This post describes for the semiconductor 1M0380R.
The function of this semiconductor is KA1M0380R.
The package is TO-220F-4L.
The manufacturer of this part is Fairchild.
See the preview image and the 1M0380R Datasheet PDF file for more information.
The SPS product family is specially designed for an off-line SMPS with minimal external components. The SPS consist of high voltage power SenseFET and current mode PWM controller IC. PWM controller features integrated fixed oscillator, under voltage lock out, leading edge blanking, optimized gate turn-on/turn-off driver, thermal shut down protection, over voltage protection, temperature compensated precision current sources for loop compensation and fault protection circuit.
• Precision fixed operating frequency
• KA1L0380B/KA1L0380RB (50KHz)
• KA1M0380RB (67KHz)
• KA1H0380RB (100KHz)
• Pulse by pulse over current limiting
• Over load protection
• Over voltage protection (Min. 23V)
• Internal thermal shutdown function
• Under voltage lockout
• Internal high voltage sense FET