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LM20242 Scheda tecnica(PDF) 4 Page - Texas Instruments |
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LM20242 Scheda tecnica(HTML) 4 Page - Texas Instruments |
4 / 28 page LM20242 SNVS534D – OCTOBER 2007 – REVISED MAY 2008 www.ti.com 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 specified 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 Oscillator FSW1 Switching Frequency 1 RRT = 49.9 kΩ 675 750 825 kHz FSW2 Switching Frequency 2 RRT = 249 kΩ 225 250 325 kHz DMAX Maximum Duty Cycle ILOAD = 0A 90 % VRT RT pin voltage RRT = 250 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 = 1V 200 350 µA VCOMP = 0.5V gm Error Amplifier DC Transconductance ICOMP = -50 µA to +50 µA 400 515 600 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 Current Limit 3.1 3.7 4.65 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 0 LFM airflow 30 °C/W 4 Submit Documentation Feedback Copyright © 2007–2008, Texas Instruments Incorporated Product Folder Links: LM20242 |
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