SLVT246 April   2026

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Dimensions
  6. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Load Regulation
    3. 2.3 Thermal Images
  7. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Load Transients
    4. 3.4 Start-up Sequence

Description

This reference design is a tiny three channel isolated bias supply based on Flyback topology. Providing the voltage supply for isolated gate drivers is a typically use case. The design integrates three 21V, 2W isolated outputs and one 7V non-isolated auxiliary output. The design uses a planar transformer integrated into the printed circuit board (PCB) to reduce the board height and system cost. The LM5158-Q1 converter supports primary-side regulation (PSR) by using an auxiliary winding on the primary side. The maximum efficiency is 88%.