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TEA1506P 数据表(PDF) 10 Page - NXP Semiconductors |
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TEA1506P 数据表(HTML) 10 Page - NXP Semiconductors |
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10 / 22 page  2003 Sep 09 10 Philips Semiconductors Product specification GreenChip ™II SMPS control IC TEA1506P; TEA1506AP; TEA1506T; TEA1506AT OverCurrent Protection (OCP) The cycle-by-cycle peak drain current limit circuit uses the external source resistor to measure the current accurately. This allows optimum size determination of the transformer core (cost issue). The circuit is activated after the leading edge blanking time, tleb. The OCP circuit limits the ‘sense’ voltage to an internal level. OverPower Protection (OPP) During the primary stroke, the rectified mains input voltage is measured by sensing the current drawn from pin DEM. This current is dependent on the mains voltage, according to the following formula: where: The current information is used to adjust the peak drain current, which is measured via pin Isense. The internal compensation is such that an almost mains independent maximum output power can be realized. The OPP curve is given in Fig.10. Short winding protection After the leading edge blanking time, the short winding protection circuit is activated. If the ‘sense’ voltage exceeds the short winding protection voltage Vswp, the converter will stop switching. Once VCC drops below the UVLO level, capacitor CVCC will be recharged and the supply will restart again. This cycle will be repeated until the short-circuit is removed (safe restart mode). The short winding protection will also protect in case of a secondary diode short-circuit. OverTemperature Protection (OTP) An accurate temperature protection is provided in the circuit. When the junction temperature exceeds the thermal shutdown temperature, the IC will enter the safe restart mode. When the Vstart level is reached, switching starts again. This process is repeated as long as the OTP condition exists. I DEM V aux R DEM --------------- NV mains × R DEM -------------------------- ≈≈ N N aux N p ------------ = handbook, halfpage MGU236 0.52 V (typ) 0.3 V (typ) IDEM Vsense(max) −24 µA (typ) −100 µA (typ) Fig.10 OPP correction curve. |
类似零件编号 - TEA1506P |
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类似说明 - TEA1506P |
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