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LM3492 Fiches technique(PDF) 4 Page - Texas Instruments |
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LM3492 Fiches technique(HTML) 4 Page - Texas Instruments |
4 / 24 page LM3492, LM3492Q SNVS656C – SEPTEMBER 2010 – REVISED MAY 2013 www.ti.com ELECTRICAL CHARACTERISTICS Specification with standard type are for TA = TJ = +25°C only; limits in boldface type apply over the full Operating Junction Temperature (TJ) range. Minimum and Maximum are ensured through test, design or statistical correlation. Typical values represent the most likely parametric norm at TJ = +25°C, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: VIN = 12V. Symbol Parameter Conditions Min Typ Max Units Start-Up Regulator, VCC VCC VCC pin output voltage CVCC = 0.47 µF, no load 4.7 5.5 6.3 V ICC = 2 mA 4.7 5.5 6.3 V VCC-UVLO VCC pin under-voltage lockout threshold (UVLO) VCC increasing 3.56 3.78 4.00 V VCC-UVLO-HYS VCC pin UVLO hysteresis VCC decreasing 310 mV IIN IIN operating current No switching, VFB = 0V 3.6 5.2 mA IIN-SD IIN operating current, Device shutdown VEN = 0V 30 95 µA IVCC VCC pin current limit (1) VCC = 0V 18 30 mA VCC-VOUT VCC pin output voltage when supplied by VOUT VIN = Open, ICC = 1 mA, VOUT = 18V 3.5 4.1 4.7 V Enable Input VEN EN pin input threshold VEN rising 1.55 1.63 1.71 V VEN-HYS EN pin threshold hysteresis VEN falling 194 mV IEN-SHUT Enable Pull-up Current at shutdown VEN = 0V 2 µA IEN-OPER Enable Pull-up Current during operation VEN = 2V 40 µA Current Regulator VIREF IREF pin voltage VIN = 4.5V to 65V 1.231 1.256 1.281 V VDHC50 VIOUT under DHC at IOUT = 50 mA RIREF = 25 kΩ 0.160 0.225 0.290 V VDHC100 VIOUT under DHC at IOUT = 100 mA RIREF = 12.5 kΩ 0.38 0.48 0.58 V VDHC200 VIOUT under DHC at IOUT = 200 mA RIREF = 6.25 kΩ 0.81 0.99 1.17 V IOUT50 Current Output under DHC at VIOUT = VDHC50 RIREF = 25 kΩ, VIOUT = VDHC50 47.5 50 52.5 mA RIREF = 25 kΩ, VIOUT = VDHC50 46.5 50 53.5 mA IOUT100 Current Output under DHC at VIOUT = VDHC100 RIREF = 12.5 kΩ, VIOUT = VDHC100 97 100 103 mA RIREF = 12.5 kΩ, VIOUT = VDHC100 96 100 104 mA IOUT200 Current Output under DHC at VIOUT = VDHC200 RIREF = 6.25 kΩ, VIOUT = VDHC200 194 200 206 mA RIREF = 6.25 kΩ, VIOUT = VDHC200 192 200 208 mA IOUTOFF Leakage at Maximum Work Voltage VDIM = 0, VIOUT = 65V 5 µA VIOUT50-MIN Minimum Work Voltage, 50 mA RIREF = 25 kΩ, IOUT = 0.98 x IOUT50 0.1 0.15 V VIOUT100-MIN Minimum Work Voltage, 100 mA RIREF = 12.5 kΩ, IOUT = 0.98 x IOUT100 0.2 0.35 V VIOUT200-MIN Minimum Work Voltage, 200 mA RIREF = 6.25 kΩ, IOUT = 0.98 x IOUT200 0.4 0.65 V VDIM-HIGH DIM Voltage HIGH 1.17 V VDIM-LOW DIM Voltage LOW 0.7 V Boost Converter ICDHC-SRC CDHC pin source current VCDHC = 1.6V, VFB = 3V, VIOUT = 0V, 60 µA DIM = High ICDHC-SINK CDHC pin sink current VCDHC = 1.6V, VFB = 3V, VIOUT = 3V, 56 µA DIM = High ICDHC-LEAKAGE CDHC pin leakage current DIM = Low, VCDHC = 2.6V 5 46 nA ICL-MAX Integrated MOSFET peak current limit threshold 3.3 3.9 4.5 A ICL-HALF Half integrated MOSFET peak current limit threshold RILIM = 11 kΩ 2.0 A RDS(on) Integrated MOSFET RDS(on) ISW = 500 mA 0.19 0.43 Ω VFBTH-PWRGD Power-Good FB pin threshold 2.25 V IFB Feedback pin input current VFB = 3V 1 µA ton ON timer pulse width VIN = 12V, VOUT = 65V, RRT = 300 kΩ 1460 ns VIN = 24V, VOUT = 32.5V, RRT = 300 kΩ 800 ns VIN = 12V, VOUT = 65V, RRT = 100 kΩ 550 ns VIN = 24V, VOUT = 32.5V, RRT = 100 kΩ 350 ns ton-min-ILIM ON timer minimum pulse width at current limit 145 ns (1) VCC provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading. 4 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Product Folder Links: LM3492 LM3492Q |
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