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參數(shù)資料
| 型號： | ICE1PCS02G |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Standalone Power Factor Correction (PFC) Controller in Continuous Conduction Mode (CCM) with Input Brown-Out Protection |
| 中文描述： | 單機功率因數(shù)校正在連續(xù)導通模式（CCM）（PFC）控制器具有輸入欠壓保護 |
| 文件頁數(shù)： | 8/18頁 |
| 文件大?。?/td> | 404K |
| 代理商： | ICE1PCS02G |
CCM-PFC
ICE1PCS02/G
Functional Description
Version 1.1
8
28 Dec 2004
.
Figure5
Startup with controlled maximum current
ICE1PCS02/G is different from ICE1PCS01/G in this
block as it does not has a reduced current (~10uA in
ICE1PCS01/G)
during
startup.
ICE1PCS02/G has the same maximum source current
of 30uA (typ) in startup as in the normal operation. This
higher sourcing current in the startup time, will charge
VCOMP faster to its normal operating point, which in
turn results in a faster startup for V
OUT
.
The
OTA1
in
3.4
System Protection
The IC provides several protection features in order to
ensure the PFC system in safe operating range:
VCC Undervoltage Lockout (UVLO)
Input Brown-out Detection (IBOP)
Soft Over Current Control (SOC)
Peak Current Limit (PCL)
Open-Loop Detection (OLP)
Output Over-Voltage Protection (OVP)
After the system is supplied with the correct level of
VCC and V
, the system will enter into its normal mode
of operation. Figure 6 shows situation when these
protections features are active, as a function of the
output voltage V
OUT
.
An activation of the UVLO, IBOP and OLP results in the
internal fault signal going high and brings the IC into the
standby mode.
As the function of UVLO has already described in the
earlier “Power Supply” section, the following sections
continue to describe the functionality of these
protection features.
Figure6
Protection Features
3.4.1
Brown-out occurs when the input voltage V
falls below
the minimum input voltage of the design (i.e. 85V for
universal input voltage range) and the VCC has not
entered into the V
level yet. For a system without
IBOP, the boost converter will increasingly draw a
higher current from the mains at a given output power
which may exceed the maximum design values of the
input current.
ICE1PCS02/G provides a new IBOP feature whereby it
senses directly the input voltage for Input Brown-Out
condition via an external resistor/capacitor/diode
network as shown in Figure 7. This network provides a
filtered value of V
which turns the IC on when the
voltage at pin 4 (VINS) is more than 1.5V. The IC enters
into the standby mode when VINS goes below 0.8V.
The hysteresis prevents the system to oscillate
between normal and standby mode. Note also that V
needs to at least 16% of the rated V
in order to
overcome OLP and powerup the system.
Input Brown-Out Protection (IBOP)
Figure7
Input Brown-Out Protection (IBOP)
av(I
IN
)
V
OUT
t
V
OUT
=rated
95%rated
Window Detect
Normal Control
t
Max Vcomp current
85%rated
VCOMP
Level-shifted VCOMP
t
V
OUT
V
OUT,Rated
PCL / SOC
16%
100%
OLP
OLP
105%
OVP
UVLO / IBOP
Supply
related
Current
related
Output
related
ICE1PCS02/G
85 ... 265 VAC
Vin
C1
D2 ... D5
VINS
C4
C5
R
S
1.5V
0.8V
Brown-Out Detection
R8
R9
C6
D7
brown-out
5V
20k
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