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LM3478Q-Q1 Arkusz danych(PDF) 5 Page - Texas Instruments |
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LM3478Q-Q1 Arkusz danych(HTML) 5 Page - Texas Instruments |
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5 / 38 page  LM3478, LM3478Q-Q1 www.ti.com SNVS085W – JULY 2000 – REVISED DECEMBER 2014 6.5 Thermal Information LM3478 LM3478-Q1 THERMAL METRIC(1) D DCK DCK UNIT 3 PINS 3 PINS 3 PINS RθJA Junction-to-ambient thermal resistance 157.2 157.2 157.2 RθJC(top) Junction-to-case (top) thermal resistance 49.9 49.9 49.9 RθJB Junction-to-board thermal resistance 77.1 77.1 77.1 °C/W ψJT Junction-to-top characterization parameter 4.7 4.7 4.7 ψJB Junction-to-board characterization parameter 75.8 75.8 75.8 RθJC(bot) Junction-to-case (bottom) thermal resistance N/A N/A N/A (1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. 6.6 Electrical Characteristics Unless otherwise specified, VIN = 12V, RFA = 40kΩ, TJ = 25°C PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VCOMP = 1.4V, 2.97 ≤ VIN ≤ 40V 1.2416 1.26 1.2843 VFB Feedback Voltage V VCOMP = 1.4V, 2.97 ≤ VIN ≤ 40V, −40°C 1.228 1.292 ≤ TJ ≤ 125°C ΔVLINE Feedback Voltage Line 2.97 ≤ VIN ≤ 40V 0.001 %/V Regulation ΔVLOAD Output Voltage Load IEAO Source/Sink ±0.5 %/A Regulation 2.85 Input Undervoltage VUVLO V Lock-out −40°C ≤ TJ ≤ 125°C 2.97 VUV(HYS) Input Undervoltage 170 mV Lock-out Hysteresis −40°C ≤ TJ ≤ 125°C 130 210 RFA = 40KΩ 400 Nominal Switching Fnom kHz Frequency RFA = 40KΩ, −40°C ≤ TJ ≤ 125°C 350 440 Driver Switch On RDS1 (ON) IDR = 0.2A, VIN= 5V 16 Resistance (top) Ω Driver Switch On RDS2 (ON) IDR = 0.2A 4.5 Resistance (bottom) VIN < 7.2V VIN Maximum Drive Voltage VDR (max) V Swing(1) VIN ≥ 7.2V 7.2 Dmax Maximum Duty Cycle(2) 100% 325 Tmin (on) Minimum On Time ns −40°C ≤ TJ ≤ 125°C 210 600 See (3) 2.7 Supply Current (non- ISUPPLY mA switching) See (3), −40°C ≤ TJ ≤ 125°C 3.3 VFA/SD = 5V (4), V IN = 5V 5 Quiescent Current in IQ µA VFA/SD = 5V (4), V IN = 5V, −40°C ≤ TJ ≤ Shutdown Mode 10 125°C VIN = 5V 135 156 180 Current Sense VSENSE mV Threshold Voltage VIN = 5V, −40°C ≤ TJ ≤ 125°C 125 190 VIN = 5V 343 Short-Circuit Current VSC mV Limit Sense Voltage VIN = 5V, −40°C ≤ TJ ≤ 125°C 250 415 (1) The voltage on the drive pin, VDR is equal to the input voltage when input voltage is less than 7.2 V. VDR is equal to 7.2 V when the input voltage is greater than or equal to 7.2 V. (2) The limits for the maximum duty cycle can not be specified since the part does not permit less than 100% maximum duty cycle operation. (3) For this test, the FA/SD pin is pulled to ground using a 40-K resistor. (4) For this test, the FA/SD pin is pulled to 5 V using a 40-K resistor. Copyright © 2000–2014, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM3478 LM3478Q-Q1 |
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