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TPS51275B-1RUKT Datasheet(PDF) 7 Page - Texas Instruments |
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TPS51275B-1RUKT Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 31 page  TPS51275B-1 www.ti.com SLVSCT3 – MARCH 2015 Electrical Characteristics (continued) over operating free-air temperature range, VVIN = 12 V, VVO1 = 5 V, VVFB1 = VVFB2 = 2 V, VEN1 = VEN2 = 3.3 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT UVLO Wake up 4.58 VUVL0VIN VIN UVLO threshold V Hysteresis 0.5 Wake up 4.38 4.5 VUVLO5 VREG5 UVLO threshold V Hysteresis 0.4 Wake up 3.15 VUVLO3 VREG3 UVLO threshold V Hysteresis 0.15 OVERTEMPERATURE PROTECTION Shutdown temperature 155 TOTP OTP threshold(1) °C Hysteresis 10 7.6 Timing Requirements over operating free-air temperature range, VVIN = 12 V, VVO1 = 5 V, VVFB1 = VVFB2 = 2 V, VEN1 = VEN2 = 3.3 V (unless otherwise noted) MIN NOM MAX UNIT DUTY CYCLE AND FREQUENCY CONTROL fsw1 CH1 frequency(1) TA = 25°C, VVIN= 20 V 240 300 360 kHz fSW2 CH2 frequency(1) TA = 25°C, VVIN= 20 V 280 355 430 kHz tOFF(MIN) Minimum off-time TA = 25°C 200 300 500 ns MOSFET DRIVERS DRVH-off to DRVL-on 12 tD Dead time ns DRVL-off to DRVH-on 20 (1) Ensured by design. Not production tested. 7.7 Switching Characteristics over operating free-air temperature range, VVIN = 12 V, VVO1 = 5 V, VVFB1 = VVFB2 = 2 V, VEN1 = VEN2 = 3.3 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT CLOCK OUTPUT fCLK Clock frequency TA = 25°C 260 kHz SOFT-START OPERATION From ENx = HI and VVREG5 > tSS Soft-start time 3.25 ms VUVLO5 to VOUT = 95% VOUT= 0% to VOUT = 95%, VVREG5 = tSSRAMP Soft-start time (ramp-up) 3.12 ms 5 V POWER GOOD From PG lower threshold (95% = tPGDEL PG delay 1.38 ms typical) to PG flag high OUTPUT OVERVOLTAGE PROTECTION tOVPDLY OVP propagation delay TA = 25°C 0.5 µs OUTPUT UNDERVOLTAGE PROTECTION tUVPDLY UVP propagation delay 250 µs From ENx = HI and VVREG5 > tUVPENDLY UVP enable delay 4.3 ms VUVLO5 to UV latch off Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: TPS51275B-1 |
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