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LM25115MT/NOPB Datasheet(PDF) 5 Page - Texas Instruments |
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LM25115MT/NOPB Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 23 page  LM25115 www.ti.com SNVS418A – NOVEMBER 2005 – REVISED APRIL 2013 ELECTRICAL CHARACTERISTICS (continued) Unless otherwise specified, TJ = –40°C to +125°C, VBIAS = 12V, No Load on LO or HO. Symbol Parameter Conditions Min Typ Max Units SOFT-START SS Source Impedance 43 60 77 k Ω SS Discharge Impedance 100 Ω ERROR AMPLIFIER and FEEDBACK REFERENCE VREF FB Reference Voltage Measured at FB pin 0.737 0.75 0.763 V FB Input Bias Current FB = 2V 0.2 0.5 µA COMP Source Current 300 µA Open Loop Voltage Gain 60 dB GBW Gain Bandwidth Product 4 MHz Vio Input Offset Voltage -7 0 7 mV COMP Offset Threshold for VHO = high RAMP = CS = 2 V VOUT = 0V RAMP Offset Threshold for VHO = high COMP = 1.5V, 1.1 V CS = VOUT = 0V CURRENT SENSE AMPLIFIER Current Sense Amplifier Gain 16 V/V Output DC Offset 1.27 V Amplifier Bandwidth 500 kHz CURRENT LIMIT ILIMIT Amp Transconductance 16 mA / V Overall Transconductance 237 mA / V Positive Current Limit VCL = VCS - VVOUT 37 45 53 mV VOUT = 6V and CO/COMP = 1.5V Positive Current Limit Foldback VCL = VCS - VVOUT 31 38 45 mV VOUT = 0V and CO/COMP = 1.5V VCLneg Negative Current Limit VOUT = 6V -17 mV VCL = VCS - VVOUT to cause LO to shutoff RAMP GENERATOR SYNC Input Impedance 2.5 k Ω SYNC Threshold End of cycle detection threshold 15 µA Free Run Mode Peak Threshold RAMP peak voltage with dc current 2.3 V applied to SYNC. Current Mirror Gain Ratio of RAMP charge current to SYNC 2.7 3.3 A/A input current. Discharge Impedance 100 Ω LOW SIDE GATE DRIVER VOLL LO Low-state Output Voltage ILO = 100mA 0.2 0.5 V VOHL LO High-state Output Voltage ILO = -100mA, VOHL = VCC -VLO 0.4 0.8 V LO Rise Time CLOAD = 1000pF 15 ns LO Fall Time CLOAD = 1000pF 12 ns IOHL Peak LO Source Current VLO = 0V 2 A IOLL Peak LO Sink Current VLO = 12V 2.5 A Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM25115 |
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