參數(shù)資料
型號: ICE3A1565L
廠商: INFINEON TECHNOLOGIES AG
英文描述: Off-Line SMPS Current Mode Controller with integrated 650V Startup Cell/Depletion CoolMOS⑩ and Latched off Mode
中文描述: 離線式開關電源電流模式控制器,集成了?650V啟動細胞/消耗的CoolMOS⑩和鎖存關閉模式
文件頁數(shù): 8/28頁
文件大?。?/td> 525K
代理商: ICE3A1565L
CoolSET-F3
ICE3xxx65L
Functional Description
Version 2.0
8
8 May 2006
The maximum current consumption before the
controller is activated is about 160
μ
A.
When V
VCC
falls below the off-threshold V
CCoff
=8.5V the
internal reference is switched off and the Power Down
reset let T1 discharging the soft-start capacitor C
at
pin SoftS. 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
, determines the duty cycle until V
SoftS
exceeds 4V.
When the Soft Start begins, C
is immediately
charged up to approx. 1V by T2. Therefore the Soft
Start Phase takes place between 1V and 4V. Above
V
= 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 1.30mA.
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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