UC3848 データシートの表示（PDF） - Unisonic Technologies

部品番号

コンポーネント説明

メーカー

UC3848

HIGH PERFORMANCE CURRENT MODE CONTROLLERS

Unisonic Technologies 

UC3848

LINEAR INTEGRATED CIRCUIT

„ FUNCTIONAL DESCRIPTION(Cont.)

(7)Protection section (Cont.)

OLP

After soft-start phase end, IC will shutdown driver if over load state occurs for continual TD-OLP. OLP function will

not inactive during soft-start phase. OLP case as followed FIG. 6. The test circuit as followed FIG.8. TD-OLP=5.53×TSS.

OVP

There are two kinds of OVP circuits, the first OVP function are enabled only when VSS<VSS (DEACT) &

VFB>VFB(OLP) during soft-start phase. During above condition, driver will be shutdown if over voltage state occurs

(VCC>VOVP1) for continual a blanking time. The first OVP function will not inactive after soft-start phase. The second

OVP will shutdown the switching of the power MOSFET whenever VCC>VOVP2. The first OVP case as followed FIG.7.

The test circuit as followed FIG. 9.

FIG.6 OLP case

FIG.7 OVP case

FIG.8 OLP test circuit

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

FIG.9 OVP test circuit

8 of 11

QW-R103-033.F

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