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LM5181-Q1 Datenblatt(PDF) 3 Page - Texas Instruments

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Teilenummer LM5181-Q1
Bauteilbeschribung  LM5181-Q1 65-VIN PSR Flyback DC/DC Converter with 100-V, 0.75-A Integrated MOSFET
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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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