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TEA1532T Arkusz danych(PDF) 8 Page - NXP Semiconductors |
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TEA1532T Arkusz danych(HTML) 8 Page - NXP Semiconductors |
8 / 27 page 9397 750 13113 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. Preliminary data sheet Rev. 01 — 28 May 2004 8 of 27 Philips Semiconductors TEA1532 GreenChip ™II SMPS control IC value of Rslopecomp. Slope compensation prevents modulation of the on-time (duty cycle) while operating in FF CCM. A possible drawback of sub-harmonic oscillation can be output voltage ripple. 7.11 Minimum and maximum on-time The minimum on-time of the SMPS is determined by the LEB time. The IC limits the on-time to a maximum time which is dependent on the mode of operation: QR mode: When the system requires an ‘on-time’ of more than 25 µs, a fault condition is assumed (e.g. CVCC removed), the IC stops switching and enters the safe restart mode. CCM: The driver duty cycle is limited to 70 %. So the maximum on-time is correlated to the oscillator time which results in an accurate limit of the minimum input voltage of the flyback converter. 7.12 PROTECT and timing input The PROTECT input (pin 3) is a multi-purpose (high-impedance) input, which can be used to switch off the IC and create a relatively long timing function. As soon as the voltage on this pin rises above 2.5 V, switching stops immediately. For the timing function, a current of typically 50 µA flows out of pin PROTECT and charges an external capacitor until the activation level of 2.5 V is reached. This current source however, is only activated when the converter is not in regulation, which is detected by the voltage on pin CTRL (VCTRL < 0.63 V). A (small) discharge current is also implemented to ensure that the capacitor is not charged, for example, by spikes, and a MOSFET switch is added to ensure a defined start situation. The voltage on pin CTRL determines whether the IC enters latched protection mode, or safe restart protection mode: Fig 7. Slope compensation. 001aaa830 CTRL −1 Slope compensation current 0.63 V control detect 5.6 V TEA1532 4 RCTRL Rslopecomp |
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