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U3848C-S08-T Datasheet(PDF) 7 Page - Unisonic Technologies |
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U3848C-S08-T Datasheet(HTML) 7 Page - Unisonic Technologies |
7 / 13 page U3848/A/B/C LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 7 of 13 www.unisonic.com.tw QW-R103-033,B FUNCTIONAL DESCRIPTION The internal reference voltages and bias circuit work at VCC>12.6V, and shutdown at VCC< 8.1V. (1) Soft-Start When every IC power on, driver output duty cycle will be decided by voltage VSS on soft-start capacitor and VCS on current sense resistor at beginning. After VSS reach 5.1V, the whole soft-start phase end, and driver duty cycle depend on VFB and VCS. The relation among VSS, VFB and VOUT as followed FIG.3, here soft-start phase Tsoft-start should more than VOUT start-up phase Tstart-up, otherwise, IC will enter false OLP protection state. Because after the soft-start phase end, if VOUT remain in lower voltage, VFB more than 4.6V, then IC enter false OLP state. Furthermore, soft-start phase should end before VCC reach VCC(MIN) during VCC power on. Otherwise, if soft-start phase remain not end before VCC reach VCC(MIN) during VCC power on, IC will enter auto-restart phase and not set up VOUT. Finally soft-start also set OVP active phase. OVP active phase between VSS=0 and VSS=3.8V, OVP will not be sensed after VSS reach 3.8V.The Soft-start phase TSS: 6 ms (CSS=0.05uF) TSS = 12 ms (CSS=0.1uF) 120 ms (CSS=1uF) t VOUT VFB t t Driver 4.6V TSTRAT-UP VSS t 5.1V TSOFT-START FIG.3 Soft-start phase |
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