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TEA1541P Datasheet(PDF) 7 Page - NXP Semiconductors |
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TEA1541P Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 19 page  2003 Aug 11 7 Philips Semiconductors Product specification SMPS control IC with synchronization function TEA1541 6.1 Start-up, mains voltage-dependent operation-enabling level and undervoltage lock-out Initially, the IC is supplied by the rectified mains voltage at pin VIN. When the voltage at pin VCC is below the VCC voltage for VIN current trip level VCC(trip)(VIN), the supply current drawn from pin VIN, (IVIN) is at the low value IVIN(min). When VCC rises to the VCC(trip)(VIN) level, the current at pin VIN changes to the high value IVIN(max). When the voltage at pin VIN is below the mains voltage-dependent operation-enabling level (M-level), the IC supply capacitor CVCC is charged by the internal start-up current source to approximately 5 V. When the voltage at pin VIN exceeds the M-level, the start-up current source continues to charge CVCC (switch S1 open; see Fig.2). When VCC reaches the start-up voltage level VCC(start), the IC switches to high efficiency (green function) operation by no longer drawing current from pin VIN (see Fig.5). At VCC(start) the IC activates the external MOSFET. When the voltage across the auxiliary winding rises above the voltage across CVCC, the IC supply current will be supplied by the auxiliary winding via pin VCC. If the voltage on pin VCC falls below the VCC undervoltage lock-out level VCC(UVLO), the IC stops switching and enters a safe restart mode in which current to the IC is supplied by the rectified mains voltage via pin VIN, and CVCC is re-charged by the internal start-up current source to VCC(start). Inhibiting the auxiliary supply by external means causes the converter to operate in a stable, well-defined burst mode. This is a burst standby mode that is less efficient than the normal burst standby mode described in section 6.12. If the voltage at pin VIN falls below the mains undervoltage lock-out level MUVLO, a safe restart mode is activated, and the IC stops switching. During normal operation (non-burst standby mode), the duty cycle of the IC, and thus the output power of the supply, is regulated by a control voltage at pin CTRL. If pin VCC is connected to ground, the IC switches to low power standby operation and the start-up current drawn via pin VIN reduces to 400 µA (typical). When the voltage on pin VCC rises above 700 mV (typical), the start-up current increases to 1 mA (typical). 6.2 Supply management All internal reference voltages are derived from a temperature compensated, on-chip bandgap. handbook, halfpage MDB085 synchronized operation unsynchronized operation VCO variable P(W) f (kHz) 6 25 50 VCO fixed Fig.4 Multi mode operation. handbook, halfpage M-level VIN VCC(start) VCC(trip)(VIN) VCC IVIN(max) IVIN(min) IVIN ICC MDB087 Fig.5 Start-up sequence. |
Número de pieza similar - TEA1541P |
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Descripción similar - TEA1541P |
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