TEA1733AT 데이터 시트보기 (PDF) - NXP Semiconductors.

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TEA1733AT

GreenChip SMPS control IC

NXP Semiconductors. 

NXP Semiconductors

2

1.7

IISENSE

(μA)

TEA1733AT

GreenChip SMPS control IC

0.68 1

Fig 8. Overpower compensation

2

3

4

VVINSENSE (V)

014aaa933

At low output power levels the overpower compensation circuit is switched off.

7.11 Soft start-up (ISENSE pin)

A soft start is made to prevent audible noise during start-up or a restart condition. Before

the converter starts, the soft start capacitor C6 (see Figure 3) on the ISENSE pin is

charged. When the converter starts switching, the primary peak current slowly increases

as the soft start capacitor discharges through the soft start resistor (R6, see Figure 3).

The soft start time constant is set by the soft start capacitor value chosen. The soft start

resistor value must also be taken into account, but this value is typically defined by the

overpower compensation (see Section 7.10).

7.12 Low power operation

In low power operation switching losses are reduced by lowering the switching frequency.

The converter switching frequency is reduced and the peak current is set to 25 % of the

maximum peak current (see Figure 6 and Figure 9).

fsw

(kHz)

switching

frequency

Fig 9. Frequency control

1

2

VCTRL (V)

014aaa934

TEA1733AT

Preliminary data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 2 — 19 November 2010

© NXP B.V. 2010. All rights reserved.

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