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File under Integrated Circuits, IC Philips Semiconductors. I sense. VCC 1. GND 2. CTRL 3. DEM 4. The TEA is the controller of a compact flyback. The TEA operates in multi modes. The next converter stroke is started only after. To prevent very high frequency operation at lower loads,.
At very low power standby levels, the frequency is. Typically, 3 Watts can be achieved for a. Start-up, mains enabling operation level and. Initially, the IC is self supplying from the rectified mains.
Supply capacitor C VCC is charged. Once the. The IC will activate the power. V CC start level. The IC supply is taken over by the auxiliary. The moment the voltage on pin V CC drops below the. Inhibiting the auxiliary supply by external means causes. Supply management.
All internal reference voltages are derived from a. Start-up current source pin 8. BV DSS. V CC management pin 1. V CC start. V CC hys. I VCC restart. I CC operate. Demagnetization management pin 4. V DEM. I DEM. Pulse width modulator. V vco start. V vco max. Duty cycle control pin 3. V CTRL min. V CTRL max. An auxiliary winding of the transformer provides demagnetization detection and powers the IC after start-up.
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 continue charging capacitor C VCC switch S1 will be opened , see Fig.
The IC supply is taken over by the auxiliary winding as soon as the output voltage reaches its intended level and the IC supply from the mains voltage is subsequently stopped for high efficiency operation green function.
Inhibiting the auxiliary supply by external means causes the converter to operate in a stable, well-defined burst mode. Supply management All internal reference voltages are derived from a temperature compensated, on-chip band gap circuit.
PDF TEA1507P Datasheet ( Hoja de datos )
Archived content is no longer updated and is made available for historical reference only. A high level of integration leads to a cost effective power supply with a very low number of external components. The special built-in green functions allow the efficiency to be optimum at all power levels. This holds for quasi-resonant operation at high power levels, as well as fixed frequency operation with valley switching at medium power levels. At low power standby levels, the system operates at reduced frequency and with valley detection. The proprietary high voltage BCD process makes direct start-up possible from the rectified mains voltage in an effective and green way.
TEA1507P PDF Datasheet浏览和下载
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