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NCP1239 Dataheets PDF



Part Number NCP1239
Manufacturers ON Semiconductor
Logo ON Semiconductor
Description Fixed Frequency Current-Mode Controller
Datasheet NCP1239 DatasheetNCP1239 Datasheet (PDF)

DATA SHEET www.onsemi.com Fixed Frequency Current‐Mode Controller for Flyback Converter NCP1239 The NCP1239 is a fixed-frequency current-mode controller featuring a high-voltage start-up current source to provide a quick and lossless power-on sequence. This function greatly simplifies the design of the auxiliary supply and the VCC capacitor by activating the internal start-up current source to supply the controller during start-up, transients, latch, stand-by etc. With a supply range up to 35 V.

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DATA SHEET www.onsemi.com Fixed Frequency Current‐Mode Controller for Flyback Converter NCP1239 The NCP1239 is a fixed-frequency current-mode controller featuring a high-voltage start-up current source to provide a quick and lossless power-on sequence. This function greatly simplifies the design of the auxiliary supply and the VCC capacitor by activating the internal start-up current source to supply the controller during start-up, transients, latch, stand-by etc. With a supply range up to 35 V, the controller hosts a jittered 65 or 100-kHz switching circuitry operated in peak current mode control. When the power on the secondary side starts to decrease, the controller automatically folds back its switching frequency down to minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while limiting the peak current that insures excellent efficiency in light load condition. NCP1239 features a timer-based fault detection circuitry that ensures a quasi-flat overload detection, independent of the input voltage. Features • Fixed-Frequency 65-kHz or 100-kHz Current-Mode Control Operation • Frequency Foldback Down to 26 kHz and Skip Mode to Maximize Performance in Light Load Conditions • Adjustable Over Power Protection (OPP) Circuit • High-Voltage Current Source with Brown-Out (BO) Detection • Internal Slope Compensation • Internal Fixed Soft-Start • Frequency Jittering in Normal and Frequency Foldback Modes • 64-ms Timer-Based Short-Circuit Protection with Auto-Recovery or Latched Operation • Pre-Short Ready for Latched OCP Versions • Latched OVP on VCC – Autorecovery for C and E Versions • Latched OVP/OTP Input for Improved Robustness • 35-V VCC Operation • ±500 mA Peak Source/Sink Drive Capability • Internal Thermal Shutdown • Extremely Low No-Load Standby Power • Pin-to-Pin Compatible with the Existing NCP1236/1247 Series • These Devices are Pb-Free and are RoHS Compliant Typical Applications • AC-DC Converters for TVs, Set-Top Boxes and Printers • Offline Adapters for Notebooks and Netbooks SOIC−7 CASE 751U PIN CONNECTIONS Fault 1 FB 2 CS 3 GND 4 8 HV 6 VCC 5 DRV MARKING DIAGRAM 8 1239xfff ALYWX G 1 1239xfff x A L Y W G = Specific Device Code = A, B, C, D, E, F, G, H, I, J, K, L, M, N, P, Q or R fff = 065 or 100 = Assembly Location = Wafer Lot = Year = Work Week = Pb−Free Package ORDERING INFORMATION See detailed ordering and shipping information on page 26 of this data sheet. © Semiconductor Components Industries, LLC, 2016 1 September, 2023 − Rev. 26 Publication Order Number NCP1239/D NCP1239 Vbulk OVP Vout . . . NCP1239 1 8 2 3 6 4 5 NTC OPP adjsut. Figure 1. Application Schematic (OPP Adjustment) 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. www.onsemi.com 2 NCP1239 Table 2. DEVICE OPTION AND DESIGNATIONS Device Frequency OCP OCP Vcc OVP Vcc OVP Fault pin Protection Timer Threshold Protection Protection BO Levels BO Timer Soft− start Timer DSS Function NCP1239AD65R2G 65 kHz Latch 64 ms 25.5 V Latch Latch 110 / 101 68 ms 8 ms Disable NCP1239BD65R2G 65 kHz Auto− 64 ms Recovery 25.5 V Latch Latch 110 / 101 68 ms 8 ms Disable NCP1239CD65R2G 65 kHz Auto− 64 ms Recovery 25.5 V Auto− Recovery Latch 110 / 101 68 ms 8 ms Disable NCP1239DD65R2G 65 kHz Auto− 64 ms Recovery 25.5 V Latch Latch 101 / 95 68 ms 8 ms Disable NCP1239ED65R2G 65 kHz Auto− 64 ms Recovery 25.5 V Auto− Auto− 110 / 101 68 ms 8 ms Disable Recovery Recovery NCP1239FD65R2G 65 kHz Latch 64 ms 32 V Latch Latch 229 / 176 68 ms 4 ms Disable NCP1239HD65R2G 65 kHz Latch 64 ms 25.5 V Latch Latch 229 / 224 68 ms 8 ms Disable NCP1239ID65R2G 65 kHz Latch 128 ms 25.5 V Latch Latch 101 / 95 68 ms 4 ms Disable NCP1239JD65R2G 65 kHz Latch 128 ms 32 V Latch Latch 101 / 95 68 ms 8 ms Enable NCP1239KD65R2G 65 kHz Auto− 128 ms 25.5 V Recovery .


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