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

1.3 Electrical Parameters

Table 1-1 Electrical Performance Standard Configuration
ParameterTest ConditionsMINTYPMAXUNIT
INPUT CHARACTERISTICS
Input voltage Range VINOperation182436V
Input voltage turn on VIN(ON)Adjusted by the UVLO/SYNC resistors17V
Input voltage turn off VIN(OFF)16.5V
OUTPUT CHARACTERISTICS
Output Voltage VOUT5V
Maximum Output Current IOUT4A
SYSTEM CHARACTERISTICS
Switching frequency250kHz
Peak efficiencyVIN =18V, IOUT = 1.8A86.5%
Junction Temperature, TJ–40150C
Transformer Specifications (Wurth 750319733)
Primary Inductance21µH
Turns Ratio(3-5):(2-1)1:1
(3-5):(6:10) tie (6+7,9+10)2:1
Saturation Current20% inductance reduction6.2A
Leakage Inductance150300nH