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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 / 38 page  LM5045 www.ti.com SNVS699G – FEBRUARY 2011 – REVISED MARCH 2013 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 Oscillator (RT Pin) FSW1 Frequency (LO1, half oscillator RT = 25 kΩ 185 200 215 kHz frequency) FSW2 Frequency (LO1, half oscillator RT = 10 kΩ 420 480 540 kHz frequency) DC level 2.0 V RT sync threshold 2.8 3 3.3 V Synchronous Rectifier Timing Control (RD1 & RD2 Pins) T1 SR trailing edge delay RD1=20 kΩ 45 65 90 ns SR turn-off to HO&LO both on RD1=100 kΩ 232 300 388 ns T2 SR leading edge RD2=20 kΩ 43 65 90 ns HO or LO turn-off to SR turn-on RD2=100 kΩ 227 300 384 ns Comp Pin VPWM-OS COMP current to RAMP offset VRAMP=0V 680 800 940 µA VSS-OS SS to RAMP offset VRAMP=0V 0.78 1.0 1.22 V COMP current to RAMP gain ΔRAMP/ΔICOMP 2400 Ω SS to RAMP gain ΔSS/ΔRAMP 0.5 COMP current for SSSR charge VSS > 2V 690 800 915 µA current enable COMP to output delay 120 ns Minimum duty cycle ICOMP = 1mA 0 % Slope Compensation (SLOPE Pin) ISLOPE Slope compensation current ramp Peak of RAMP current 100 µA BOOST (BST Pin) VBst uv BST under-voltage threshold VBST-VHS rising 3.8 4.7 5.6 V Hysteresis 0.5 V HO1, HO2, LO1, LO2 Gate Drivers VOL Low-state output voltage IHO/LO = 100mA 0.16 0.32 V VOH High-state output voltage IHO/LO = 100mA 0.27 0.495 V VOHL = VCC-VLO VOHH = VBST-VHO Rise Time C-load = 1000pF 16 ns Fall Time C-load = 1000pF 11 ns IOHL Peak Source Current VHO/LO = 0V 1.5 - A IOLL Peak Sink Current VHO/LO = VCC 2 - A SR1, SR2 Gate Drivers VOL Low-state output voltage ISR1/SR2 = 10mA 0.05 0.1 V VOH High-state output voltage ISR1/SR2 = 10mA, 0.17 0.28 V VOH = VREF-VSR Rise Time C-load = 1000pF 60 ns Fall Time C-load = 1000pF 20 ns IOHL Peak Source Current VSR = 0V 0.1 - A IOLL Peak Sink Current VSR = VREF 0.4 - A Thermal TSD Thermal Shutdown Temp 160 °C Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM5045 |
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