LM5146-Q1: LM5146-Q1 OCP RILIM計算

Oscar Ye

Part Number: LM5146-Q1

在LM5146-Q1 SPEC中寫到

若使用RDS_ON,LM5416 IC內部裡面有個ILIM會有一個200uA給RDS(ON)

若使用RSENSE電阻,5416 IC內部裡面有個ILIM會有一個100uA給RSENSE

在PG.40的範例去計算R_ILIM的值,我去計算當Vin=85V的ΔI 及Vin=14V的ΔI, 再去算流過RDS_ON上的跨壓, 利用公式算出R_{ILIM ,}但用公式去計算與範例的R_ILIM=619 Ohm差異很大,以範例電路圖中的R_ILIM=619 Ohm * 200uA=0.1238V, 以0.1238V+(-9.8944A)*10 m Ohm=0.12281V,電路一開機就進入OCP保護了,想問這邊的R_ILIM=619 Ohm怎麼算的

over 6 years ago

0 Timothy Hegarty over 6 years ago

TI__Guru 65997 points

Duplicate thread - closing this one out.

0 Oscar Ye over 6 years ago in reply to Timothy Hegarty

Prodigy 40 points

並沒有回答到範例的RILIM與實際算起來不符合的問題

0 Wei-Hao Chen (TW-FAE) over 6 years ago in reply to Timothy Hegarty

TI__Expert 3260 points

Hi Tim,

Please update your feedback to this tread: e2e.ti.com/.../2767542

Thanks a lot.

Wei-Hao

0 Wei-Hao Chen (TW-FAE) over 6 years ago in reply to Wei-Hao Chen (TW-FAE)

TI__Expert 3260 points

Hi Oscar,

問題會直接轉接到這個Link: e2e.ti.com/.../2767542

謝謝您。

Best Regards,

Wei-Hao

0 Timothy Hegarty over 6 years ago in reply to Wei-Hao Chen (TW-FAE)

TI__Guru 65997 points

Hi Oscar,

As Wei-Hao mentioned, this question is addressed at the link he provided. If it's okay, I'll go ahead and close out this thread.

Regards,
Tim

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LM5146-Q1: LM5146-Q1 OCP RILIM計算