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TEA1733LT View Datasheet(PDF) - NXP Semiconductors.

Part Name
Description
Manufacturer
TEA1733LT
NXP
NXP Semiconductors. NXP
TEA1733LT Datasheet PDF : 20 Pages
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NXP Semiconductors
TEA1733T; TEA1733LT
GreenChip III SMPS control IC
tleb
Vsense(max)
VISENSE
Fig 8. Leading edge blanking
t
014aaa932
7.10 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.
At low output power levels, the overpower compensation circuit is switched off
(See Figure 9).
2
1.7
IISENSE
(μA)
0.68 1
2
3
4
VVINSENSE (V)
014aaa933
Fig 9. Overpower compensation using pins VINSENSE and ISENSE
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).
TEA1733T_TEA1733LT_2
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 02 — 26 March 2010
© NXP B.V. 2010. All rights reserved.
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