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LM3445MM Datasheet(PDF) 5 Page - Texas Instruments |
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LM3445MM Datasheet(HTML) 5 Page - Texas Instruments |
5 / 42 page LM3445 www.ti.com SNVS570M – JANUARY 2009 – REVISED NOVEMBER 2015 6.5 Electrical Characteristics All Typical limits are for TJ = 25°C and all Maximum and Minimum limits apply over the full Operating Temperature Range ( TJ = −40°C to +125°C). Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = +25ºC, and are provided for reference purposes only. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT BLEEDER RBLDR Bleeder resistance to GND IBLDR = 10 mA 230 325 Ω VCC SUPPLY IVCC Operating supply current 2 2.85 mA Rising threshold 7.4 7.7 VCC-UVLO Falling threshold 6 6.4 V Hysterisis 1 COFF VCOFF Time out threshold 1.225 1.276 1.327 V RCOFF Off timer sinking impedance 33 60 Ω tCOFF Restart timer 180 µs CURRENT LIMIT VISNS ISNS limit threshold 1.174 1.269 1.364 V Leading edge blanking time 125 ns Current limit reset delay 180 µs tISNS ISNS = 0 to 1.75-V ISNS limit to GATE delay 33 ns step INTERNAL PWM RAMP fRAMP Frequency 5.85 kHz Valley voltage 0.96 1 1.04 VRAMP V Peak voltage 2.85 3 3.08 DRAMP Maximum duty cycle 96.5% 98% DIM DECODER tANG_DET Angle detect rising threshold Observed on BLDR pin 6.79 7.21 7.81 V ASNS filter delay 4 µs VASNS ASNS VMAX 3.85 4 4.15 V ASNS drive capability sink VASNS = 2 V 7.6 ASNS drive capability source VASNS = 2 V –4.3 IASNS mA DIM low sink current VDIM = 1 V 1.65 2.8 DIM High source current VDIM = 4 V –4 –3 PWM input voltage DIM low voltage 0.9 1.33 threshold VDIM V DIM high voltage 2.33 3.15 VTSTH Tri-state threshold voltage Apply to FLTR1 pin 4.87 5.25 V RDIM DIM comparator tri-state impedance 10 M Ω CURRENT SENSE COMPARATOR VFLTR2 FLTR2 open circuit voltage 720 750 780 mV RFLTR2 FLTR2 impedance 420 k Ω VOS Current sense comparator offset voltage –4 0.1 4 mV GATE DRIVE OUTPUT VDRVH GATE high saturation IGATE = 50 mA 0.24 0.5 V VDRVL GATE low saturation IGATE = 100 mA 0.22 0.5 Peak souce current GATE = VCC/2 –0.77 IDRV A Peak sink current GATE = VCC/2 0.88 Copyright © 2009–2015, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM3445 |
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