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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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LM2647 Fiches technique(PDF) 7 Page - Texas Instruments |
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LM2647 Fiches technique(HTML) 7 Page - Texas Instruments |
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7 / 42 page  LM2647 www.ti.com SNVS210F – JUNE 2003 – REVISED APRIL 2013 Electrical Characteristics (continued) Specifications with standard typeface are for TJ = 25°C, and those with boldface apply over full Operating Junction Temperature range. VDD = V5 = 5V, VSGND = VPGND = 0V, VIN = 15V, VEN = 3V, RFADJ = 22.1K unless otherwise stated. (1) Symbol Parameter Conditions Min(2) Typical(3) Max(2) Units Fault UVP Latch Threshold as a FB voltage falling below VFB_REG 65 70 75 % Percentage of Internal Reference ΔtFAULT Fault Delay From Fault detection (any output) 7 µs to Fault assertion Soft-start ISS_CHG Soft-start Charging Current VSS = 1V 8 11 14 µA RSS_DCHG Soft-shutdown Resistance (SS pin VEN = 0V, VSS = 1V 1800 Ω to SGND, either channel) ISS_DCHG Soft-start Discharge Current In Current Limit 80 115 160 µA VSS_RESET Soft-start pin reset voltage(4) SS charged to 0.5V, EN low to 100 mV high SS to COMP Offset Voltage VSS = 0.5V and 1V, VFB1 = VFB2 = 600 mV 0V Error Amplifier GAIN DC Gain 70 dB Voltage Slew Rate COMP rising 4.45 V/µs COMP falling 2.25 BW Unity Gain Bandwidth COMP falling 6.5 MHz COMP Source Current VFB < VFB_REG 2 5 mA VCOMP = 0.5V COMP Sink Current VFB > VFB_REG 7 14 mA VCOMP = 0.5V Current Limit and Zero-Cross IILIM ILIM Pin Current (sourcing, either VILIM1 = VILIM2 = 0V 46 62 76 µA ILIM pin) IILIM Threshold Voltage -10 0 10 mV VSW_ZERO Zero-cross Threshold (SW Pin) LDRV goes low -2.2 mV Osillator PWM Frequency RFADJ = 22.1kΩ 255 300 345 kHz RFADJ = 12.4kΩ 500 RFADJ = 30.9kΩ 200 PWM Ramp Peak-to-peak VIN = 15V 1.6 V Amplitude VIN = 24V 2.95 PWM Ramp Valley 0.8 V Frequency Change with VIN VIN = 5.5V to 24V ±1 % Frequency Change with VDD VDD = 4.5V to 5.5V ±2 % Phase Shift Between Channels Phase from HDRV1 to HDRV2 165 180 195 deg FREQ Pin Voltage vs. VIN 0.105 V/V System Minimum ON Time VFPWM = 3V 30 ns VIN = 5.5V 60 75 % Maxmimum Duty Cycle VIN = 15V 40 50 % VIN = 28V, VDD= 4.5V 22 28 % Gate Drivers HDRV Source Impedance HDRV Pin Current (sourcing)= 7 Ω 1.2A HDRV Sink Impedance HDRV Pin Current (sinking) = 1A 2 Ω (4) If the LM2647 starts up with a pre-charged soft start capacitor, it will first discharge the capacitor to VSS_RESET and then begin the normal Soft-start process. Copyright © 2003–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM2647 |
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