參數(shù)資料
型號(hào)： ICE1PCS01G
廠商： INFINEON TECHNOLOGIES AG
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： Standalone Power Factor Correction (PFC) Controller in Continuous Conduction Mode (CCM)
中文描述： 單機(jī)功率因數(shù)校正（PFC）控制器在連續(xù)導(dǎo)通模式（CCM）
文件頁(yè)數(shù)： 8/18頁(yè)
文件大小： 849K
代理商： ICE1PCS01G
CCM-PFC
ICE1PCS01/G
Functional Description
Preliminary Data
Preliminary Datasheet
8
28 May 2003
3.4
System Protection
The IC provides several protection features in order to
ensure the PFC system in safe operating range.
Depending on the input line voltage (V
IN
) and output
bus voltage (V
), Figure 6 and 7 show the conditions
when these protections are active.
Figure 6
V
IN
Related Protection Features
Figure 7
V
OUT
Related Protection Features
The following sections describe the functionality of
these protection features.
3.4.1
Brown-out occurs when the input voltage V
IN
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
CCUVLO
level yet. For a system without
BOP, 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. The ICE1PCS01/G limits internally the
current drawn from the mains and therefore also limits
the input power. The difference of input and output
power will result in decreasing output voltage. If the
condition prolongs, the decreasing V
OUT
will terminate
in output under voltage condition (OUV, 50% of rated),
and the IC will be shut down (See section 3.4.5).
Figure 8 shows the occurrence of BOP in respect to the
ISENSE voltage.
Brown-Out Protection (BOP)
Figure 8
BOP, SOC and PCL Protection as function
of V
ISENSE
The V
IN
threshold for BOP to occur is dependent on the
voltage at ISENSE and thus the output power. The
rated output power with a minimum V
IN
(V
INMIN
) is
Due to the internal parameter tolerance, the maximum
power with V
INMIN
before BOP occurs is
And the BOP takes over the normal operation under
rated output power latest at an input voltage of
3.4.2
The IC is designed
not
to support any output power
that corresponds to a voltage lower than -0.73V at the
ISENSE pin. A further increase in the inductor current,
which results in a lower ISENSE voltage, will activate
the Soft Over Current Control (SOC). This is a soft
control as it does not directly switch off the gate drive
like the PCL. It acts on the nonlinear gain block to result
in a reduced PWM duty cycle.
Soft Over Current Control (SOC)
3.4.3
The IC provides a cycle by cycle peak current limitation
(PCL). It is active when the voltage at pin 3 (ISENSE)
reaches -1.08V. This voltage is amplified by OP1 by a
factor of -1.43 and connected to comparator C2 with a
reference voltage of 1.5V as shown in Figure 9. A
deglitcher with 300ns after the comparator improves
noise immunity to the activation of this protection.
Peak Current Limit (PCL)
t
V
INMIN
(1)
V
IN
(VAC)
VCC > V
CCUVLO
Normal
Operation
IC OFF
BOP
VCC<V
CCUVLO
(1)
V
INMIN
where BOP activates depends on the output power
IC’s
State
t
V
OUT
PCL / SOC
16%
50%
100%
OLP
OLP
OUV
105%
OVP
V
OUT,Rated
V
ISENSE
-0.6V -0.73V
-1.08V
Normal
Operation
SOC
PCL
P
OUT
(rated)
BOP
IC’s
State
0
(BOP occurs at V
ISENSE
= -0.6V Max)
P
OUT
(max)
P
OUT
rated
(
)
V
INMIN
R1
2
------0.6
×
=
P
OUT
max
(
)
V
INMIN
R1
2
------0.73
×
=
V
BOPMAX
P
OUT
rated
(
)
R1
2
0.73
×
=
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