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LM5045 Datasheet(PDF) 7 Page - Texas Instruments |
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LM5045 Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 46 page  LM5045 www.ti.com SNVS699H – FEBRUARY 2011 – REVISED JANUARY 2015 6.5 Electrical Characteristics Limits in standard typeface are for TJ = 25°C only; MIN and MAX limits apply the junction temperature range of –40°C to 125°C. Unless otherwise specified, the following conditions apply: VIN = 48 V, RT = 25 kΩ, RD1 = RD2 = 20 kΩ. No load on HO1, HO2, LO1, LO2, SR1, SR2, COMP = 0 V, UVLO = 2.5 V, OVP = 0 V, SSOFF = 0 V. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT START-UP REGULATOR (VCC PIN) VCC1 VCC voltage ICC= 10 mA (SSSR < 1 V) 9.3 9.6 9.9 V VCC2 VCC voltage ICC= 10 mA (SSSR > 1 V) 7.5 7.8 8.1 V ICC(Lim) VCC current limit VCC= 6 V 60 80 mA ICC(ext) VCC supply current Supply current into VCC from an 4.6 mA externally applied source. VCC = 10 V VCC load regulation ICC from 0 to 50 mA 35 mV VCC(UV) VCC undervoltage threshold Positive going VCC VCC1–0.2 VCC1–0.1 V Negative going VCC 5.9 6.3 6.7 V IIN VIN operating current 4 mA VIN shutdown current VIN = 20 V, VUVLO = 0 V 300 520 µA VIN = 100 V, VUVLO = 0 V 350 550 µA VIN start-up regulator leakage VCC=10 V 160 µA VOLTAGE REFERENCE REGULATOR (REF PIN) VREF REF voltage IREF = 0 mA 4.85 5 5.15 V REF voltage regulation IREF = 0 to 10 mA 25 50 mV IREF(Lim) REF current limit VREF = 4.5 V 15 20 mA VREFUV VREF undervoltage threshold Positive going VREF 4.3 4.5 4.7 V Hysteresis 0.25 V UNDERVOLTAGE LOCK OUT AND SHUTDOWN (UVLO PIN) VUVLO Under-voltage threshold 1.18 1.25 1.32 V IUVLO Hysteresis current UVLO pin sinking current when 16 20 24 µA VUVLO < 1.25 V Undervoltage standby enable UVLO voltage rising 0.32 0.4 0.48 V threshold Hysteresis 0.05 V VOVP OVP shutdown threshold OVP rising 1.18 1.25 1.32 V OVP hysteresis current OVP sources current when OVP > 16 20 24 µA 1.25 V SOFT-START (SS PIN) ISS SS charge current VSS = 0 V 16 20 24 µA SS threshold for SSSR charge current ICOMP < 800 µA 1.93 2 2.2 V enable SS output low voltage Sinking 100 µA 40 mV SS threshold to disable switching 200 mV ISSSR SSSR charge current VSS > 2 V, ICOMP < 800 µA 16 20 24 µA ISSSR-DIS1 SSSR discharge current 1 VUVLO < 1.25 V 54 65 75 µA ISSSR-DIS2 SSSR discharge current 2 VRES > 1 V 109 125 147 µA SSSR output low voltage Sinking 100 µA 50 mV SSSR threshold to enable SR1/SR2 1.2 V CURRENT SENSE INPUT (CS PIN) VCS Current limit threshold 0.71 0.75 0.785 V CS delay to output 65 ns CS leading edge blanking 50 ns RCS CS sink impedance (clocked) Internal FET sink impedance 18 45 Ω SOFT-STOP DISABLE (SS OFF PIN) Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM5045 |
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