: 13V / Iout: Max6A

Thanks.

over 8 years ago

0 EricLee over 8 years ago

TI__Guru 58171 points

Hello
It seems your current sense resistor value is too big. Please double check. Is it 0.5 ohm ?
Thanks

0 Chun Youngsu over 8 years ago in reply to EricLee

Expert 2485 points

Hi. EricLee

Sorry.

Current sense resistor value is 0.05ohm.

Thanks.

0 EricLee over 8 years ago in reply to Chun Youngsu

TI__Guru 58171 points

Hello

Please short R5 and see if any improvement.

Thanks

0 Chun Youngsu over 8 years ago in reply to EricLee

Expert 2485 points

Hi EricLee

With your help, the output current is normally implemented.

Thank you.

However, during the test, the difference in current due to the input voltage is too large as shown below.

Can you tell me the points for linear debugging?

Input Volt Output Load Ampere Output Volt
4V X 4.5V
5V X 4.5V
6V 1.8A 11.1V
7V 1.4A 11V
8V 1A 11V
9V 2A 11V
10V 2A 11V
11V 6A 11.5V
12V 7A 12.4V

Thanks.

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LM5022: LM5022 design questions