CHB75 49.5-75W Isolated DC-DC Converter
Application Note V10 April 2017
2
Contents
1. Introduction ............................................................................................................................ 3
2. DC-DC Converter Features.................................................................................................... 3
3. Electrical Block Diagram ........................................................................................................ 3
4. Technical Specifications......................................................................................................... 4
5. Main Features and Functions................................................................................................. 7
5.1 Operating Temperature Range......................................................................................................7
5.2 Output Voltage Adjustment............................................................................................................7
5.3 Over Current Protection.................................................................................................................7
5.4 Output Over Voltage Protection.....................................................................................................7
5.6 Remote On/Off ..............................................................................................................................7
5.7 UVLO (Under Voltage Lock Out) ...................................................................................................7
5.8 Over Temperature Protection ........................................................................................................7
6. Applications............................................................................................................................ 7
6.1 Recommended Layout, PCB Footprint and Soldering Information .................................................7
6.2 Convection Requirements for Cooling ...........................................................................................8
6.3 Thermal Considerations ................................................................................................................8
6.4 Input Capacitance at the Power Module ........................................................................................8
6.5 Power Derating..............................................................................................................................9
6.6 Half Brick Heat Sinks:..................................................................................................................11
6.7 Efficiency VS. Load .....................................................................................................................12
6.8 Test Set-Up .................................................................................................................................15
6.9 Output Voltage Adjustment..........................................................................................................15
6.10 Output Remote Sensing ............................................................................................................16
6.11 Output Ripple and Noise............................................................................................................16
6.12 Output Capacitance...................................................................................................................16
7. Safety & EMC....................................................................................................................... 17
7.1 Input Fusing and Safety Considerations ......................................................................................17
7.2 EMC Considerations....................................................................................................................17
8. Part Number......................................................................................................................... 22
9. Mechanical Specifications.................................................................................................... 22
9.1 Mechanical Outline Diagrams......................................................................................................22