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TPS715A33DRBR Datasheet(PDF) 11 Page - Texas Instruments |
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TPS715A33DRBR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 26 page t - Time - ms -0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 100 50 0 200 0 -200 V IN = 4.3 V V OUT = 3.3 V C OUT = 10 F m 18 16 14 12 VIN VOUT VOUT = 3.3 V RL = 66 W COUT = 10 F m 8 7 6 5 4 3 2 1 0 t − Time − ms 2 0 6 4 10 8 20 t − Time − ms 0 150 100 50 200 250 350 300 400 450 500 5.3 VOUT = 3.3 V IOUT = 50 mA COUT = 10 F m 4.3 100 50 0 −50 R = DS(ON) V DO I RATED 11 TPS715A www.ti.com SBVS047H – MAY 2004 – REVISED MARCH 2016 Product Folder Links: TPS715A Submit Documentation Feedback Copyright © 2004–2016, Texas Instruments Incorporated 8.2.1.2.2 Dropout Voltage (VDO) Generally speaking, the dropout voltage often refers to the voltage difference between the input and output voltage (VDO = VIN – VOUT). However, in the Electrical Characteristics table, VDO is defined as the VIN – VOUT voltage at the rated current, where the pass-FET is fully enhanced in the ohmic region of operation and is characterized by the classic RDS(on) of the FET. VDO indirectly specifies a minimum input voltage above the nominal programmed output voltage at which the output voltage is expected to remain within its accuracy boundary. If the input falls below this VDO limit (VIN < VOUT + VDO), then the output voltage decreases to follow the input voltage. Dropout voltage is always determined by the RDS(on) of the main pass-FET. Therefore, if the LDO operates below the rated current, then the VDO for that current scales accordingly. RDS(on) can be calculated using Equation 1. (1) 8.2.1.3 Application Curves Figure 17. Power-Up and Power-Down Figure 18. Line Transient Response Figure 19. Load Transient Response |
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