ICE1CS02G

Manufacturer Part NumberICE1CS02G
DescriptionIC PFC CTRLR AVERAGE CURR DSO16
ManufacturerInfineon Technologies
ICE1CS02G datasheet
 


Specifications of ICE1CS02G

ModeAverage CurrentFrequency - Switching65kHz
Current - Startup1.3mAVoltage - Supply11 V ~ 25 V
Operating Temperature-40°C ~ 150°CMounting TypeSurface Mount
Package / CaseDSO-16Lead Free Status / RoHS StatusLead free / RoHS Compliant
Other namesSP000444092
SP000783614
  
1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Page 10/27

Download datasheet (439Kb)Embed
PrevNext
3.4
PFC Section
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.
3.4.1
Power Supply
An internal under voltage lockout (UVLO) block
monitors the VCC power supply. As soon as it exceeds
12V and the voltage at pin 2 (PFC VSENSE) is >0.6V,
the IC begins operating its gate drive and performs its
Startup as shown in Figure 5.
.
V
> 0.6 V
V
< 0.6 V
VSENSE
VSENSE
V
CC
12 V
IC's
Start
Normal
Open loop/
OFF
Up
State
Operation
Standby
Figure 5
State of Operation respect to VCC
If VCC drops below 11V, the IC is off. The IC will then
be consuming typically 1.3mA. The IC can be turned off
and forced into standby mode by pulling down the
voltage at pin 2 (PFC VSENSE) to lower than 0.6V.
3.4.2
Start-up
Figure 6 shows the operation of voltage loop’s OTA1
during startup. The VCOMP pin is pull internally to
Version 1.0
ground via switch S1 during UVLO and other fault
conditions (see later section on “System Protection”).
During power up when V
rated level, it sources a constant 30µA into the
compensation network at VCOMP pin, causing the
voltage at this pin to rise linearly. This results in a
controlled linear increase of the input current from 0A
thus reducing the stress on the external component.
When V
OUT
VCOMP voltage is level-shifted by the Enhance
Dynamic Response function, to ensure there is no long
period of low or no current.
When V
OUT
sourcing current drops and so does the level shift of the
window detect block. The normal voltage loop then
takes control.
(
R 3 + R 4
R 6
C 4
Figure 6
V
> 0.6 V
VSENSE
3.4.3
The IC provides several protection features in order to
ensure the PFC system in safe operating range.
Depending on the input line voltage (V
11 V
bus voltage (V
when these protections are active.
t
Normal
OFF
Operation
10
Combi PFC/ PWM Controller
ICE1CS02
Functional Description
is less than 83% of the
OUT
is within 83% and 95% of the rated value,
approaches its rated value, OTA1’s
V S E N S E
R 4
x V
)
O U T
O T A 1
V C O M P
p ro te c t
S 1
C 5
Start-up
System Protection
) and output
IN
), Figure 7 and 8 show the conditions
OUT
25 July 2008
3 V