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ICE2AS01 Datasheet(PDF) 9 Page - Infineon Technologies AG

Part No. ICE2AS01
Description  PWM-FF IC
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Maker  INFINEON [Infineon Technologies AG]
Homepage  http://www.infineon.com
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 9 page
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Version 2.0
9
1 Feb 2002
ICE2AS01/G
ICE2BS01/G
Functional Description
Figure 8
PWM Controlling
3.3
Soft-Start
Figure 9
Soft-Start Phase
The Soft-Start is realized by the internal pullup resistor
R
Soft-Start
and the external Capacitor C
Soft-Start
(see
Figure 2). The Soft-Start voltage V
SoftS is generated by
charging the external capacitor C
Soft-Start by the internal
pullup resistor R
Soft-Start.
The Soft-Start-Comparator
compares the voltage at pin SoftS at the negative input
with the ramp signal of the PWM-OP at the positive
input. When Soft-Start voltage V
SoftS
is less than
Feedback voltage V
FB the Soft-Start-Comparator limits
the pulse width by reseting the PWM-Latch (see Figure
9). In addition to Start-Up, Soft-Start is also activated at
each restart attempt during Auto Restart. By means of
the above mentioned C
Soft-Start the Soft-Start can be
defined by the user. The Soft-Start is finished when
V
SoftS exceeds 5.3V. At that time the Protection Unit is
activated by Comparator C4 and senses the FB by
Comparator C3 wether the voltage is below 4.8V which
means that the voltage on the secondary side of the
SMPS is settled. The internal Zener Diode at SoftS with
breaktrough voltage of 5.6V is to prevent the internal
circuit from saturation (see Figure 10).
Figure 10
Activation of Protection Unit
The Start-Up time T
Start-Up within the converter output
voltage V
OUT is settled must be shorter than the Soft-
Start Phase T
Soft-Start (see Figure 11).
By
means
of
Soft-Start
there
is
an
effective
minimization of current and voltage stresses on the
external Power Switch, the clamp circuit and the output
overshoot and prevents saturation of the transformer
during Start-Up.
x3 .6 5
PW M O P
Im proved
Current M ode
P W M C om para tor
Is ense
S o ft-S ta rt C o m p ara to r
6.5V
PW M -L atch
0.8V
FB
O ptocoupler
R
FB
t
5.3V
V
SoftS
Ga te D rive r
t
T
S oft-S tart
5.6V
6.5 V
R
FB
6.5V
P o we r-Up R e s e t
C4
5.3 V
C3
4.8 V
R
S o ft-S ta rt
FB
R
S
Q
Q
Erro r-La tc h
R
S
Q
Q
P W M -Latc h
G2
Clo c k
Ga te
Driv e r
5.6V
SoftS
69
,
1
×
=
Start
Soft
Start
Soft
Start
Soft
R
T
C




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