TEA1750_2
?NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 15 December 2008
16 of 29
NXP Semiconductors
TEA1750
GreenChip III SMPS control IC
7.3.6 Soft start-up (pin FBSENSE)
To prevent audible transformer noise during start-up, the transformer peak current, I
DM
is
slowly increased by the soft start function. This can be achieved by inserting a resistor
and a capacitor between pin FBSENSE and the current sense resistor.
An internal current source charges the capacitor to V = I
start(soft)(fb)
x R
SS2
, with a
maximum of approximately 0.5 V.
The start level and the time constant of the increasing primary current level can be
adjusted externally by changing the values of R
SS2
and C
SS2
.
The soft start current I
start(soft)(fb)
is switched on as soon as V
CC
reaches V
startup
. When the
voltage on the VOSENSE pin reaches the V
start(fb)
level and the voltage on pin FBSENSE
has reached 0.5 V, the yback converter starts switching.
The soft start current ows as long as the voltage on pin FBSENSE is below
approximately 0.5 V. If the voltage on pin FBSENSE exceeds 0.5 V, the soft start current
source starts limiting the current. After the yback converter has started, the soft start
current source is switched off.
a. Circuit diagram
b. Timing diagram
Fig 11. Time-out protection
014aaa049
FBCTRL
2.5 V
4.5 V
30 礎
3 k&
3.5 V
TIMEOUT
014aaa050
4.5 V
2.5 V
V
FBCTRL
output
voltage
intended output
voltage not
reached within
time-out time.
intended output voltage
reached within time-out
time.
restart
?/DIV>
SoftStart
3 R
SS2
?/DIV>
C
SS2
?/DIV>
=
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