2PCS02 datasheet(8/20 Pages) INFINEON

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CCM-PFC

ICE2PCS02/G

Functional Description

Version 2.4

22 Mar 2010

Figure 5

Startup with controlled maximum current

3.4

System Protection

The IC provides several protection features in order to

ensure the PFC system in safe operating range:

•

VCC Undervoltage Lockout (UVLO)

•

Input Brown-out Detection (IBOP)

•

Soft Over Current Control (SOC)

•

Peak Current Limit (PCL)

•

Open-Loop Detection (OLP)

•

Output Over-Voltage Protection (OVP)

After the system is supplied with the correct level of

VCC and V

IN, the system will enter into its normal mode

of operation. Figure 6 shows situation when these

protections features are active, as a function of the

output voltage V

OUT.

An activation of the UVLO, IBOP and OLP results in the

internal fault signal going high and brings the IC into the

standby mode.

As the function of UVLO has already described in the

earlier “Power Supply” section, the following sections

continue

describe

the

functionality

these

protection features.

Figure 6

Protection Features

3.4.1

Input Brown-Out Protection (IBOP)

Brown-out occurs when the input voltage V

IN falls below

the minimum input voltage of the design (i.e. 85V for

universal input voltage range) and the VCC has not

entered into the V

CCUVLO level yet. For a system without

IBOP, the boost converter will increasingly draw a

higher current from the mains at a given output power

which may exceed the maximum design values of the

input current.

ICE2PCS02/G provides a new IBOP feature whereby it

senses directly the input voltage for Input Brown-Out

condition

via

external

resistor/capacitor/diode

network as shown in Figure 7. This network provides a

filtered value of V

IN which turns the IC on when the

voltage at pin 4 (VINS) is more than 1.5V. The IC enters

into the standby mode when VINS goes below 0.71V.

The hysteresis prevents the system to oscillate

between normal and standby mode. Note also that V

needs to at least 20% of the rated V

OUT in order to

overcome OLP and powerup the system.

Figure 7

Input Brown-Out Protection (IBOP)

av(I

IN)

OUT

OUT =rated

95%rated

Window Detect

Normal Control

Max Vcomp current

83%rated

VCOMP

Level-shifted VCOMP

OUT

PCL / SOC

20%

100%

OLP

108%

OVP

OUT,Rated

UVLO / IBOP

Supply

Current

Output

ICE2PCS02/G

85 ... 265 VAC

Vin

D2 ... D5

VINS

1.5V

0.71V

Brown-Out Detection

brown-out

3.5V

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