ICE3PCS01GXT Infineon Technologies, ICE3PCS01GXT Datasheet - Page 10

• Manufacturer Part Number: ICE3PCS01GXT
• Manufacturer: Infineon Technologies

Specifications of ICE3PCS01GXT

• Lead Free Status / Rohs Status: Compliant

3
3.1
The ICE3PCS01G is a 14-pins control IC for power
factor correction converters. It is suitable for wide range
line input applications from 85 to 265 VAC with overall
efficiency above 90%. 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) resulting in a higher harmonics but still meeting
the Class D requirement of IEC 1000-3-2.
The outer voltage loop controls the output bulk voltage,
integrated digitally within the IC. Depending on the load
condition, internal PI compensation output is converted
to an appropriate DC voltage 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.
3.2
An internal under voltage lockout (UVLO) block
monitors the VCC power supply. As soon as it exceeds
12.0V and both voltages at pin 11 (VSENSE) >0.5V
and pin 9 (BOP) >1.25V, the IC begins operating its
gate drive and performs its startup as shown in Figure
3.
If VCC drops below 11V, the IC is off. The IC will then
be consuming typically 1.4mA, whereas consuming
6.7mA during normal operation
The IC can be turned off and forced into standby mode
by pulling down the voltage at pin 11 (VSENSE) below
0.5V or the voltage at pin 7 (VBTHL_EN) below 0.5V.
Version 2.0
General
Power Supply
Functional
Description
10
Figure 3
3.3
During power up when the Vout is less than 95% of the
rated level, internal voltage loop output increases from
initial voltage under the soft-start control. This results in
a controlled linear increase of the input current from 0A
thus reducing the stress in the external components.
Once Vout has reached 95% of the rated level, the soft-
start control is released to achieve good regulation and
dynamic response and VB_OK pin outputs 5V
indicating PFC stage in normal operation.
3.4
The IC can provide external switching frequency
setting by an external resistor R
synchronization by external pulse signal at FREQ pin.
3.4.1
The switching frequency of the PFC converter can be
set with an external resistor R
shown Figure 2. The pin voltage at V
The corresponding capacitor for the oscillator is
integrated in the device and the R
given in Figure 4. The recommended operating
frequency range is from 21kHz to 250kHz. As an
example, a R
switching frequency F
100%
95%
20%
26V
12V
5V
5V
VB_OK
V
V
I
V
VCC
BULK
REF
CC
UVLO
1.4 mA
configuration
within 50us
OVP
Start-up
Frequency Setting and External
Synchronization
Frequency Setting
VREF rises to 5V with
5 mA
100nF external cap.
State of Operation respect to VCC
within 200us
FREQ
of 67kΩ at pin FREQ will set a
Bulk voltage rises to 95% rated value
SW
Functional Description
with 1nF external cap. at gate drive pin
of 65kHz typically.
within 200ms
<6.7mA
FREQ
FREQ
ICE3PCS01G
operation
FREQ
FREQ
Normal
at FREQ pin as
and the online
CCM-PFC
/frequency is
5 May 2010
is typical 1V.
(V
VSENSE
3.5mA
< 0.5V or V
Standby mode
VBTHL
< 0.5V)