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LM51551DSSR Datasheet(PDF) 11 Page - Texas Instruments |
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LM51551DSSR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 49 page BIAS VCC FB PGOOD VLOAD VSUPPLY + ± + ± VOVTH VUVTH VCC Regulator BIAS VCC_EN VCC UVLO VCC_OK FB CIN COUT LM RLOAD Q1 D1 RS ISLOPE GATE CS VCS1 VCS2 S Q Q R Clock Generator AGND PGND Clock_Sync + ± + ± VCS1 VCSTH VCS2 PWM Comparator C/L Comparator + ± RCOMP CCOMP RT COMP FB SS + VREF ISS Optional Hiccup Mode IUVLO UVLO/ SYNC + ± + ± VEN VCC_EN SYNC Detector Clock_Sync TSD VCC_OK RUN VSUPPLY VUVLO CSS RUVLOT RUVLOB RFBT RFBB CVCC OVP GCOMP RT OVP TSD 11 LM5155 www.ti.com SNVSB75 – DECEMBER 2018 Product Folder Links: LM5155 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated 9 Detailed Description 9.1 Overview The LM5155 device is a wide input range, non-synchronous boost controller that uses peak-current-mode control. The device can be used in boost, SEPIC, and flyback topologies. The LM5155 device can start up from a 1-cell battery with a minimum of 2.97 V if the BIAS pin is connected to the VCC pin. It can operate with the input supply voltage as low as 1.5 V if the BIAS pin is greater than 3.5 V.The internal VCC regulator also supports BIAS pin operation up to 45 V (50-V absolute maximum) . The switching frequency is dynamically programmable with an external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHz minimizes AM band interference and allows for a small solution size and fast transient response. The device features a 1.5-A standard MOSFET driver and a low 100-mV current limit threshold. The device also supports the use of an external VCC supply to improve efficiency. Low operating current and pulse skipping operation improve efficiency at light loads. The device has built-in protection features such as cycle-by-cycle current limit, overvoltage protection, line UVLO and thermal shutdown. Hiccup mode overload protection is available in the LM51551 device option. Additional features include low shutdown IQ, programmable soft start, programmable slope compensation, precision reference, power good indicator, and external clock synchronization. 9.2 Functional Block Diagram |
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