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TEA1738FT View Datasheet(PDF) - NXP Semiconductors.

Part Name
Description
Manufacturer
TEA1738FT
NXP
NXP Semiconductors. NXP
TEA1738FT Datasheet PDF : 20 Pages
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NXP Semiconductors
TEA1738FT
GreenChip SMPS control IC
tleb
Vsense(max)
VISENSE
Fig 7. Leading edge blanking
t
014aaa932
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 8).
At low output power levels the overpower compensation circuit is switched off.
2
1.7
IISENSE
(μA)
0.68 1
Fig 8. Overpower compensation
2
3
4
VVINSENSE (V)
014aaa933
7.12 Soft start-up (ISENSE pin)
A soft start is performed to prevent audible noise during start-up or a restart condition.
Before the converter (re)starts, the soft start capacitor C6 (see Figure 3) on the ISENSE
pin is charged. When the converter (re)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 7.11).
TEA1738FT
Preliminary data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 30 December 2010
© NXP B.V. 2010. All rights reserved.
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