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TPS54122 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS54122 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 40 page 0.001 0.01 0.1 1 10 100 1k 10k 100k 1M 10M Frequency (Hz) Cnr = 0.01 µF Cnr = 0.1 µF Cnr = 1 µF C018 -0.02 -0.015 -0.01 -0.005 0 0.005 2 3 4 5 6 7 8 9 10 Time (25 µs/div) C014 V OUT Deviation V VIN 3 V to 5V to 3 V (1 V/µs) 0.001 0.01 0.1 1 10 100 1k 10k 100k 1M 10M Frequency (Hz) Iout = 50 mA Iout = 500 mA Iout = 1.5 A Iout = 3 A C016 C018 0.001 0.01 0.1 1 10 100 1k 10k 100k 1M 10M Frequency (Hz) Cout = 22 µF Cout = 47 µF Cout= 122 µF C017 0 10 20 30 40 50 60 70 80 90 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 V LDOIN - VOUT (V) 1 kHz 100 kHz 1 MHz 10 MHz C023 0 10 20 30 40 50 60 70 80 90 100 10 100 1k 10k 100k 1M 10M Frequency (Hz) 500 mA 1.5 A 3 A C020 9 TPS54122 www.ti.com SBVS221B – NOVEMBER 2013 – REVISED AUGUST 2016 Product Folder Links: TPS54122 Submit Documentation Feedback Copyright © 2013–2016, Texas Instruments Incorporated Typical Characteristics (continued) At VVIN = VBIAS= VLDOEN= 5 V, VLDOIN = DC-DC_OUT = 2.1 V, VO = 1.8 V, IO = 50 mA, VEN = floating, COUT = 100 μF, and CSS = CNR = 0.01 µF (see Figure 27), unless otherwise noted. IO = 3 A Figure 7. LDO Power-Supply Ripple Rejection vs LDO Dropout Voltage Figure 8. LDO Power-Supply Ripple Rejection vs Frequency COUT = 122 µF, CNR = 1 µF, RMS noise = 100 Hz to 100 kHz, 50-mA IO = 9 µVRMS, 500-mA IO = 11 µVRMS, 1.5-A IO = 11 µVRMS, 3-A IO = 10 µVRMS Figure 9. Output Spectral Noise Density vs Frequency (LDO Powered by DC-DC) CNR = 1 µF, RMS noise = 100 Hz to 100 kHz, 22-µF COUT = 10 µVRMS, 47-µF COUT = 9 µVRMS, 122-µF COUT = 9 µVRMS Figure 10. Output Spectral Noise Density vs Frequency (LDO Powered by DC-DC) COUT = 122 µF, RMS noise = 100 Hz to 100 kHz, 0.01-µF CNR = 33 µVRMS, 0.1-µF CNR = 33 µVRMS, 1-µF CNR = 9 µVRMS Figure 11. Output Spectral Noise Density vs Frequency (LDO Powered by DC-DC) Figure 12. LDO Line Transient Response |
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