DN05029/D - 12 Volt, 30 Watt, Off-line Mini-Forward Converter Design Note

Reference Design using part NCP1251B by onsemi

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DN05029/D Schemtic.
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Manufacturer

onsemi
  • Application Category
    Power Supplies
  • Product Type
    AC to DC Single Output Power Supplies

For End Products

  • Electronic Meter
  • Industrial Equipments
  • Portable Instrumentation
  • White Goods

Description

  • DN05029/D, Design Note describes a simple, low cost, high performance, off-line forward converter power supply using NCP1251B flyback controller (TSOP6 package), NDD04N60 D-Pak Mosfet, and the NCP431 programmable zener (SOT23 package). This design is an extension of the mini-forward converter design described in Application Note AND8489 in which the NCP1028 monolithic switcher was used as the main controller. The use of an RCD snubber reset type of forward converter allows the extension of the useful duty cycle to over 50% without excessive voltage excursions across the MOSFET. The topology provides lower output ripple and noise, lower EMI generation and slightly higher efficiency than an equivalent 12V/2.5A flyback topology

Key Features

  • Conversion Type
    AC to DC
  • Input Voltage
    90 to 267 (AC) V
  • Output Voltage
    12 V
  • Output Current
    3 A
  • Output Power
    30 W
  • Efficiency
    84 %
  • Topology
    Forward

Featured Parts (5)

Featured Parts
Part Number Manufacturer Type Description
NCP431AVSNT1G onsemi Voltage References V-Ref Adjustable 2.5V to 36V 100mA 3-Pin SOT-23 T/R Buy
NCP431AISNT1G onsemi Voltage References V-Ref Adjustable 2.5V to 36V 100mA 3-Pin SOT-23 T/R Buy
NCP431ACSNT1G onsemi Voltage References V-Ref Adjustable 2.5V to 36V 100mA 3-Pin SOT-23 T/R Buy
NCP1251BSN65T1G onsemi AC to DC Switching Converters AC to DC Switching Converter Flyback 9.4V 65kHz T/R 6-Pin TSOP Buy
NCP1251BSN100T1G onsemi AC to DC Switching Converters AC to DC Switching Converter Flyback 9.4V 100kHz T/R 6-Pin TSOP Buy

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