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LM3100MH Scheda tecnica(PDF) 8 Page - Texas Instruments |
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LM3100MH Scheda tecnica(HTML) 8 Page - Texas Instruments |
8 / 21 page (VIN ± VOUT) x RON 2 VOUT (VIN - 1) x L x 1.18 x 10 20 x I OUT FSW = EN SS BST SW 6V LDO ON TIMER Ron START COMPLETE START COMPLETE UVLO THERMAL SHUTDOWN Gate Drive UVLO LEVEL SHIFT L C BST LM 3100 AVDD SD DRIVER REGULATION COMPARATOR VDD LOGIC DrvH DrvL OVER-VOLTAGE COMPARATOR 0.92V CURRENT LIMIT COMPARATOR 32 mV 80 1200 1 DRIVER GND 11 4,5 15 8 13 7 16 6 2,3 17,18 VREF VDD 1.26V 0.92V 0.8V 1.26V 260 ns OFF TIMER 0.8V PMOS input FB *optional EN VCC VIN RON Zero - Coil Current Detect Vout VIN C VCC VCC RILIM 200: PGND VIN PGND CIN R ON 8 PA V CC 0.26: CSS C FB* C OUT R FB1 R FB2 LM3100 SNVS421F – JANUARY 2006 – REVISED DECEMBER 2009 www.ti.com Simplified Functional Block Diagram Functional Description The LM3100 Step Down Switching Regulator features all functions needed to implement a cost effective, efficient buck power converter capable of supplying 1.5A to a load. This voltage regulator contains Dual 40V N-Channel buck synchronous switches and is available in a thermally enhanced eTSSOP-20 package. The Constant ON- Time (COT) regulation scheme requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. It will work correctly even with an all ceramic output capacitor network and does not rely on the output capacitor’s ESR for stability. The operating frequency remains constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The valley current limit detection circuit, internally set at 1.9A, inhibits the high-side switch until the inductor current level subsides. Please refer to the functional block diagram with a typical application circuit. The LM3100 can be applied in numerous applications and can operate efficiently from inputs as high as 36V. Protection features include: Thermal shutdown, VCC under-voltage lockout, gate drive under-voltage lockout. Hysteretic Control Circuit Overview The LM3100 buck DC-DC regulator employs a control scheme in which the high-side switch on-time varies inversely with the line voltage (VIN). Control is based on a comparator and the one-shot on-timer, with the output voltage feedback (FB) compared with an internal reference of 0.8V. If the FB level is below the reference the buck switch is turned on for a fixed time determined by the input voltage and a programming resistor (RON). Following the on-time, the switch remains off for a minimum of 260ns. If FB is below the reference at that time the switch turns on again for another on-time period. The switching will continue until regulation is achieved. The regulator will operate in discontinuous conduction mode at light load currents, and continuous conduction mode with heavy load current. In discontinuous conduction mode (DCM), current through the output inductor starts at zero and ramps up to a peak during the on-time, then ramps back to zero before the end of the off-time. The next on-time period starts when the voltage at FB falls below the internal reference. Until then the inductor current remains zero and the load is supplied entirely by the output capacitor. In this mode the operating frequency is lower than in continuous conduction mode, and varies with load current. Conversion efficiency is maintained since the switching losses are reduced with the reduction in load and switching frequency. The discontinuous operating frequency can be calculated approximately as follows: (1) 8 Submit Documentation Feedback Copyright © 2006–2009, Texas Instruments Incorporated Product Folder Links: LM3100 |
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