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NCP1239BD100R2G Datasheet(PDF) 2 Page - ON Semiconductor |
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NCP1239BD100R2G Datasheet(HTML) 2 Page - ON Semiconductor |
2 / 26 page NCP1239 www.onsemi.com 2 Figure 1. Application Schematic (OPP Adjustment) NCP1239 Vbulk . . OPP adjsut. Vout OVP 1 2 6 45 8 3 NTC Table 1. PIN FUNCTION DESCRIPTION Pin No. Pin Name Description 1 Fault The controller enters fault mode if the voltage of this pin is pulled above or below the fault thresholds. A precise pull up current source allows direct interface with an NTC thermistor. Fault detection triggers a latch. 2 FB Hooking an optocoupler collector to this pin will allow regulation. 3 CS This pin monitors the primary peak current but also offers an overpower compensation adjustment. When the CS pin is brought above 1.2 V, the part is permanently latched off. 4 GND The controller ground. 5 DRV The driver’s output to an external MOSFET gate. 6 VCC This pin is connected to an external auxiliary voltage. An OVP comparator monitors this pin and offers a means to latch the converter in fault conditions. 7 NC Non-connected for improved creepage distance. 8 HV Connected to the bulk capacitor or rectified ac line, this pin powers the internal current source to deliver a start- up current. It is also used to provide the brown-out detection and the HV sensing for the Overpower protection. |
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