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XC9220A095EL Datasheet(PDF) 7 Page - Torex Semiconductor |
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XC9220A095EL Datasheet(HTML) 7 Page - Torex Semiconductor |
7 / 22 page 7/22 XC9220/XC9221 Series <Soft-Start Time> The XC9220/XC9221B and D series can adjust the soft-start time externally via the CE pin. The soft-start function operates until the CE pin voltage becomes 2.6V. Please refer to the following equation for calculating the soft-start time. Minimum soft-start time is equal to the time set internally. TSS= - CSS x RSS x In { (VCE – 2.2) / VCE } CE/CSS PIN VCE Rss Css CE/CSS PIN VCE Rss Css ON/OFF Signal > Circuit Examle2 : CMOS logic (low current dissipation) CE/CSS PIN VCE Rss Css ON/OFF Signal > Cicuit Examle3 : CMOS logic (low current dissipation, quick off) > Circuit Example1 : N-ch Open Drain CE/CSS PIN VCE Rss Css ON/OFF Signal Internal sotf-starttime:Tss1 (XC9220/21A series) Externallyset soft-starttime:Tss2 (XC9220/21A series) Minimum soft-start time when externallyset: Tss2_min =Tss1 XC9220/21A series XC9220/21B series <U.V.L.O. (Under Voltage Lock Out) > When the input voltage becomes 2.3V (TYP.) or lower, the external P-channel driver transistor is forced OFF. Once the U.V.L.O. operates, the XC9220/XC9221A and C series (soft-start internally set type) resets the internal circuit. For this, by releasing the U.V.L.O. function, the IC performs the soft-start function to initiate output startup operation. When the input voltage falls because of a power cutoff etc. and the IC stops operation due to the U.V.L.O. function, the IC resumes its operation by internal soft-start circuit of the XC9220/XC9221B and D series. If the soft-start time is needed to set externally, the CE/CSS pin voltage should be reset to 0V. (Please see the soft-start circuit example.) ●U.V.L.O. Operation VIN U.V.L.O. ( InternalSignal) VOUT (XC9220/21A and C series) VOUT (XC9220/21B and D series) U.V.L.O. release delay Soft-start time: Tss1 U.V.L.O. operation U.V.L.O. release delay Soft-start time (Externally set-up) :Tss2 Soft-start time:Tss1 ■OPERATIONAL EXPLANATION (Continued) |
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