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UC3848G-S08-R Datasheet(PDF) 8 Page - Unisonic Technologies

Part No. UC3848G-S08-R
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3848G-S08-R Datasheet(HTML) 8 Page - Unisonic Technologies

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UC3848
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
8 of 11
www.unisonic.com.tw
QW-R103-033.F
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
FIG.9 OVP test circuit


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