Zakładka z wyszukiwarką danych komponentów |
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LM3481 Arkusz danych(PDF) 6 Page - Texas Instruments |
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LM3481 Arkusz danych(HTML) 6 Page - Texas Instruments |
6 / 38 page LM3481, LM3481-Q1 SNVS346F – NOVEMBER 2007 – REVISED NOVEMBER 2014 www.ti.com Electrical Characteristics (continued) VIN= 12 V, RFA= 40 kΩ, TJ = 25°C, unless otherwise indicated. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VFA/SYNC/SD = 3 V (3), V IN = 12 V 9 VFA/SYNC/SD = 3 V (3), V IN = 12 V, 15 –40°C ≤ TJ ≤ 125°C IQ Quiescent Current in Shutdown Mode µA VFA/SYNC/SD = 3 V (3), V IN = 5 V 5 VFA/SYNC/SD = 3 V (3), V IN = 5 V, –40°C 10 ≤ TJ ≤ 125°C 160 VSENSE Current Sense Threshold Voltage mV –40°C ≤ TJ ≤ 125°C 100 190 220 VSC Over Load Current Limit Sense Voltage mV –40°C ≤ TJ ≤ 125°C 157 275 VSL Internal Compensation Ramp Voltage 90 mV VCOMP = 1.4 V 85 Output Over-voltage Protection (with VOVP mV respect to feedback voltage)(4) VCOMP = 1.4 V, –40°C ≤ TJ ≤ 125°C 26 135 VCOMP = 1.4 V 70 Output Over-Voltage Protection VOVP(HYS) mV Hysteresis VCOMP = 1.4 V, –40°C ≤ TJ ≤ 125°C 28 106 VCOMP = 1.4 V 450 Gm Error Amplifier Transconductance µmho VCOMP = 1.4 V, –40°C ≤ TJ ≤ 125°C 216 690 VCOMP = 1.4 V, IEAO = 100 µA 60 (Source/Sink) AVOL Error Amplifier Voltage Gain V/V VCOMP = 1.4 V, IEAO = 100 µA 35 66 (Source/Sink), –40°C ≤ TJ ≤ 125°C Source, VCOMP = 1.4 V, VFB = 1.1 V 640 µA Source, VCOMP = 1.4 V, VFB = 1.1 V, 475 837 –40°C ≤ TJ ≤ 125°C Error Amplifier Output Current (Source/ IEAO Sink) Sink, VCOMP = 1.4 V, VFB = 1.4 V 65 µA Sink, VCOMP = 1.4 V, VFB = 1.4 V, 31 100 –40°C ≤ TJ ≤ 125°C Upper Limit: VFB = 0 V, COMP Pin 2.70 Floating V Upper Limit: VFB = 0 V, COMP Pin 2.45 2.93 Floating, –40°C ≤ TJ ≤ 125°C VEAO Error Amplifier Output Voltage Swing Lower Limit: VFB = 1.4 V 0.60 V Lower Limit: VFB = 1.4 V, –40°C ≤ TJ 0.32 0.90 ≤ 125°C tSS Internal Soft-Start Delay VFB = 1.2 V, COMP Pin Floating 8.7 15 21.3 ms tr Drive Pin Rise Time Cgs = 3000 pf, VDR = 0 V to 3 V 25 ns tf Drive Pin Fall Time Cgs = 3000 pf, VDR = 3 V to 0 V 25 ns Output = High (Shutdown) 1.31 V Output = High (Shutdown), –40°C ≤ 1.40 TJ ≤ 125°C Shutdown signal VSD threshold(5)FA/SYNC/SD pin Output = Low (Enable) 0.68 V Output = Low (Enable), –40°C ≤ TJ ≤ 0.40 125°C (3) For this test, the FA/SYNC/SD Pin is pulled to 3 V using a 40-k Ω resistor. (4) The overvoltage protection is specified with respect to the feedback voltage. This is because the overvoltage protection tracks the feedback voltage. The overvoltage threshold can be calculated by adding the feedback voltage (VFB) to the overvoltage protection specification. (5) The FA/SYNC/SD pin should be pulled to VIN through a resistor to turn the regulator off. The voltage on the FA/SYNC/SD pin must be above the max limit for the Output = High longer than 30 µs to keep the regulator off and must be below the minimum limit for Output = Low to keep the regulator on. 6 Submit Documentation Feedback Copyright © 2007–2014, Texas Instruments Incorporated Product Folder Links: LM3481 LM3481-Q1 |
Podobny numer części - LM3481_15 |
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Podobny opis - LM3481_15 |
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