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LM3485MMX-NOPB Arkusz danych(PDF) 3 Page - Texas Instruments |
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LM3485MMX-NOPB Arkusz danych(HTML) 3 Page - Texas Instruments |
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3 / 23 page  LM3485 www.ti.com SNVS178G – JANUARY 2002 – REVISED FEBRUARY 2013 Electrical Characteristics Specifications in Standard type face are for TJ = 25°C, and in bold type face apply over the full Operating Temperature Range (TJ = −40°C to +125°C). Unless otherwise specified, VIN = 12V, VISNS = VIN − 1V, and VADJ = VIN − 1.1V. Datasheet min/max specification limits are specified by design, test, or statistical analysis. Symbol Parameter Test Conditions Min(1) Typ(2) Max(1) Unit IQ Quiescent Current at ground pin FB = 1.5V 250 400 µA (Not Switching) VFB Feedback Voltage 1.226 1.242 1.258 V (3) 1.217 1.267 VHYST Comparator Hysteresis 10 15 mV 14 20 VCL (4) Current limit comparator trip voltage RADJ = 20kΩ 110 mV RADJ = 160kΩ 880 VCL_OFFSET Current limit comparator offset VFB = 1.5V −20 0 +20 mV ICL_ADJ Current limit ADJ current source VFB = 1.5V 3.0 5.5 7.0 µA TCL Current limit one shot off time VADJ = 11.5V 6 9 14 µs VISNS = 11.0V VFB = 1.0V RPGATE Driver resistance Source 5.5 Ω ISOURCE = 100mA Sink 8.5 ISink = 100mA IPGATE Driver Output current Source 0.44 A VIN = 7V, PGATE = 3.5V Sink 0.32 VIN = 7V, PGATE = 3.5V IFB FB pin Bias Current(5) VFB = 1.0V 300 750 nA TONMIN_NOR Minimum on time in normal VISNS = VADJ+0.1V 100 ns operation Cload on OUT = 1000pF (6) TONMIN_CL Minimum on time in current limit VISNS = VADJ+0.1V 175 ns VFB = 1.0V Cload on OUT = 1000pF (6) %VFB/ΔVIN Feedback Voltage Line Regulation 4.5 ≤ VIN ≤ 35V 0.010 %/V (1) All limits are specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). (2) Typical numbers are at 25°C and represent the most likely norm. (3) The VFB is the trip voltage at the FB pin when PGATE switches from high to low. (4) VCL = ICL_ADJ * RADJ (5) Bias current flows out from the FB pin. (6) A 1000pF capacitor is connected between VIN and PGATE. Copyright © 2002–2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM3485 |
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