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2AS01 Datasheet(PDF) 9 Page - Infineon Technologies AG

Part # 2AS01
Description  Off-Line SMPS Current Mode Controller
PDF  24 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

2AS01 Datasheet(HTML) 9 Page - Infineon Technologies AG

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Datasheet
9
30 Jun 2006
Preliminary Data
ICE2AS01/S01G
ICE2BS01/S01G
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
RSoft-Start and the external Capacitor CSoft-Start (see
Figure 2). The Soft-Start voltage VSoftS is generated by
charging the external capacitor CSoft-Start by the internal
pullup resistor RSoft-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 VSoftS is less than
Feedback voltage VFB 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 CSoft-Start the Soft-Start can be
defined by the user. The Soft-Start is finished when
VSoftS 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
breakthrough 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 TStart-Up within the converter output
voltage VOUT is settled must be shorter than the Soft-
Start Phase TSoft-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.
x3.65
PWM OP
Improved
Current Mode
PWM Comparator
Isense
Soft-Start Comparator
6.5V
PWM-Latch
0.8V
FB
Optocoupler
R
FB
t
5.3V
V
SoftS
Gate Driver
t
T
Soft-Start
5.6V
6.5V
R
FB
6.5V
Power-Up Reset
C4
5.3V
C3
4.8V
R
Soft-Start
FB
R
S
Q
Q
Error-Latch
R
S
Q
Q
PWM-Latch
G2
Clock
Gate
Driver
5.6V
SoftS
69
,
1
×
=
−
−
−
Start
Soft
Start
Soft
Start
Soft
R
T
C



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