TEA1738T_TEA1738LT

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Preliminary data sheet

Rev. 1 — 31 December 2010

9 of 21

NXP Semiconductors

TEA1738T; TEA1738LT

GreenChip SMPS control IC

Leading edge blanking prevents false triggering due to capacitive discharge when

switching on the external power switch (see Figure 8).

7.11 Overpower or high/low line compensation

(VINSENSE and ISENSE pins)

The overpower compensation function can be used to realize a maximum output power

which is nearly constant over the full input mains.

The overpower compensation circuit measures the input voltage on the VINSENSE pin

and outputs a proportionally dependent current on the ISENSE pin. The DC voltage

across the soft start resistor limits the maximum peak current on the current sense resistor

(see Figure 9).

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

Fig 7.

Peak current control

Fig 8.

Leading edge blanking

frequency

reduction

0.2

0.4

0.6

0

04

3

12

014aab293

(V)

frequency

reduction

frequency

increase

t

014aaa932