51 SCM-based PFM type switching power supply code, EXB840 used to drive the IGBT, 1602 show that the switching frequency can be directly through the keyboard input frequency step for the 0.5KHz.

Packet : 1191290351pfmswithpower.rar filelist
51PFMswithpower\51.c
51PFMswithpower\51.LST
51PFMswithpower\51.OBJ
51PFMswithpower\STARTUP.A51
51PFMswithpower\STARTUP.LST
51PFMswithpower\STARTUP.OBJ
51PFMswithpower\wz
51PFMswithpower\wz.hex
51PFMswithpower\wz.lnp
51PFMswithpower\wz.M51
51PFMswithpower\wz.Opt
51PFMswithpower\wz.plg
51PFMswithpower\wz.Uv2
51PFMswithpower\wz_Uv2.Bak
51PFMswithpower

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