tea1753t NXP Semiconductors, tea1753t Datasheet - Page 17
tea1753t
Manufacturer Part Number
tea1753t
Description
Tea1753t Greenchip Iii Smps Control Ic
Manufacturer
NXP Semiconductors
Datasheet
1.TEA1753T.pdf
(31 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
TEA1753T
Manufacturer:
NXP/恩智浦
Quantity:
20 000
NXP Semiconductors
TEA1753T
Objective data sheet
7.3.6 Soft start-up (pin FBSENSE)
To prevent audible transformer noise during start-up, the transformer peak current, I
slowly increased by the soft start function. This can be achieved by inserting a resistor and
a capacitor between pin 10 (FBSENSE) and the current sense resistor.
An internal current source charges the capacitor to:
with a maximum of approximately 0.63 V.
The start level and the time constant of the increasing primary current level can be
adjusted externally by changing the values of R
The soft start current I
voltage on pin FBSENSE has reached 0.63 V the flyback converter starts switching.
V
softstart
Fig 12. Time-out protection circuit
Fig 13. Time-out protection (signals), safe restart in the TEA1753T
=
I
start soft
=
V
fb
3
FBCTRL
time-out
voltage
output
All information provided in this document is subject to legal disclaimers.
R
R
SS2
SS2
start(soft)fb
Rev. 01 — 4 March 2011
C
SS2
4.5 V
intended output
reached within
time-out time.
voltage not
2.5 V
is switched on as soon as V
3.5 V
3 kΩ
restart
SS2
30 μA
and C
intended output voltage
reached within time-out
FBCTRL
GreenChip III SMPS control IC
SS2
CC
.
time.
reaches V
4.5 V
2.5 V
TEA1753T
014aaa049
014aaa050
© NXP B.V. 2011. All rights reserved.
startup
. When the
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