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NCP1339EDR2G Datasheet(PDF) 3 Page - ON Semiconductor |
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NCP1339EDR2G Datasheet(HTML) 3 Page - ON Semiconductor |
3 / 31 page NCP1339 www.onsemi.com 3 PIN FUNCTION DESCRIPTION Pin Number Pin Name Function 1 X2 When the voltage on this pin disappears, the controller ensures the X2−capacitors discharge. 2 REM The part operates when the REM pin is forced lower than a certain level and enters the Power Savings Mode (PSM) otherwise. 3 OPP A resistive divider from the auxiliary winding to this pin sets the OPP compensation level. 4 ZCD Input to the demagnetization detection comparator for the QR Flyback controller. 5 Fault The controller enters fault mode if the voltage of this pin is pulled above or below the fault thresholds. A pre- cise pull up current source allows direct interface with an NTC thermistor. Fault detection triggers a latch. 6 FB Feedback input for the QR Flyback controller. Allows direct connection to an optocoupler. 7 CS Input to the cycle−by−cycle current limit comparator for the QR Flyback section. 8 GND Ground reference. 9 DRV This is the drive pin of the circuit. The DRV high−current capability (−0.5 /+0.8 A) makes it suitable to effec- tively drive high gate charge power MOSFETs. 10 VCC This pin is the positive supply of the IC. The circuit starts to operate when VCC exceeds 15 V and turns off when VCC goes below 9 V (typical values). After start−up, the operating range is 10 V up to 28 V. An OVP comparator monitors this pin and offers a means to latch the converter in fault conditions. 11 NC 12 NC 13 Removed for creepage distance. 14 HV This pin provides a charging current during start−up and auto−recovery faults but also a means to efficiently discharge the input X2 capacitors. |
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