ICE1PCS01G Infineon Technologies, ICE1PCS01G Datasheet - Page 7

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ICE1PCS01G

Manufacturer Part Number
ICE1PCS01G
Description
IC PFC CONTROLLER CCM DSO8
Manufacturer
Infineon Technologies
Datasheet

Specifications of ICE1PCS01G

Mode
Continuous Conduction (CCM)
Frequency - Switching
133kHz
Current - Startup
100µA
Voltage - Supply
10.2 V ~ 21 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
DSO-8
Switching Frequency
40 KHz to 320 KHz
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
ICE1PCS01GNT
ICE1PCS01GXT
SP000081001

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3
3.1
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
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
Version 1.2
IC's
State
V
CC
11.2 V
OFF
General
Power Supply
State of Operation respect to VCC
Soft
start
Functional Description
V
> 0,8 V
VSENSE
Operation
Normal
Open loop/
V
< 0,8 V
Standby
VSENSE
Operation
Normal
V
> 0,8 V
VSENSE
10.5 V
OFF
t
7
If VCC drops below 10.2V, the IC is off. The IC will then
be consuming typically 200µA, 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
Figure 4 and 5 show the operation of OTA1 during
startup. It sources a constant 10.8µA 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
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
Figure 5
The advantage of this technique is a soft-start function
with lower stress for the boost diode but without the risk
of audible noise.
(
C4
R6
av(I
R3 + R4
Start-up (Soft-Start)
R4
VSENSE
IN
VCOMP
Soft Start Circuit
Soft Start with controlled current
10.8uA during
Soft Start
)
V
Soft Start
x V
OUT
C5
OUT
< 80% rated
)
Functional Description
ICE1PCS01/G
S1
Soft Start
OTA1
Normal Operation
ICE1PCS01/G
V
Open-Loop
OUT
Protect
(OLP)
5V
4.0V
> 80% rated
CCM-PFC
06 Feb 2007
C3
0.8V
t
OUT

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