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UCC28600D Datasheet(PDF) 8 Page - Texas Instruments |
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UCC28600D Datasheet(HTML) 8 Page - Texas Instruments |
8 / 31 page C SS u ISS t SS(min)(due power limit) A CS(FB) V PL * VCS(os) t SS(min) + * RLOAD(ss)COUT 2 n 1 * V OUT * DVOUT(step) 2 R LOAD(ss)POUT(max)limit t SS(min) + C OUTVOUT 2 2 P LIM R ST2 + V BE(off) I STATUS(leakage) R ST1 + R ST2 VDD (uvlo*on) * V BE(sat) * RDS(on) I CC bsat * RDS(on)VBE(sat) I CC bsat R ST2 ) VBE(sat) UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com TERMINAL COMPONENTS (continued) TERMINAL I/O DESCRIPTION(1) (2) (3) NAME NO. where tSS(min) is the greater of: or SS 1 I (2) • RLOAD(ss) is the effective load impedance during soft-start (4) • ΔVOUT(step) is the allowed change in VOUT due to a load step (4) • POUT(max limit) Programmed power limit level, in W (4) • ACS(FB) is the current sense gain (5) • VCS(os) is the CS offset voltage (5) • ISS is the soft-start charging current (5) • VPL is the power limit threshold (5) STATUS 8 O where: • βSAT is the gain of transistor QST in saturation • VBE(sat) is the base-emitter voltage of transistor QST in saturation • VDD(uvlo-on) is the startup threshold (5) • ICC is the collector current of QST • ISTATUS(leakage) is the maximum leakage/off current of the STATUS pin (5) • VBE(off) is the maximum allowable voltage across the base emitter junction that will not turn QST on • RDS(on) is the RDS(on) of STATUS (5) (4) Refer to the UCC28600 Design Calculator (TI Literature Number SLVC104) or laboratory measurements for currents, voltages and times in the operational circuit. (5) Refer to the Electrical Characteristics Table for constant parameters. 8 Copyright © 2005–2011, Texas Instruments Incorporated |
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