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ICE2A0565 Datasheet(Arkusz danych) 12 Page - Infineon Technologies AG

Numer części ICE2A0565
Szczegółowy opis  Off-Line SMPS Current Mode Controller with integrated 650V/800V CoolMOS
Pobierz  36 Pages
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Producent  INFINEON [Infineon Technologies AG]
Strona internetowa  http://www.infineon.com
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 12 page
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Version 2.6
12
25 Dec 2006
CoolSET™-F2
Functional Description
Figure 11 PWM Controlling
3.3
Soft-Start
Figure 12 Soft-Start Phase
The Soft-Start is realized by the internal pull-up resistor
RSoft-Start and the external Capacitor CSoft-Start (see
Figure 5). The Soft-Start voltage VSoftS is generated by
charging the external capacitor CSoft-Start by the internal
pull-up 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 resetting the PWM-Latch (see
Figure 12). 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 has a clamp voltage of 5.6V to
prevent the internal circuit from saturation (see Figure
13).
Figure 13 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 14).
By means of Soft-Start there is an effective
minimization of current and voltage stresses on the
integrated CoolMOS™, 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
CSoft Start
TSoft Start
RSoft Start
1.69
×
-------------------------------------
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