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TEA1530AT Scheda tecnica(PDF) 7 Page - NXP Semiconductors

Il numero della parte TEA1530AT
Spiegazioni elettronici  GreenChip II SMPS control IC
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Produttore elettronici  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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TEA1530AT Scheda tecnica(HTML) 7 Page - NXP Semiconductors

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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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