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TEA1532T датащи(PDF) 9 Page - NXP Semiconductors |
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TEA1532T датащи(HTML) 9 Page - NXP Semiconductors |
9 / 27 page 9397 750 13113 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. Preliminary data sheet Rev. 01 — 28 May 2004 9 of 27 Philips Semiconductors TEA1532 GreenChip ™II SMPS control IC • When the voltage on pin CTRL is below 0.63 V, the IC is assumed to be out of regulation (e.g. the control loop is open). In this case activating pin PROTECT (VPROTECT > 2.5 V) will cause the converter to stop switching. Once VCC drops below VUVLO, capacitor CVCC will be recharged and the supply will restart. This cycle will be repeated until the fault condition is removed (safe restart mode) • When the voltage on pin CTRL is above 0.63 V, the IC is assumed to be in regulation. In this case activating pin PROTECT (VPROTECT > 2.5 V), by external means, will latch the IC: The voltage on pin VCC will cycle between Vstart and VUVLO, but the IC will not start switching again until the latch function is reset. The latch is reset as soon as VCC drops below 4.5 V (typical value). The internal overtemperature protection will also trigger this latch; see also Figure 1. A voltage higher than 3 V on pin PROTECT will always latch the IC. This is independent of the state of the IC. 7.13 Valley switching Refer to Figure 8. A new cycle starts when the power switch is activated. After the on-time (determined by the sense voltage and the internal control voltage), the switch is opened and the secondary stroke starts. After the secondary stroke, the drain voltage shows an oscillation with a frequency of approximately where Lp is the primary self inductance of the transformer and Cd is the capacitance on the drain node. As soon as the oscillator voltage is high again and the secondary stroke has ended, the circuit waits for the lowest drain voltage before starting a new primary stroke. This method is called valley detection. Figure 8 shows the drain voltage, valley signal, secondary stroke signal and the oscillator signal. In an optimum design, the reflected secondary voltage on the primary side will force the drain voltage to zero. Thus, zero voltage switching is possible, preventing large capacitive switching losses , and allowing high frequency operation, which results in small and cost effective magnetics. 1 2 π × L p C d × ( ) × ( ------------------------------------------------- P 1 2 --- CV 2 × f × × = |
Аналогичный номер детали - TEA1532T |
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Аналогичное описание - TEA1532T |
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