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參數(shù)資料
| 型號： | ICE1PCS01 |
| 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） |
| 文件頁數(shù)： | 9/18頁 |
| 文件大小： | 849K |
| 代理商： | ICE1PCS01 |
CCM-PFC
ICE1PCS01/G
Functional Description
Preliminary Data
Preliminary Datasheet
9
28 May 2003
Figure 9
Peak Current Limit (PCL)
3.4.4
Open Loop Protection / Input Under
Voltage Protect (OLP)
Whenever VSENSE voltage falls below 0.8V, or
equivalently V
OUT
falls below 16% of its rated value, it
indicates an open loop condition (i.e. VSENSE pin not
connected) or an insufficient input voltage V
IN
for
normal operation. In this case, most of the blocks within
the IC will be shutdown. It is implemented using
comparator C3 with a threshold of 0.8V as shown in the
IC block diagram in Figure 2.
3.4.5
In the event of main interrupt or brown-out condition,
the PFC system is not able to deliver the rated output
power. This will cause the output voltage V
OUT
to drop
below its rated value. The IC provides an output under
voltage detection that checks if V
OUT
is falling below
50% of its rated value. Comparator C4 as shown in the
device block diagram (Figure 2) senses the voltage at
pin 6 (VSENSE) with a reference of 2.5V. If comparator
C4 trips, the IC will be shut down as in OLP. The IC will
be ready to restart if there is sufficient V
IN
to pull V
OUT
out of OLP.
Output Under Voltage Detection (OUV)
3.4.6
Whenever V
OUT
exceeds the rated value by 5%, the
over-voltage protection OVP is active as shown in
Figure 7. This is implemented by sensing the voltage at
pin VSENSE with respect to a reference voltage of
5.25V. A VSENSE voltage higher than 5.25V will
immediately reduce the output duty cycle, bypassing
the normal voltage loop control. This results in a lower
input power to reduce the output voltage V
OUT
.
Over-Voltage Protection (OVP)
3.5
Frequency Setting
The switching frequency of the PFC converter can be
set with an external resistor R5 at FREQ pin. The pin
voltage V
FREQ
is typically 2.5V. The corresponding
capacitor for the oscillator is integrated in the device
and the R5/frequency relationship is given at the
“
Electrical
recommended operating frequency range is from
50kHz to 250kHz. As an example, a R5 of 33k
at pin
FREQ will set a switching frequency F
SW
of 133kHz
typically.
Characteristic
”
section.
The
3.6
Average Current Control
3.6.1
The complete system current loop is shown in Figure
10.
Complete Current Loop
Figure 10
Complete System Current Loop
It consists of the current loop block which averages the
voltage at pin ISENSE, resulted from the inductor
current flowing across R1. The averaged waveform is
compared with an internal ramp in the ramp generator
and PWM block. Once the ramp crosses the average
waveform, the comparator C1 turns on the driver stage
through the PWM logic block. The Nonlinear Gain block
defines the amplitude of the inductor current. The
following sections describe the functionality of each
individual blocks.
3.6.2
The compensation of the current loop is done at the
ICOMP pin. This is the OTA2 output and a capacitor C3
has to be installed at this node to ground (see Figure
10). Under normal mode of operation, this pin gives a
voltage which is proportional to the averaged inductor
current. This pin is internally shorted to 5V in the event
of IC shuts down when OLP and UVLO occur.
Current Loop Compensation
3.6.3
The IC employs an average current control scheme in
continuous conduction mode (CCM) to achieve the
power factor correction.
Pulse Width Modulation (PWM)
ISENSE
ICE1PCS01/G
R1
R2
I
INDUCTOR
OP1
1.43x
Current Limit
300ns
C2
Deglitcher
Turn Off
Driver
1.5V
Full-wave
Rectifier
R
S
ICE1PCS01/G
Vout
L1
C2
R3
R4
Gate
Driver
D1
From
Full-wave
Retifier
GATE
R1
R2
OTA2
ICOMP
4V
Current Loop
Compensation
Current Loop
Nonlinear
Gain
1.1mS
+/-50uA (linear range)
C3
S2
Fault
ISENSE
C1
PWM
Comparator
PWM Logic
Q
Input From
Voltage Loop
voltage
proportional to
averaged
Inductor current
R7
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| ICE1PCS01_07 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Standalone Power Factor Correction (PFC) Controller in Continuous Conduction Mode (CCM) |
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