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TEA1530AP/N2,112

GreenChip II SMPS control IC

NXP Semiconductors. 

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 − VCTRL (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.

TEA1530T_AT_AP_1

Product data sheet

Rev. 01 — 30 June 2008

© NXP B.V. 2008. All rights reserved.

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