SLVT248 May   2026  – May 2026

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Functional Block Diagram
    3. 1.3 Pin Functions
    4. 1.4 Required Equipment
    5. 1.5 Dimensions
    6. 1.6 Test Setup
  7. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Voltage Regulation
    4. 2.4 Thermal Images
  8. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Short-Circuit Protection
    4. 3.4 Load Transients
    5. 3.5 Start-Up and Shutdown Sequence
    6. 3.6 Brown In and Brown Out
  9.   Trademarks

2.4 Thermal Images

The thermal test was performed at room temperature, open frame, with a 30 minute warmup.

Table 2-2 Thermal Test Data at Full Load Condition
Temperature 127 VDC 400 VDC
UCG28826 49.3 71.7
Transformer 42.0 48.3
SR MOSFET 45.3 49.8
SR controller 45.1 49.8
+18V PVCC rectifier diode 69.0 79.4

Thermal images are shown in Figure 2-4 and Figure 2-5.


PMP41184 127VDC, Full Load Figure

Figure 2-4 127VDC, Full Load Figure

PMP41184 400VDC, Full Load

Figure 2-5 400VDC, Full Load