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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)： | 7/18頁 |
| 文件大小： | 849K |
| 代理商： | ICE1PCS01 |
CCM-PFC
ICE1PCS01/G
Functional Description
3
Preliminary Data
Preliminary Datasheet
7
28 May 2003
3.1
General
The ICE1PCS01/G is a 8 pin control IC for power factor
correction converters. It comes in both DIP and DSO
packages and is suitable for wide range line input
applications from 85 to 265 VAC. The IC supports
converters in boost topology and it operates in
continuous conduction mode (CCM) with average
current control.
The IC operates with a cascaded control; the inner
current loop and the outer voltage loop. The inner
current loop of the IC controls the sinusoidal profile for
the average input current. It uses the dependency of
the PWM duty cycle on the line input voltage to
determine the corresponding input current. This means
the average input current follows the input voltage as
long as the device operates in CCM. Under light load
condition, depending on the choke inductance, the
system may enter into discontinuous conduction mode
(DCM). In DCM, the average current waveform will be
distorted but the resultant harmonics are still low
enough to meet the Class D requirement of IEC 1000-
3-2.
The outer voltage loop controls the output bus voltage.
Depending on the load condition, OTA1 establishes an
appropriate voltage at VCOMP pin which controls the
amplitude of the average input current.
The IC is equipped with various protection features to
ensure safe operating condition for both the system
and device. Important protection features are namely
Brown-out protection, Current Limitation and Output
Under-voltage Protection.
3.2
Power Supply
An internal under voltage lockout (UVLO) block
monitors the VCC power supply. As soon as it exceeds
11.2V and the voltage at pin 6 (VSENSE) is >0.8V, the
IC begins operating its gate drive and performs its Soft-
Start as shown in Figure 3.
.
Figure 3
State of Operation respect to VCC
If VCC drops below 10.2V, the IC is off. The IC will then
be consuming typically 200
μ
A, whereas consuming
18mA during normal operation.
The IC can be turned off and forced into standby mode
by pulling down the voltage at pin 6 (VSENSE) to lower
than 0.8V. The current consumption is reduced to 3mA
in this mode.
3.3
Start-up (Soft-Start)
Figure 4 and 5 show the operation of OTA1 during
startup. It sources a constant 10.8
μ
A into the
compensation network at pin 5 (VCOMP). The voltage
at this pin rises linearly and so does the amplitude of
the input current. As soon as the output voltage V
OUT
reaches 80% of its rated level, the startup procedure is
finished and the normal voltage control takes over. In
normal operation, the IC operates with a higher
maximum current at OTA1 and therefore with a higher
voltage loop gain in order to improve the dynamic
behavior of the device.
.
Figure 4
Soft Start Circuit
Figure 5
Soft Start with controlled current
The advantage of this technique is a soft-start function
with lower stress for the boost diode but without the risk
of audible noise.
V
CC
V
> 0,8 V
V
< 0,8 V
11.2 V
10.5 V
t
OFF
Soft
start
Open loop/
Standby
Normal
Operation
IC's
State
OFF
V
> 0,8 V
Normal
Operation
VCOMP
C5
C4
VSENSE
OTA1
5V
ICE1PCS01/G
C3
Open-Loop
Protect
(OLP)
0.8V
R3 + R4
R4
x V
OUT
)
(
10.8uA during
Soft Start
R6
S1
4.0V
Soft Start
Soft Start
Normal Operation
av(I
IN
)
V
OUT
< 80% rated
V
OUT
> 80% rated
t
Functional Description
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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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| ICE1PCS01GNT | 制造商:Infineon Technologies AG 功能描述:Power Factor Correction CONTRLR 0.1mA 40KHz to 320KHz 8-Pin DSO T/R |
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