TEA1833LTS

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© NXP Semiconductors N.V. 2015. All rights reserved.

Product data sheet

Rev. 1 — 31 August 2015

11 of 24

NXP Semiconductors

TEA1833LTS

GreenChip SMPS control IC

To avoid activation at low loads, the OSCP is only enabled when the overpower timer is

OVP level.

is measured.

To limit the input power during a short circuit or an overload event, the OPP time is

reduced to 50 % when OSCP is enabled.

7.12 Peak power, high-power medium power, and low-power operation

During high-power operation, with the converter running at a 65 kHz (typical) fixed

frequency, the power is controlled by varying the peak current.

A peak power mode is implemented to supply a short overload situation. In peak power

mode, both frequency and peak current are increased.

In medium power operation, lowering the switching frequency to 25 kHz reduces the

switching losses.

In low-power operation, lowering of the switching frequency to below 25 kHz further

reduces switching losses. The switching frequency of the converter is reduced while the

peak current is set to 22 % of the maximum peak current (see Figure 8 and Figure 12).

Fig 12. Frequency control