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At very low power standby levels, the frequency is. To prevent very high frequency operation at lower loads.
Duty cycle control pin 3. V CC start level. File under Integrated Circuits, IC 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.
To prevent very high frequency operation at lower loads, the quasi-resonant operation changes smoothly in fixed frequency PWM control.
Start-up current source pin 8.
TEAP Datasheet Philips Semiconductors pdf data sheet FREE from
Supply management All internal reference voltages are derived from a temperature compensated, on-chip band gap circuit. Inhibiting the auxiliary supply by external means causes the converter fea1507p operate in tfa1507p stable, well-defined burst mode. Typically, 3 Watts can be achieved for a 75 W converter with an output power of mW. The next converter stroke is started only after demagnetization of the transformer current zero current switchingwhile the drain voltage has reached the lowest voltage to prevent switching losses green function.
At very low power tea107p levels, the frequency is controlled down, via the VCO, to a minimum frequency of about 6 kHz. Supply capacitor C VCC is charged. The primary resonant circuit of primary inductance and drain capacitor ensures this quasi-resonant operation. Demagnetization management pin 4. V CC management pin 1. Initially, the IC is self supplying from the rectified mains.
The TEA operates in multi modes. Start-up, mains enabling operation level and undervoltage lock out see Figs. Inhibiting the auxiliary supply by external means causes.
The moment the voltage on pin V CC drops below the. Once the drain voltage exceeds the M-level mains-dependent operation-enabling levelthe tea1507o current source will continue charging capacitor C VCC switch S1 will be openedsee Fig.
All internal reference voltages are derived from a. Start-up, mains enabling operation level and.
An auxiliary winding of the transformer provides demagnetization detection and powers the IC after start-up. The IC supply is taken over by the auxiliary. The TEA is the controller of a compact flyback.
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Typically, 3 Watts can be achieved for a. The design can be optimized in such a way that zero voltage switching can be reached over almost the universal mains range. Supply capacitor C VCC is charged by rea1507p internal start-up current source to a level of about 4 V or higher, depending on the drain voltage. The IC will activate the power. The next converter stroke is started only after.