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NCP1217D100R2G Datasheet(PDF) 2 Page - ON Semiconductor |
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NCP1217D100R2G Datasheet(HTML) 2 Page - ON Semiconductor |
2 / 19 page NCP1217, NCP1217A http://onsemi.com 2 Figure 1. Typical Application Example EMI FILTER UNIVERSAL INPUT + + NCP1217 + VOUT Aux. Adj FB CS Gnd HV VCC Drv 1 2 3 4 8 7 6 5 Ramp Adjustment See Application Section PIN FUNCTION DESCRIPTION Pin No. Pin Name Function Description 1 Adj Adjust the skipping peak current This pin lets you adjust the level at which the cycle skipping process takes place. Shorting this pin to ground permanently disables the skip cycle feature. By bringing this pin above 3.1 V, you permanently shut off the device. 2 FB Sets the peak current setpoint By connecting an optocoupler to this pin, the peak current setpoint is ad- justed accordingly to the output power demand. 3 CS Current sense input This pin senses the primary current and routes it to the internal comparat- or via an L.E.B. By inserting a resistor in series with the pin, you control the amount of ramp compensation you need. 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 22 mF. 7 NC -- This unconnected pin ensures adequate creepage distance. 8 HV Ensures a clean and lossless startup sequence Connected to the high--voltage rail, this pin injects a constant current into the VCC capacitor during the startup sequence. |
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