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Overview
| Topology | Flyback Converter |
| Input voltage | 120-375 V |
| Output 1 | 100 V / 0.5 A |
| Output 2 | 200 V / 0.25 A |
Description
The NCP1370 is a primary side constant current controller. It features a built in control algorithm that allows to precisely regulate the output current of a Flyback converter from the primary side. This eliminates the need for an opto-coupler and associated circuitry.The control scheme also support non-isolated topology such as Buck-Boost and SEPIC. The output current regulation is within ±2% over a line range of 85 − 265 V rms.The power control uses a Critical Conduction Mode (CrM) approach with valley switching to optimize efficiency and EMI filtering. The controller selects the appropriate valley for operation which keeps the frequency within a tighter range than would normally be possible with simple CrM operation.This manual covers the specification, testing and construction of the NCP1370 demonstration board. The board demonstrates a 50-W LED driver for TV backlighting. A dimming circuitry is also provided to show the dimming performances of the NCP1370. The board allows building 2 different power converters:-200-V Output Voltage with an Output Current of 250 mA-100-V Output Voltage with an Output Current of 500 mA