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TEA1532P 数据表(PDF) 10 Page - NXP Semiconductors |
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TEA1532P 数据表(HTML) 10 Page - NXP Semiconductors |
10 / 27 page 9397 750 13113 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. Preliminary data sheet Rev. 01 — 28 May 2004 10 of 27 Philips Semiconductors TEA1532 GreenChip ™II SMPS control IC 7.14 Brown-out protection During the so called brown-out test, the input voltage is slowly decreased. Since the on-time depends on Vi, overlong on-times at low Vi can damage the (external) power device. This is prevented by stopping the converter when the input voltage drops too low. When the voltage on pin DEM drops below −50 mV during the on-time (QR mode), the maximum on-time is set to 25 µs. The maximum on-time will be reached while V i is low. Subsequently, the IC stops switching and VCC drops below VUVLO. Capacitor CVCC will only be recharged and the supply will restart only when voltage Vi is high enough (Vm, also see Section 7.1). In addition to this, a Vi level at which the converter has to enter a safe restart can be set with a demag resistor. During the primary stroke, the rectified mains input voltage is measured by sensing the current drawn from pin DEM. This current depends on the mains voltage, according to the following formula: Where: The latter function requires an on-time of at least 2 µs. This on-time ensures that a reliable demag current can be measured. (1) Start of new cycle at lowest drain voltage. (2) Start of new cycle in a classical PWM system at high drain voltage. Fig 8. Signals for valley switching. drain secondary stroke mgu235 secondary ringing primary stroke valley (2) (1) secondary stroke oscillator I DEM () V aux R DEM --------------- NV mains × R DEM -------------------------- ≈≈ N N aux N p ------------ = |
类似零件编号 - TEA1532P |
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类似说明 - TEA1532P |
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