35W set-top box switching power supply circuit with 5 outputs consisting of LTV817 and TOP233 and TL431 - power supply circuit - circuit diagram -

Full-range MOS power IC

Industrial Router Crystal 3.2×2.5mm 3225 26M (26.000MHz) 12PF 10PPM 20PPM 30PPM

The probe capacitor polarity needle has a head diameter of 5.8. The total length of the 7-pin and 12-pin needles is 5.

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, while the remaining channels serve as 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 wider voltage input range (u = 85~265V) is used, the total output power decreases by 25W. This power supply can be applied in set-top boxes, VCRs, camcorders (CVCRs), and DVD players. The efficiency of the set-top box switching power supply exceeds 77%, featuring both undervoltage and overvoltage protection mechanisms.