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TEA1530AT Scheda tecnica(PDF) 7 Page - NXP Semiconductors |
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TEA1530AT Scheda tecnica(HTML) 7 Page - NXP Semiconductors |
7 / 21 page TEA1530T_AT_AP_1 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 01 — 30 June 2008 7 of 21 NXP Semiconductors TEA1530T/AT/AP GreenChip II SMPS control IC 7.5 Cycle skipping At very low power levels, a cycle skipping mode activates. An internal control voltage (Vsense(max)) lower than 25 mV will inhibit switch-on of the external power MOSFET until this voltage increases to a higher value; see Figure 5. 7.6 Continuous Conduction Mode (CCM) The IC operates in Fixed Frequency Continuous Conduction Mode (FF CCM). Pin DRAIN should be connected to the high voltage rectified mains VI; see Figure 8. 7.7 OverCurrent Protection (OCP) The primary peak current in the transformer is measured accurately cycle-by-cycle using the external sense resistor Rsense. The OCP circuit limits the voltage on pin SENSE to an internal level equal to 1.5 V − V CTRL (see also Section 7.3). The OCP detection is suppressed during the leading edge blanking period, tleb to prevent false triggering caused by the switch-on spikes. 7.8 Control pin protection If pin CTRL becomes open-circuit or is disconnected, a fault condition is assumed and the converter will stop switching immediately. Operation recommences when the fault condition is removed. 7.9 Adjustable slope compensation A slope compensation function has been added at pin CTRL; see Figure 6. The slope compensation function prevents subharmonic oscillation in CCM at duty cycles over 50 %. The CTRL voltage is modulated by sourcing a (non-constant) current out of pin CTRL and by adding externally a series resistor Rslopecomp. This increases the CTRL voltage proportionally with the on-time, which therefore limits the OCP level. A longer on-time results in a higher CTRL voltage, this increase in CTRL voltage will decrease the on-time. Slope compensation can be adjusted by changing the value of Rslopecomp. Slope compensation prevents modulation of the on-time (duty cycle) while operating in FF CCM. A possible drawback of subharmonic oscillation can be output voltage ripple. |
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