參數(shù)資料
型號(hào)： ICE3AS02G
廠商： INFINEON TECHNOLOGIES AG
英文描述： Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell
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(dòng)單元
文件頁數(shù)： 12/23頁
文件大小： 476K
代理商： ICE3AS02G
F3
ICE3AS02 / ICE3AS02G / ICE3BS02 / ICE3BS02G
Functional Description
Version 1.1
12
21 May 2004
Current Limiting is now possible in a very accurate way.
E.g. I
= 0.5A with R
= 2. Without Propagation
Delay Compensation the current sense threshold is set
to a static voltage level V
=1V. A current ramp of
dI/dt = 0.4A/μs, that means dV
/dt = 0.8V/μs, and a
propagation delay time of i.e. t
=180ns
leads then to an I
overshoot of 12%. By means of
propagation delay compensation the overshoot is only
about 2% (see Figure 13).
Figure 13
Overcurrent Shutdown
The Propagation Delay Compensation is realized by
means of a dynamic threshold voltage V
(see Figure
14). In case of a steeper slope the switch off of the
driver is earlier to compensate the delay.
Figure 14
Dynamic Voltage Threshold V
csth
3.6
Control Unit
The Control Unit contains the functions for Active Burst
Mode and Auto Restart Mode. The Active Burst Mode
and the Auto Restart Mode are combined with an
Adjustable Blanking Window which is depending on the
external Soft Start capacitor. By means of this
Adjustable Blanking Window, the IC avoids entering
into these two modes accidentally. Furthermore it also
provides a certain time whereby the overload detection
is delayed. This delay is useful for applications which
normally works with a low current and occasionally
require a short duration of high current.
3.6.1
Adjustable Blanking Window
Figure 15
Adjustable Blanking Window
V
is clamped at 4.4V by the closed switch S1 after
the SMPS is settled. If overload occurs V
is
exceeding 4.8V. Auto Restart Mode can’t be entered as
the gate G5 is still blocked by the comparator C3. But
after V
has exceeded 4.8V the switch S1 is opened
via the gate G2. The external Soft Start capacitor can
0,9
0,95
1
1,05
1,1
1,15
1,2
1,25
1,3
0
0,2
0,4
0,6
0,8
1
dV
Sense
1,2
1,4
1,6
1,8
2
with compensation
without compensation
dt
s
V
μ
S
V
V
t
V
csth
V
OSC
Signal1
Signal2
V
Sense
Propagation Delay
max. Duty Cycle
off time
t
C3
5.4V
C4
4.8V
C5
1.32V
&
G5
&
G6
4.4V
S1
1
G2
Control Unit
5k
Active
Burst
Mode
Auto
Restart
Mode
R
SoftS
6.5V
SoftS
FB
相關(guān)PDF資料
PDF描述
ICE3BS02 Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell
ICE3BS02G Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell
ICE3BS02L Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell and Latched off Mode
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