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LM5045 Datasheet(PDF) 9 Page - Texas Instruments |
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LM5045 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 46 page  LM5045 www.ti.com SNVS699H – FEBRUARY 2011 – REVISED JANUARY 2015 Electrical Characteristics (continued) 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 SYNCHRONOUS RECTIFIER TIMING CONTROL (RD1 and RD2 PINS) T1 SR trailing edge delay RD1 = 20 kΩ 45 65 90 ns SR turnoff 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 turnoff to SR turnon RD2 = 100 kΩ 227 300 384 ns COMP PIN VPWM-OS COMP current to RAMP offset VRAMP = 0 V 680 800 940 µA VSS-OS SS to RAMP offset VRAMP = 0 V 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 > 2 V 690 800 915 µA current enable COMP to output delay 120 ns Minimum duty cycle ICOMP = 1 mA 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 = 100 mA 0.16 0.32 V VOH High-state output voltage IHO/LO = 100 mA 0.27 0.495 VOHL = VCC – VLO V VOHH = VBST – VHO Rise Time C-load = 1000 pF 16 ns Fall Time C-load = 1000 pF 11 ns IOHL Peak Source Current VHO/LO = 0 V 1.5 A IOLL Peak Sink Current VHO/LO = VCC 2 A SR1, SR2 GATE DRIVERS VOL Low-state output voltage ISR1/SR2 = 10 mA 0.05 0.1 V VOH High-state output voltage ISR1/SR2 = 10 mA, 0.17 0.28 V VOH = VREF – VSR Rise Time C-load = 1000 pF 60 ns Fall Time C-load = 1000 pF 20 ns IOHL Peak Source Current VSR = 0 V 0.1 A IOLL Peak Sink Current VSR = VREF 0.4 A THERMAL SHUTDOWN TSD Thermal Shutdown Temp 160 °C Thermal Shutdown Hysteresis 25 °C Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM5045 |
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