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LM5118Q Datasheet(PDF) 6 Page - Texas Instruments |
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LM5118Q Datasheet(HTML) 6 Page - Texas Instruments |
6 / 37 page LM5118 SNVS566F – APRIL 2008 – REVISED OCTOBER 2011 www.ti.com Electrical Characteristics (continued) Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature range of -40°C to +125°C. Unless otherwise specified, the following conditions apply: VIN = 48V, VCCX = 0V, EN = 5V, RT = 29.11 k Ω, No load on LO and HO (1). Symbol Parameter Conditions Min Typ Max Units OSCILLATOR (RT PIN) fSW1 Frequency 1 RT = 29.11 k Ω 178 200 224 kHz fSW2 Frequency 2 RT = 9.525 k Ω 450 515 575 kHz SYNC Sync threshold falling 1.3 V CURRENT LIMIT VCS(TH) Cycle-by-cycle Sense Voltage RAMP = 0 Buck Mode -103 -125 -147 mV Threshold (CS-CSG) VCS(THX) Cycle-by-cycle Sense Voltage RAMP = 0 Buck-Boost Mode -218 -255 -300 mV Threshold (CS-CSG) CS Bias Current CS = 0V 45 60 µA CSG Bias Current CSG = 0V 45 60 µA Current Limit Fault Timer 256 cycles RAMP GENERATOR IR1 RAMP Current 1 VIN = 60V, VOUT = 10V 245 305 365 µA IR2 RAMP Current 2 VIN = 12V, VOUT = 12V 95 115 135 µA IR3 RAMP Current 3 VIN = 5V, VOUT = 12V 65 80 95 µA VOUT Bias Current VOUT = 48V 245 µA LOW SIDE (LO) GATE DRIVER VOLL LO Low-state Output Voltage ILO = 100 mA 0.095 0.14 0.23 V VOHL LO High-state Output Voltage ILO = -100 mA 0.25 V VOHL = VCC-VLO LO Rise Time C-load = 1 nF, VCC = 8V 16 ns LO Fall Time C-load = 1 nF, VCC = 8V 14 ns IOHL Peak LO Source Current VLO = 0V, VCC = 8V 2.2 A IOLL Peak LO Sink Current VLO = VCC = 8V 2.7 A HIGH SIDE (HO) GATE DRIVER VOLH HO Low-state Output Voltage IHO = 100 mA 0.1 0.135 0.21 V VOHH HO High-state Output Voltage IHO = -100 mA, 0.25 V VOHH = VHB-VOH HO Rise Time C-load = 1 nF, VCC = 8V 14 ns HO Fall Time C-load = 1 nF, VCC = 8V 12 ns IOHH Peak HO Source Current VHO = 0V, VCC = 8V 2.2 A IOLH Peak HO Sink Current VHO = VCC = 8V 3.5 A HB-HS Under Voltage Lock-out 3 V BUCK-BOOST CHARACTERISTICS Buck-Boost Mode Buck Duty Cycle (2) 69 75 80 % THERMAL TSD Thermal Shutdown Temp. 165 °C Thermal Shutdown Hysteresis 25 °C θJA Junction to Ambient 40 °C/W θJC Junction to Case 4 °C/W (2) When the duty cycle exceeds 75%, the LM5118 controller gradually phases into the Buck-Boost mode. 6 Submit Documentation Feedback Copyright © 2008–2011, Texas Instruments Incorporated Product Folder Links: LM5118 |
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