LW817, TOP233, TL431 35W set-top box switching power supply circuit with 5 outputs
The five voltages are: Uo1 (+30V, 100mA), Uo2 (+18V, 550mA), Uo3 (+5V, 2.5A), Uo4 (+3.3V, 3A), Uo5 (-5V, 100mA). Among them, +5V and +3.3V are the main outputs, and the remaining channels are the auxiliary outputs. When the AC input voltage u=220 (1±15%)V, the total output power of the switching power supply reaches 38.5W. If a wide range voltage input (u=85~265V) is used, the total output power is reduced by 25W. It can be used as a switching power supply in set-top boxes, video recorders (VCRs), camcorders (CVCRs), and DVD players. The set-top box switching power supply is more than 77% efficient and has undervoltage and overvoltage protection.
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