參數(shù)資料
型號(hào)： 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(dòng)細(xì)胞和鎖存關(guān)閉模式
文件頁(yè)數(shù)： 11/21頁(yè)
文件大?。?/td> 517K
代理商： ICE3BS02L
F3
ICE3BS02L
Functional Description
Version 1.1
11
28 Sep 2005
within a wide range. Current Limiting is now possible in a
very accurate way.
E.g. I
peak
= 0.5A with R
Sense
= 2. Without Propagation Delay
Compensation the current sense threshold is set to a static
voltage level V
csth
=1V. A current ramp of
dI/dt = 0.4A/μs, that means dV
Sense
/dt = 0.8V/μs, and a
propagation delay time of i.e. t
Propagation Delay
=180ns leads
then to an I
peak
overshoot of 14.4%. By means of propagation
delay compensation the overshoot is only about 2% (see
Figure 12).
Figure 12
Overcurrent Shutdown
The Propagation Delay Compensation is realized by means
of a dynamic threshold voltage V
csth
(see Figure 13). In case
of a steeper slope the switch off of the driver is earlier to
compensate the delay.
V
OSC
max. Duty Cycle
Figure 13
Dynamic Voltage Threshold V
csth
3.6
Control Unit
The Control Unit contains the functions for Active Burst
Mode, Auto Restart Mode and Latched Off 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 14
Adjustable Blanking Window
V
SoftS
is clamped at 4.4V by the closed switch S1 after the
SMPS is settled. If overload occurs V
FB
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
FB
has exceeded
4.8V the switch S1 is opened via the gate G2. The external
Soft Start capacitor can now be charged further by the
integrated pull up resistor R
SoftS
. The comparator C3 releases
the gates G5 and G6 once V
Softs
has exceeded 5.4V.
Therefore there is no entering of Auto Restart Mode possible
during this charging time of the external capacitor C
SoftS
. The
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
Signal1
Signal2
V
Sense
Propagation Delay
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
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