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LM3481-Q1 Datenblatt(PDF) 5 Page - Texas Instruments |
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LM3481-Q1 Datenblatt(HTML) 5 Page - Texas Instruments |
5 / 38 page LM3481, LM3481-Q1 www.ti.com SNVS346F – NOVEMBER 2007 – REVISED NOVEMBER 2014 6.5 Thermal Information LM3481 THERMAL METRIC(1) VSSOP UNIT 10 PINS RθJA Junction-to-ambient thermal resistance 157.3 RθJC(top) Junction-to-case (top) thermal resistance 51.1 RθJB Junction-to-board thermal resistance 76.9 °C/W ψJT Junction-to-top characterization parameter 5.0 ψJB Junction-to-board characterization parameter 75.6 RθJC(bot) Junction-to-case (bottom) thermal resistance - (1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. 6.6 Electrical Characteristics VIN= 12 V, RFA= 40 kΩ, TJ = 25°C, unless otherwise indicated. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VCOMP = 1.4 V, 2.97 ≤ VIN ≤ 48 V 1.275 VFB Feedback Voltage V VCOMP = 1.4 V, 2.97 ≤ VIN ≤ 48 V, 1.256 1.294 –40°C ≤ TJ ≤ 125°C ΔVLINE Feedback Voltage Line Regulation 2.97 ≤ VIN ≤ 48 V 0.003 %/V ΔVLOAD Output Voltage Load Regulation IEAO Source/Sink ±0.5 %/A VUVLO Ramping Down 1.430 Undervoltage Lockout Reference VUVLOSEN V VUVLO Ramping Down, –40°C ≤ TJ ≤ Voltage 1.345 1.517 125°C Enabled 5 IUVLO UVLO Source Current µA Enabled, –40°C ≤ TJ ≤ 125°C 3 6 VUVLOSD UVLO Shutdown Voltage 0.55 0.7 0.82 V ICOMP COMP pin Current Sink VFB = 0V 640 µA VCOMP VFB = 1.275V 1 V RFA = 40 kΩ 475 fnom Nominal Switching Frequency kHz RFA = 40 kΩ, –40°C ≤ TJ ≤ 125°C 406 550 Threshold for Synchronization on Vsync-HI Synchronization Voltage Rising 1.4 V FA/SYNC/SD pin Threshold for Synchronization on Vsync-LOW Synchronization Voltage Falling 0.7 V FA/SYNC/SD pin RDS1 (ON) Driver Switch On Resistance (top) IDR = 0.2A, VIN= 5 V 4 Ω RDS2 (ON) Driver Switch On Resistance (bottom) IDR = 0.2A 2 Ω VIN < 6V VIN VDR (max) Maximum Drive Voltage Swing(1) V VIN ≥ 6V 6 Dmax Maximum Duty Cycle RFA=40 kΩ 81% 85% 250 363 ns tmin (on) Minimum On Time worst case over temperature 571 ns See(2) 3.7 ISUPPLY Supply Current (switching) mA See(2), –40°C ≤ TJ ≤ 125°C 5.0 (1) The drive pin voltage, VDR, is equal to the input voltage when input voltage is less than 6 V. VDR is equal to 6 V when the input voltage is greater than or equal to 6 V. (2) For this test, the FA/SYNC/SD Pin is pulled to ground using a 40-k Ω resistor. Copyright © 2007–2014, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM3481 LM3481-Q1 |
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