Cmo reemplazar circuitos integrados en fuentes conmutadas. Las fuentes de alimentacin evolucionan constantemente; ahora son ms pequeas, eficientes y generan menos calor que las fuentes de alimentacin lineales. Toda esta nueva tecnologa en fuentes conmutadas de equipos electrnicos modernos, implica el uso de ms y nuevos semiconductores, como los circuitos integrados osciladores o controladores. Desplazando definitivamente al voluminoso y pesado transformador presente en las fuentes lineales. La mayora de estos circuitos integrados posee solo 8 pines o patillas, los cuales pueden usar un FET de potencia interno o externo. Algunos poseen caractersticas muy curiosas, como el hecho de no tener un terminal de VCC ni disipador de calor, en algunos casos.
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An auxiliary winding of the transformer provides demagnetization detection and powers the IC after start-up. The TEA operates in multi modes. The next converter stroke is started only after demagnetization of the transformer current zero current switching , while the drain voltage has reached the lowest voltage to prevent switching losses green function.
The primary resonant circuit of primary inductance and drain capacitor ensures this quasi-resonant operation. The design can be optimized in such a way that zero voltage switching can be reached over almost the universal mains range. To prevent very high frequency operation at lower loads, the quasi-resonant operation changes smoothly in fixed frequency PWM control.
At very low power standby levels, the frequency is controlled down, via the VCO, to a minimum frequency of about 6 kHz. Typically, 3 Watts can be achieved for a 75 W converter with an output power of mW.
Start-up, mains enabling operation level and undervoltage lock out see Figs. Supply capacitor C VCC is charged by the internal start-up current source to a level of about 4 V or higher, depending on the drain voltage.
Once the drain voltage exceeds the M-level mains-dependent operation-enabling level , the start-up current source will.
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