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NCP1075NONGEVB:  8W, DUAL, NON-ISOLATED EVALUATION BOARD


This evaluation board features an 8 watt, off-line, dual output, flyback power supply intended for powering white goods or industrial equipment circuitry which does not require output isolation from the AC mains. The flyback converter is designed around ON Semiconductor's 100 kHz NCP1075 monolithic switching controller. A simple voltage sensing and feedback scheme utilizing a current mirror transistor pair (Q1), and zener diode (Z1) is utilized for low cost yet effective output regulation for most typical applications.

This particular design example provides output voltages of 5V and 8.5V but these can be tailored to other voltages to accommodate the specific requirements by appropriate transformer turns ratio changes and alterations to voltage setting zener Z1 and resistor R6.
Features and Applications

Features

  • Schottky diodes (D6, D7) on both outputs for high efficiency
  • Dual sensing options depending on desired regulation accuracy
  • Input EMI filter for conducted emission compliance
  • Input fuse and inrush limiting resistor (R1)
  • Good load and cross regulation on 8.5Vout due to secondary winding technique on transformer
Evaluation/Development Tool Information
Product Status Compliance Short Description Parts Used Action
NCP1075NONGEVB Active
Pb-free
8W, DUAL, NON-ISOLATED EVALUATION BOARD MMSZ5229BT1G ,  NCP1075STBT3G , 
NST45011MW6T1G
Technical Documents
Type Document Title Document ID/Size Rev
Eval Board: BOM NCP1075NONGEVB Bill of Materials ROHS Compliant NCP1075NONGEVB_BOM_ROHS.PDF - 44.0 KB  0 
Eval Board: Gerber NCP1075NONGEVB Gerber Layout Files (Zip Format) NCP1075NONGEVB_GERBER.ZIP - 78.0 KB  0 
Eval Board: Schematic NCP1075NONGEVB Schematic NCP1075NONGEVB_SCHEMATIC.PDF - 41.0 KB  0 
Eval Board: Test Procedure NCP1075NONGEVB Test Procedure NCP1075NONGEVB_TEST_PROCEDURE.PDF - 66.0 KB  0 
Video 8W, Dual, Non-Isolated Evaluation Board - NCP1075NONGEVB Test Procedure WVD17501/D   
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8W, Dual, Non-Isolated Evaluation Board - NCP1075NONGEVB Test Procedure
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