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TEA1552 데이터시트(PDF) 8 Page - NXP Semiconductors |
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TEA1552 데이터시트(HTML) 8 Page - NXP Semiconductors |
8 / 24 page 2002 Aug 27 8 Philips Semiconductors Product specification GreenChip ™II SMPS control IC TEA1552 Operation only recommences when the VCC voltage drops below a level of approximately 4.5 V (practically when the Vmains has been disconnected for a short period). The output voltage (VOVP) at which the OVP function trips, can be set by the demagnetization resistor RDEM: where Ns is the number of secondary turns and Naux is the number of auxiliary turns of the transformer. Current IOVP(DEM) is internally trimmed. The value of the demagnetization resistor (RDEM) can be adjusted to the turns ratio of the transformer, thus making an accurate OVP possible. Valley switching (see Fig.8) A new cycle starts when the power switch is switched on. After the ‘on-time’ (which is 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. V OVP N s N aux ------------ I OVP DEM () R DEM V clamp DEM () pos () + × [] × = 1 2 π × L p C d × () × () ---------------------------------------------------- handbook, full pagewidth drain secondary stroke MGU235 secondary ringing primary stroke valley BA secondary stroke oscillator A: Start of new cycle at lowest drain voltage. B: Start of new cycle in a classical PWM system at high drain voltage. Fig.8 Signals for valley switching. |
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