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LM5045 Datasheet(PDF) 6 Page - Texas Instruments |
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LM5045 Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 38 page  LM5045 SNVS699G – FEBRUARY 2011 – REVISED MARCH 2013 www.ti.com Electrical Characteristics (continued) Limits in standard typeface are for TJ = 25°C only; limits in boldface type apply the junction temperature range of -40°C to +125°C. Unless otherwise specified, the following conditions apply: VIN = 48V, RT = 25k Ω, RD1=RD2=20kΩ. No load on HO1, HO2, LO1, LO2, SR1, SR2, COMP=0V, UVLO=2.5V, OVP=0V, SSOFF=0V. Symbol Parameter Conditions Min Typ Max Units VREF REF Voltage IREF = 0mA 4.85 5 5.15 V REF voltage regulation IREF = 0 to 10mA 25 50 mV IREF(Lim) REF current limit VREF = 4.5V 15 20 mA VREFUV VREF under-voltage threshold Positive going VREF 4.3 4.5 4.7 V Hysteresis 0.25 V Under-Voltage 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<1.25V Under-voltage 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>1.25V 16 20 24 µA Soft-Start (SS Pin) ISS SS charge current VSS = 0V 16 20 24 µA SS threshold for SSSR charge current ICOMP<800µA 1.93 2.0 2.20 V enable SS output low voltage Sinking 100µA 40 mV SS threshold to disable switching 200 mV ISSSR SSSR charge current VSS>2V, ICOMP<800µA 16 20 24 µA ISSSR-DIS1 SSSR discharge current 1 VUVLO<1.25V 54 65 75 µA ISSSR-DIS2 SSSR discharge current 2 VRES>1V 109 125 147 µA SSSR output low voltage Sinking 100µA 50 mV SSSR threshold to enable SR1/SR2 1.2 V Current Sense Input (CS Pin) VCS Current limit threshold 0.710 0.750 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) VIH(min) SSOFF Input-threshold 2.8 V SSOFF pull down resistance 200 k Ω Current Limit Restart (RES Pin) RRES RES pull-down resistance Termination of hiccup timer 37 Ω VRES RES hiccup threshold 1 V RES upper counter threshold 4 V RES lower counter threshold 2 V IRES-SRC1 Charge current source 1 VRES<1V,VCS>750mV 30 µA IRES-SRC2 Charge current source 2 1V<VRES<4V 10 µA IRES-DIS2 Discharge current source 1 VCS<750mV 5 µA IRES-DIS2 Discharge current source 2 2V<VRES<4V 5 µA Ratio of time in hiccup mode to time VRES>1V, Hiccup counter 147 in current limit Voltage Feed-Forward (RAMP Pin) RAMP sink impedance (Clocked) 5.5 20 Ω 6 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Product Folder Links: LM5045 |
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