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LM20343 Fiches technique(PDF) 5 Page - Texas Instruments |
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LM20343 Fiches technique(HTML) 5 Page - Texas Instruments |
5 / 30 page LM20343 www.ti.com SNVS559A – MAY 2008 – REVISED AUGUST 2008 Electrical Characteristics (continued) Unless otherwise stated, the following conditions apply: VVIN = 12V. Limits in standard type are for TJ = 25°C only, limits in bold face type apply over the junction temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits are guaranteed 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. Symbol Parameter Conditions Min Typ Max Units DMAX Maximum Duty Cycle ILOAD = 3A 80 % VRT RT pin voltage RRT = 249 kΩ 550 mV Error Amplifier IFB Feedback Pin Bias Current VFB = 1V 50 nA ICOMP(SRC) COMP Output Source Current VFB = 0V 200 400 µA VCOMP = 0V ICOMP(SNK) COMP Output Sink Current VFB = 1.6V 200 350 µA VCOMP = 1.6V gm Error Amplifier DC Transconductance ICOMP = -50 µA to +50 µA 450 515 600 µmho AVOL Error Amplifier Voltage Gain COMP pin open 2000 V/V GBW Error Amplifier Gain-Bandwidth Product COMP pin open 7 MHz Current Limit ILIM Cycle By Cycle Positive Current Limit 4.3 5.2 6.0 A ILIMNEG Cycle By Cycle Negative Current Limit 2.8 A TILIM Cycle By Cycle Current Limit Delay 150 ns Enable VEN(RISING) EN Pin Rising Threshold 1.2 1.25 1.3 V VEN(HYS) EN Pin Hysteresis 50 mV IEN EN Source Current VEN = 0V, VVIN = 12V 2 µA Thermal Shutdown TSD Thermal Shutdown 170 °C TSD(HYS) Thermal Shutdown Hysteresis 20 °C Thermal Resistance θJC Junction to Case 5.6 °C/W θJA Junction to Ambient(1) 0 LFM airflow 27 °C/W (1) Measured on a 4 layer 2" x 2" PCB with 1 oz. copper weight inner layers and 2 oz. outer layers. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM20343 |
Numéro de pièce similaire - LM20343_14 |
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Description similaire - LM20343_14 |
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