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SNVU609B – October 2018 – Revised April 2020
Copyright © 2018–2020, Texas Instruments Incorporated
LM5180-Q1 Dual-Output EVM User's Guide
User's Guide
SNVU609B – October 2018 – Revised April 2020
LM5180-Q1 Dual-Output EVM User's Guide
With input voltage range and current capability as specified in
, the family of PSR flyback DC/DC
converters from TI provides flexibility, scalability, and optimized solution size for a range of applications.
Using an 8-pin WSON package with 4-mm × 4-mm footprint and 0.8-mm pin pitch, these converters
enable isolated DC/DC solutions with high density and low component count.
Table 1. PSR Flyback DC/DC Converter Family
PSR FLYBACK
CONVERTER
INPUT VOLTAGE
RANGE
PEAK SWITCH
CURRENT (TYP)
MAXIMUM LOAD CURRENT, V
OUT
= 12 V, N
PS
= 1
V
IN
= 4.5 V
V
IN
= 13.5 V
V
IN
= 24 V
4.5 V to 65 V
0.75 A
90 mA
180 mA
225 mA
4.5 V to 65 V
1.5 A
180 mA
360 mA
450 mA
4.5 V to 42 V
1.5 A
180 mA
360 mA
450 mA
4.5 V to 42 V
2.5 A
300 mA
600 mA
750 mA
4.5 V to 42 V
4.1 A
500 mA
1 A
1.25 A
The
evaluation module (EVM) is a flyback DC/DC converter that employs primary-side
regulation (PSR) based on sampling of the primary winding voltage of the transformer to achieve high
conversion efficiency in a small footprint. It operates over a wide input voltage range of 10 V to 65 V and
delivers dual isolated outputs of 15 V and –7.7 V at 200-mA rated load current. Operating without an
optocoupler or transformer auxiliary winding, the converter provides an output voltage with better than
±2% load regulation. The flyback transformer has a turns ratio of 1 : 1: 0.52 (PRI : SEC1 : SEC2) and
provides 1500 VRMS primary-to-secondary isolation.
The EVM design uses the
PSR flyback converter with wide input voltage (wide V
IN
) range. An
integrated 100-V, 1.5-A power MOSFET provides ample margin for line transients and switch (SW) node
voltage spikes related to transformer parasitic leakage inductance. Load regulation errors related to
transformer secondary winding resistance are avoided by virtue of the quasi-resonant boundary
conduction mode (BCM) control scheme.
Additional features includes current-mode control with internal compensation, hiccup-mode fault
protection, low input quiescent current, programmable soft-start, and optional output voltage temperature
compensation. UVLO protects the converter at low input voltage conditions, and the EN/UVLO pin
supports adjustable input UVLO with user-defined hysteresis for application specific power-up and power-
down requirements.
The LM5180 and LM5180-Q1 are available in a 8-pin WSON package with 4-mm × 4-mm footprint and
0.8-mm pin pitch to enable isolated DC/DC solutions with high density and low component count. Wettable
flank pins provide a visual indicator of solderability, which reduces the inspection time and manufacturing
costs in high-reliability industrial and automotive applications. See the
and
device
data sheets for more information.
Use the LM5180-Q1 with
to create a custom regulator design. Furthermore,
the user can download the
to optimize component selection and examine
predicted efficiency performance across line and load ranges.
