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U3848AL-S08-R Datasheet(PDF) 9 Page - Unisonic Technologies |
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U3848AL-S08-R Datasheet(HTML) 9 Page - Unisonic Technologies |
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9 / 13 page  U3848/A/B/C LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 9 of 13 www.unisonic.com.tw QW-R103-033,B FUNCTIONAL DESCRIPTION(Cont.) (3) Protection section U3848/A/B/C takes on more protection functions such as OLP, OVP and OTP etc. In case of those failure modes for continual 7.2µs (blanking time), the driver is shut down. At the same time, IC enters auto-restart, VCC power on and driver is reset after VCC power on again. OLP After soft-start phase end (VSS>5.1V), IC will shutdown driver if over load state occurs (corresponding to VFB>4.6V) for continual 7.2µs. OLP function will not inactive during soft-start phase. OLP case as followed FIG.6. The test circuit as followed FIG.8 for U3848/A/B/C. VCC VOUT VFB VSS t t t t 5.1V 4.6V 8.1V 12.6V 7.2µs Blanking 7.2µs Blanking SS Phase VCC Driver ON/OFF VFB VSS t t t t 5.1V 4.6V 8.1V 12.6V 7.2µs Blanking 7.2µs Blanking SS Phase Trestart 16V 3.9V OVP Phase FIG.6 OLP case FIG.7 OVP case OVP Power supply VCC’s OVP function are enabled only when VSS<3.9V & VFB>4.6V during soft-start phase. During above condition, driver will be shutdown if over voltage state occurs (VCC>16V) for continual 7.2µs. OVP function will not inactive after soft-start phase. OLP case as followed FIG.7. The test circuit as followed FIG.9 for U3848/A/B/C. OTP OTP will shut down driver when junction temperature TJ of internal circuits is more than threshold 135°C for continual 7.2µs. |
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