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NCP1378P Datasheet(PDF) 2 Page - ON Semiconductor |
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NCP1378P Datasheet(HTML) 2 Page - ON Semiconductor |
2 / 16 page NCP1378 http://onsemi.com 2 Figure 1. Typical Application Schematic 1 8 2 3 4 6 5 7 NCP1378 OVP and Demag + Universal Network R* + 12 V @ 1 A GND + Y1 Type *Please refer to the application information section. PIN FUNCTION DESCRIPTION Pin Symbol Function Description 1 Demag Core reset detection and OVP The auxiliary FLYBACK signal ensures discontinuous operation and offers a fixed overvoltage detection level of 5.2 V. 2 FB Sets the peak current setpoint By connecting an optocoupler to this pin, the peak current setpoint is adjusted accordingly to the output power demand. By bringing this pin below the internal skip level, you shut off the device. 3 CS Current sense input and skip cycle level selection This pin senses the primary current and routes it to the internal comparator via an L.E.B. By inserting a resistor in series with the pin, you control the level at which the skip operation takes place. 4 GND The IC ground − 5 Drv Driving pulses The driver’s output to an external MOSFET. 6 VCC Supplies the IC This pin is connected to an external bulk capacitor of typically 47 mF. 7 NC − This unconnected pin ensures adequate creepage distance. 8 HV High−voltage pin Connected to the high−voltage rail, this pin injects a constant current into the VCC bulk capacitor and ensures a clean lossless startup sequence. |
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