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)： 14/21頁(yè)
文件大?。?/td> 517K
代理商： ICE3BS02L
F3
ICE3BS02L
Functional Description
Version 1.1
14
28 Sep 2005
outside the operating range > 4.8V, e.g. when Open Loop
happens. This means any small voltage overshoots of V
VCC
during normal operating can not start the Latched Off Mode.
The internal Voltage Reference is switched off once Latched
Off Mode is entered in order to reduce the current
consumption of the IC as much as possible. Latched Off
Mode can only be reset by decreasing V
VCC
< 6V. In this
stage, only the UVLO is working which controls the Startup
Cell by switching on/off at V
VCCon
/V
VCCoff
. During this
phase, the average current consumption is only 300
μ
A. As
there is no longer a self- supply by the auxiliary winding,
VCC drops. The Undervoltage Lockout switches on the
integrated Startup Cell when VCC falls below 8.5V. The
Startup Cell is switched off again when VCC has exceeded
15V. Once the Latched Off Mode was entered, there is no
Start Up Phase after VCC has exceeded the switch-on level
of the Undervoltage Lockout. Therefore VCC changes
between the switch-on and switch-off levels of the
Undervoltage Lockout with a saw tooth shape (see Figure
18).
Figure 18
Signals in Latched Off Mode
The Thermal Shutdown block monitors the junction
temperature of the IC. After detecting a junction temperature
higher than 140°C, Latched Off Mode is entered.
The signals coming from the temperature detection and VCC
overvoltage detection are fed into a spike blanking with a
time constant of 8.0
μ
s to ensure system reliability.
Furthermore, a short winding or short diode on the secondary
side can be detected by the comparator C11 which is in
parallel to the propagation delay compensated current limit
comparator C10. In normal operating mode comparator C10
keeps the maximum level of the CS signal at 1V. If there is
a failure such as short winding or short diode, C10 is no
longer able to limit the CS signal at 1V. C11 detects then the
over current and enters immediately the Latched Off Mode
to keep the SMPS in a safe stage.
3.6.3.2
Auto Restart Mode
Figure 19
Auto Restart Mode
In case of Overload or Open Loop, FB exceeds 4.8V which
will be observed by C4. At this time S1 is released that V
SoftS
can increase. If V
SoftS
exceeds 5.4V which is observed by C3,
Auto Restart Mode is entered as both inputs of the gate G5
are high. In combining the FB and SoftS signals, there is a
blanking window generated which prevents the system to
enter Auto Restart Mode due to large load jumps. This time
window is the same as for the Active Burst Mode and can
therefore be adjusted by the external C
SoftS
.
In case of VCC undervoltage, the IC enters into the Auto
Restart Mode and starts a new startup cycle.
Short Optocoupler also leads to VCC undervoltage as there
is no self supply after activating the internal reference and
bias.
In contrast to the Latched Off Mode, there is always a Startup
Phase with switching cycles in Auto Restart Mode. After this
Start Up Phase, the conditions are again checked whether the
failure mode is still present. Normal operation is resumed
once the failure mode is removed that had caused the Auto
Restart Mode.
8.5V
t
I
VCCStart
t
1.05mA
V
OUT
V
VCC
15V
C3
5.4V
C4
4.8V
&
G5
4.4V
S1
1
G2
Control Unit
5k
Auto
Restart
Mode
R
SoftS
6.5V
SoftS
FB
Voltage
Reference
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