DC/DC Converter. LM5181 Datasheet

LM5181 Converter. Datasheet pdf. Equivalent

Part LM5181
Description PSR Flyback DC/DC Converter
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LM5181
SNVSBM6 – APRIL 2020
LM5181 65-VIN PSR Flyback DC/DC Converter with 100-V, 0.75-A Integrated MOSFET
1 Features
2 Applications
1 Designed for reliable and rugged applications
– Wide input voltage range of 4.5 V to 65 V with
operation down to 3.5 V after start-up
– Robust solution with only one component
crossing the isolation barrier
– ±1.5% total output regulation accuracy
– Optional VOUT temperature compensation
– 6-ms internal or programmable soft start
– Input UVLO and thermal shutdown protection
– Hiccup-mode overcurrent fault protection
– –40°C to +150°C junction temperature range
• Integration reduces solution size and cost
– Integrated 100-V, 0.4-Ω power MOSFET
– No opto-coupler or transformer auxiliary
winding required for VOUT regulation
– Internal loop compensation
• High-efficiency PSR flyback operation
– Quasi-resonant MOSFET turn-off in BCM
– Low input quiescent current
– External bias option for improved efficiency
– Single- and multi-output implementations
• Ultra-low conducted and radiated EMI signatures
– Soft switching avoids diode reverse recovery
– Optimized for CISPR 32 EMI requirements
• Create a custom regulator design using
WEBENCH® Power Designer
Isolated field transmitters and field actuators
• Multi-output rails for analog input modules
Motor drives: IGBT and SiC gate drive supplies
Building automation HVAC systems
• Isolated bias supplies
3 Description
The LM5181 is a primary-side regulated (PSR)
flyback converter with high efficiency over a wide
input voltage range of 4.5 V to 65 V. The isolated
output voltage is sampled from the primary-side
flyback voltage, eliminating the need for an
optocoupler, voltage reference, or third winding from
the transformer for output voltage regulation.
The high level of integration results in a simple,
reliable and high-density design with only one
component crossing the isolation barrier. Boundary
conduction mode (BCM) switching enables a compact
magnetic solution and better than ±1.5% load and
line regulation performance. An integrated 100-V
power MOSFET provides output power up to 4 W
with enhanced headroom for line transients.
The LM5181 flyback converter is available in a 8-pin,
4-mm × 4-mm, thermally-enhanced WSON package
with 0.8-mm pin pitch.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM5181
WSON (8)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VIN = 4.5 V...65 V
Typical Application
T1 DFLY VOUT = 5 V
CIN
2.2 F
DZ
VIN
EN/UVLO SW
LM5181
GND
FB
DF 3 : 1
RFB
158 k:
RSET
SS/BIAS
TC
RSET
12.1 k:
COUT
100 F
Typical Efficiency, VOUT = 5 V
90
85
80
75
70
VIN = 12V
VIN = 24V
65 VIN = 36V
VIN = 48V
VIN = 65V
60
0 100 200 300 400 500 600 700
Output Current (mA)
D002
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.



LM5181
LM5181
SNVSBM6 – APRIL 2020
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Description (continued)......................................... 2
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 4
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Information .................................................. 4
7.5 Electrical Characteristics........................................... 5
7.6 Typical Characteristics .............................................. 6
8 Detailed Description .............................................. 9
8.1 Overview ................................................................... 9
8.2 Functional Block Diagram ......................................... 9
8.3 Feature Description................................................... 9
8.4 Device Functional Modes........................................ 15
9 Application and Implementation ........................ 16
9.1 Application Information............................................ 16
9.2 Typical Applications ................................................ 16
10 Power Supply Recommendations ..................... 22
11 Layout................................................................... 23
11.1 Layout Guidelines ................................................. 23
11.2 Layout Examples................................................... 24
12 Device and Documentation Support ................. 25
12.1 Device Support...................................................... 25
12.2 Documentation Support ....................................... 26
12.3 Receiving Notification of Documentation Updates 26
12.4 Support Resources ............................................... 26
12.5 Trademarks ........................................................... 26
12.6 Electrostatic Discharge Caution ............................ 27
12.7 Glossary ................................................................ 27
13 Mechanical, Packaging, and Orderable
Information ........................................................... 27
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
DATE
REVISION
NOTES
April 2020
*
Initial release
5 Description (continued)
The LM5181 flyback converter simplifies implementation of isolated DC/DC supplies with optional features to
optimize performance for the target end equipment. The output voltage is set by one resistor, while an optional
resistor improves output voltage accuracy by negating the thermal coefficient of the flyback diode voltage drop.
Additional features include an internally-fixed or externally-programmable soft start, optional bias supply
connection for higher efficiency, precision enable input with hysteresis for adjustable line UVLO, hiccup-mode
overload protection, and thermal shutdown protection with automatic recovery.
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Product Folder Links: LM5181
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