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參數(shù)資料
| 型號： | ICE2A380P2 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | Off-Line SMPS Current Mode Controller with integrated 800V CoolMOS⑩ |
| 中文描述： | ⑩離線開關(guān)電源電流模式控制器，集成了800V的的CoolMOS |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 463K |
| 代理商： | ICE2A380P2 |
Version 0.0
9
23 Sep 2004
CoolSET-F2
ICE2A380P2
Functional Description
Figure 8
PWM Controlling
3.3
Soft-Start
Figure 9
Soft-Start Phase
The Soft-Start is realized by the internal pull-up 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
pull-up 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 resetting 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 has a clamp voltage of 5.6V 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
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
C
Soft
Start
–
T
×
–
R
Soft
Start
–
1.69
------------------------------------
=
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