TIDT277
April 2022
Description
Features
Applications
1
Test Prerequisites
1.1
Voltage and Current Requirements
1.2
Considerations
1.3
Dimensions
2
Testing and Results
2.1
Efficiency Graphs, all Outputs Similar Loaded
2.2
Load Regulation
2.3
Cross Regulation and Further Data For Non-Symmetrical Loading
2.4
Line Regulation at Full Load to all Outputs
2.5
Thermal Images
3
Waveforms
3.1
Switching
3.1.1
Switchnode to GND
3.1.2
Diode D3
3.2
Output Voltage Ripple
3.3
Input Voltage Ripple
3.3.1
Power Stage Input
3.3.2
Between L1 and L2
3.3.3
Input Terminal
3.4
Start-Up Sequence
3.5
Shutdown Sequence
Features
Two-stage differential input filter to prevent from conducted emissions
Three outputs (+17 V and –4 V ) with efficiency 86% at full load, temperature rise only +15 K at full load
Simple transformer windings by using virtual output return provides isolation voltage 2500 V
RMS
No optoisolator design, primary-side regulation
Two-layer board, single-side assembly, high-power density by using integrated FET, circuit geometry 70 mm × 35 mm
Maximum height 7.4 mm (by low profile transformer)