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Troubleshooting and Design Tips for Fairchild Power Switch (FPSTM) Flyback Applications www.fairchildsemi.com ©2003 Fairchild Semiconductor Corporation Introduction This application note describes troubleshooting for problems that power supply engineers may encounter when operating FPS application circuits. This note helps engineers figure out causes and solutions to their problems starting with the symptoms. Some useful application tips are also provided. The following items are covered in this application note. Figure 1 shows the schematic of the basic off-line flyback converter using FPS, which also serves as the reference circui t for the troubleshooting described in this application note. It is also assumed that all the protection circuits within the FPS are in auto restart mode. Rev. 1.0.0
- When the power supply does not start.
operation when Vcc reaches its start voltage. (a) Symptom : Vcc does not reach the Vcc start voltage. FPS through the rectifier diode. Figure 1. Basic Off-line Flyback Converter Using FPS
- Application circuit to convert auto-restart
is fully discharged by the power off. Figure 15. Latch mode protection circuit
3/24/04 0.0m 002 2003 Fairchild Semiconductor Corporation DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPROATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com by Hang-Seok Choi / Ph. D Phone : +82-32-680-1383 Facsimile : +82-32-680-1317 E-mail : hschoi@fairchildsemi.co.kr