High Density EVM Description
3
SNVU592D – July 2018 – Revised April 2020
Copyright © 2018–2020, Texas Instruments Incorporated
LM5180-Q1 Single-Output EVM User's Guide
1
High Density EVM Description
The LM5180-Q1 single-output EVM is designed to use a regulated or non-regulated high-voltage input rail
ranging from 10 V to 65 V to produce a tightly-regulated, isolated output voltage of 5 V at load currents of
1 A (or higher depending on V
IN
). This wide V
IN
range isolated DC/DC solution offers outsized voltage
rating and operating margin to withstand supply rail voltage transients.
The power-train passive components selected for this EVM, including flyback transformer, flyback
rectifying diode, and ceramic input and output capacitors, are available from multiple component vendors.
Transformers with functional or basic grade isolation are available with isolation voltages of 1.5 kV and
greater.
1.1
Typical Applications
•
Automotive HEV/EV powertrain systems
•
Sub-AM band
•
: IGBT and
•
and
•
Building automation HVAC systems
•
Isolated bias power rails
1.2
Features and Electrical Performance
•
Tightly-regulated, isolated output voltage of 5 V with ±1.5% load regulation from 1% to 100% load
•
Wide V
IN
operating range of 10 V to 65 V
•
Rated full load current of 1 A at V
IN
= 24 V
•
Maximum switching frequency of 350 kHz remains below the AM band
•
High efficiency across wide load current range
–
Full load efficiency of 86% and 85.5% at V
IN
= 24 V and 48 V, respectively
–
86% efficiency at half-rated load, V
IN
= 24 V
•
1.3-mA and 1-mA no-load supply current at V
IN
= 24 V and 48 V, respectively
•
Ultra-low conducted and radiated EMI signatures
–
Optimized for
requirements
–
Soft switching avoids diode reverse recovery
–
Input
π
-stage EMI filter with damping from electrolytic capacitor ESR
•
BCM control architecture provides fast line and load transient response
–
Peak current-mode control
–
Quasi-resonant switching for reduced power loss
–
Internal loop compensation
•
Integrated 100-V flyback power MOSFET
–
Provides large margin for input voltage transients
•
Cycle-by-cycle overcurrent protection (OCP)
•
Monotonic prebias output voltage start-up
•
User-adjustable soft-start time using capacitor connected between SS/BIAS and GND
–
Option for external bias using auxiliary winding connected to SS/BIAS
•
Resistor-programmable input voltage UVLO with customizable hysteresis for applications with wide
turnon and turnoff voltage difference
–
Input UVLO set to turn on and off at V
IN
of 9.5 V and 6.5 V, respectively
•
Fully assembled, tested, and proven PCB layout with 50-mm × 35-mm total footprint
