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TPS51220 Datasheet(PDF) 5 Page - Texas Instruments |
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TPS51220 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 37 page www.ti.com TPS51220 SLVS785 – OCTOBER 2007 ELECTRICAL CHARACTERISTICS (continued) over operating free-air temperature range, EN = 3.3V, VIN = 12V, V5SW = 5V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT CURRENT AMPLIFIER TRIP = 0V/2V, CSN = 5V, TA = 25°C (2) 3.333 GC Gain TRIP = 3.3V/5V, CSN = 5V, TA = 25°C (2) 1.667 Common mode Input VIC 0 13 V Voltage Range Differential Input Voltage VID TA = 25°C –75 75 mV Range POWERGOOD PG in from lower 92.5% 95% 97.5% V(THPG) PG threshold PG in from higher 102.5% 105% 107.5% PG hysteresis 5% I(PG) PG sink Current PGOOD = 0.5 V 5 mA t(PGDLY) PGOOD Delay Delay for PG in 0.8 1 1.2 ms SOFTSTART t(SSDYL) Soft Start Delay Delay for Soft Start, ENx = Hi to SS-ramp starts 140 μs t(SS) Soft Start Time Internal Soft Start 800 μs FREQUENCY AND DUTY CONTROL f(SW) Switching Frequency Rf = 330 k Ω 273 303 333 kHz Lo to Hi 0.7 1.3 2 V V(THRF) RF Threshold Hysteresis 0.2 V Sync Input Frequency f(SYNC) 200 1000 kHz Range(2) tONmin Minimum On Time V(DRVH) = 90% to 10%, No Load 120 150 ns tOFFmin Minimum Off Time V(DRVH) = 10% to 90%, No Load 290 440 ns DRVH-off to DRVL-on 10 30 50 ns tD Dead time DRVL-off to DRVH-on 30 40 70 ns V(DTH) DRVH-off threshold DRVH to GND (2) 1 V V(DTL) DRVL-off threshold DRVL to GND(2) 1 V OUTPUT DRIVERS Source, V(VBST-DRVH) = 0.1 V 1.7 5 R(DRVH) DRVH resistance Ω Sink, V(DRVH-SW) = 0.1 V 1 3 Source, V(VREG5-DRVL) = 0.1 V 1.3 4 R(DRVL) DRVL resistance Ω Sink, V(DRVL-GND) = 0.1 V 0.7 2 CURRENT SENSE TRIP = 0V/2V, TA = 25°C 27 31 35 Current limit threshold V(OCL-ULV) (ultra-low voltage) TRIP = 0V/2V 25 31 37 mV TRIP = 3.3V/5V, TA = 25°C 56 60 64 Current limit threshold V(OCL-LV) (low voltage) TRIP = 3.3V/5V 54 60 66 Zero cross detection V(ZC) 0.95V < CSNx < 12.6V –4 0 4 mV comparator Offset Negative current limit TRIP = 0V/2V, TA = 25°C –24 –31 –38 V(OCLN-ULV) threshold TRIP = 0V/2V –22 –31 –40 (ultra-low voltage) mV Negative current limit TRIP = 3.3V/5V, TA = 25°C –51 –60 –69 V(OCLN-LV) threshold TRIP = 3.3V/5V –49 –60 –71 (low voltage) (2) Specified by design. Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Link(s) :TPS51220 |
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