SNVU736 September   2020 LM51561H , LM51561H-Q1 , LM5156H , LM5156H-Q1

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Features
    2. 1.2 Applications Schematic
    3. 1.3 Electrical Parameters
  3. 2EVM Setup
    1. 2.1 EVM Connectors and Test Points
  4. 3Testing Procedures
    1. 3.1 Testing Equipment
    2. 3.2 Precautions
  5. 4Test Results
    1. 4.1 Efficiency Curve
    2. 4.2 Load Regulation
    3. 4.3 Thermal Performance
    4. 4.4 Steady State Waveforms
    5. 4.5 Start-up Waveforms
    6. 4.6 Load Transient Waveforms
    7. 4.7 Load Short-Circuit
    8. 4.8 AC Loop Response
  6. 5PCB Layout
  7. 6Schematics
  8. 7Bill of Materials

2.1 EVM Connectors and Test Points

Table 2-1 indicates the avaliable test points and configuration jumpers.

Table 2-1 Test Point Description
JumperNameDescription
TP1VINPositive input voltage sense connection
TP2VOUT+Positive output voltage sense connection
TP3PGNDNegative input voltage sense connection
TP4ISO_GNDNegative isolated output voltage sense connection
TP5SWProbe point for the switch node of the LM5155 flyback circuit
TP6VOUT+Loop response positive injection point
TP7VOUT-Loop response negative injection point
TP8AGNDAnalog ground connection point
TP9ISO_GNDIsolated ground connection point
J1-Input power connections
J2-Output power connections
J3PGNDPower ground connection point
J4PGOOD (pin 1)Probe voltage on the PGOOD pin of the LM5155
COMP (pin 2)Probe voltage on the COMP pin of the LM5155
SS (pin 3)Probe voltage on the SS pin of the LM5155
VAUX (pin 4)Auxiliary winding voltage
PGND (pin 5)Power ground connection

J5

DITHOFF

Placing jumper between pin 1 and pin 2 disables frequncy dithering. Placing a jumper between pin 2 and pin 3 enabled frequency dithering