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參數(shù)資料
| 型號： | ICE3BS02L |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell and Latched off Mode |
| 中文描述： | 離線式開關(guān)電源電流模式控制器，集成了500V啟動細胞和鎖存關(guān)閉模式 |
| 文件頁數(shù)： | 8/21頁 |
| 文件大?。?/td> | 517K |
| 代理商： | ICE3BS02L |
Version 1.1
8
28 Sep 2005
F3
ICE3BS02L
Functional Description
Thus it is ensured that at every startup cycle the voltage ramp
at pin SoftS starts at zero.
The internal Voltage Reference is switched off if Latched
Off Mode or Auto Restart Mode is entered. The current
consumption is then reduced to 300
μ
A.
Once the malfunction condition is removed, this block will
then turn back on. The recovery from Auto Restart Mode
does not require disconnecting the SMPS from the AC line.
In case Latched Off Mode is entered, VCC needs to be
lowered below 6V to reset the Latched Off Mode. This is
done usually by disconnecting the SMPS from the AC line.
When Active Burst Mode is entered the internal Bias is
switched off in order to reduce the current consumption
below 1.05mA while keeping the Voltage Reference still
active as this is necessary in this mode.
3.3
Startup Phase
Figure 4
Soft Start
At the beginning of the Startup Phase, the IC provides a Soft
Start duration whereby it controls the maximum primary
current by means of a duty cycle limitation. A signal V
SoftS
which is generated by the external capacitor C
Softs
in
combination with the internal pull up resistor R
SoftS
,
determines the duty cycle until V
SoftS
exceeds 4V.
When the Soft Start begins, C
SoftS
is immediately charged up
to approx. 1V by T2. Therefore the Soft Start Phase takes
place between 1V and 4V. Above V
SoftsS
= 4V there is no
longer duty cycle limitation DC
max
which is controlled by
comparator C7 since comparator C2 blocks the gate G7 (see
Figure 4). This maximum charge current in the very first
stage when V
SoftS
is below 1V, is limited to 1.32mA.
Figure 5
Startup Phase
By means of this extra charge stage, there is no delay in the
beginning of the Startup Phase when there is still no
switching. Furthermore Soft Start is finished at 4V to have
faster the maximum power capability. The duty cycles DC
1
and DC
2
are depending on the mains and the primary
inductance of the transformer. The limitation of the primary
current by DC
2
is related to V
SoftS
= 4V. But DC
1
is related
to a maximum primary current which is limited by the
internal Current Limiting with CS = 1V. Therefore the
maximum Startup Phase is divided into a Soft Start Phase
until t1 and a phase from t1 until t2 where maximum power
is provided if demanded by the FB signal.
Soft-Start
Comparator
Soft Start
&
G7
C7
C
SoftS
R
SoftS
T2
3.25k
6.5V
T3
1V
SoftS
Gate Driver
0.85V
x3.7
PWM OP
CS
4V
C2
DC
max
DC
1
DC
2
t
t
V
SoftS
max. Soft Start Phase
1V
4V
5.4V
max. Startup Phase
t1
t2
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