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TEA1530AT 데이터시트(PDF) 6 Page - NXP Semiconductors |
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TEA1530AT 데이터시트(HTML) 6 Page - NXP Semiconductors |
6 / 22 page © Koninklijke Philips Electronics N.V. 2005. All rights reserved. Objective data sheet Rev. 01 — 18 May 2005 6 of 22 Philips Semiconductors TEA1530AT 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 the so-called Fixed Frequency Continuous Conduction Mode (FF CCM). Pin DRAIN should be connected to the rectified Vi voltage; 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 1.5V - Vctrl (also see 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 sub-harmonic 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 sub-harmonic oscillation can be output voltage ripple. |
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