Datenblatt-Suchmaschine für elektronische Bauteile |
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LM5181-Q1 Datenblatt(PDF) 3 Page - Texas Instruments |
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LM5181-Q1 Datenblatt(HTML) 3 Page - Texas Instruments |
3 / 33 page EN/UVLO VIN FB GND RSET SS/BIAS TC SW 5 8 7 6 4 1 2 3 3 LM5181-Q1 www.ti.com SNVSBN6 – APRIL 2020 Product Folder Links: LM5181-Q1 Submit Documentation Feedback Copyright © 2020, Texas Instruments Incorporated (1) P = Power, G = Ground, I = Input, O = Output. 6 Pin Configuration and Functions NGU Package 8-Pin WSON With Wettable Flanks Top View Pin Functions PIN I/O(1) DESCRIPTION NO. NAME 1 SW P Switch node that is internally connected to the drain of the N-channel power MOSFET. Connect to the primary-side switching terminal of the flyback transformer. 2 FB I Primary-side feedback pin. Connect a resistor from FB to SW. The ratio of the FB resistor to the resistor at the RSET pin sets the output voltage. 3 VIN P/I Input supply connection. Source for internal bias regulators and input voltage sensing pin. Connect directly to the input supply of the converter with short, low impedance paths. 4 EN/UVLO I Enable input and undervoltage lockout (UVLO) programming pin. If the EN/UVLO voltage is below 1.1 V, the converter is in shutdown mode with all functions disabled. If the EN/UVLO voltage is greater than 1.1 V and below 1.5 V, the converter is in standby mode with the internal regulator operational and no switching. If the EN/UVLO voltage is above 1.5 V, the start-up sequence begins. 5 SS/BIAS I Soft start or bias input. Connect a capacitor from SS/BIAS to GND to adjust the output start-up time and input inrush current. If SS/BIAS is left open, the internal 6-ms soft-start timer is activated. Connect an external supply to SS/BIAS to supply bias to the internal voltage regulator and enable internal soft start. 6 TC I Temperature compensation pin. Tie a resistor from TC to RSET to compensate for the temperature coefficient of the forward voltage drop of the secondary diode, thus improving regulation at the secondary-side output. 7 RSET I Reference resistor tied to GND to set the reference current for FB. Connect a 12.1-k Ω resistor from RSET to GND. 8 GND G Analog and power ground. Ground connection of internal control circuits and power MOSFET. - DAP G Die attach pad. Connect to PCB ground plane. |
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Ähnliche Beschreibung - LM5181-Q1 |
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