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TPS54312MPWPREP Datasheet(PDF) 10 Page - Texas Instruments |
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TPS54312MPWPREP Datasheet(HTML) 10 Page - Texas Instruments |
10 / 21 page www.ti.com PERFORMANCE GRAPHS −30 −15 0 30 45 60 100 1 k 10 k 100 k 1 M −90 −45 0 45 90 180 f − Frequency − Hz LOOP RESPONSE Gain Phase 15 135 50 60 70 80 90 100 0 1 2 3 4 5 Load Current − A EFFICIENCY vs LOAD CURRENT 3.3 VI 5 VI Efficiency at 700 kHz 1.7 1.75 1.8 1.85 1.9 0 1 2 3 4 5 IL − Load Current − A OUTPUT VOLTAGE vs LOAD CURRENT 3.3 VI 5 VI VI 2 V/div VO 2 V/div VPWRGD 5 V/div START-UP WAVEFORMS Time − 2 ms/div VO (AC) 10 mV/div VI = 5 V IO = 3 A 400 ns/div OUTPUT RIPPLE VOLTAGE Time − 100 µs/div VO 50 mV/div LOAD TRANSIENT RESPONSE IO 2 A/div Time − 10 µs/div 75 55 35 0 1 2 85 95 AMBIENT TEMPERATURE vs LOAD CURRENT 125 3 4 115 45 25 65 105 IL − Load Current − A Safe Operating Area† † Safe operating area is applicable to the test board conditions listed in the Dissipation Rating Table section of this data sheet. DETAILED DESCRIPTION Under Voltage Lock Out (UVLO) TPS54311-EP, TPS54312-EP, TPS54313-EP, TPS54314-EP, TPS54315-EP, TPS54316-EP SGLS376A – FEBRUARY 2007 – REVISED MARCH 2007 Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. The TPS54311-16 incorporates an under voltage lockout circuit to keep the device disabled when the input voltage (VIN) is insufficient. During power up, internal circuits are held inactive until VIN exceeds the nominal UVLO threshold voltage of 2.95 V. Once the UVLO start threshold is reached, device start-up begins. The device operates until VIN falls below the nominal UVLO stop threshold of 2.8 V. Hysteresis in the UVLO comparator, and a 2.5- µs rising and falling edge deglitch circuit reduce the likelihood of shutting the device down due to noise on VIN. 10 Submit Documentation Feedback |
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