ICE1CS02 datasheet(9/27 Pages) INFINEON

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Combi PFC/ PWM Controller

ICE1CS02

Functional Description

Version 1.0

25 July 2008

Functional Description

All values which are used in the functional description

are typical values. For calculating the worst cases the

min/max values which can be found in section 4

Electrical Characteristics have to be considered.

3.1

Introduction

The ICE1CS02 comprises the complete control for

power factor controlled switched mode power sup-

plies. With its PFC and PWM section being internally

synchronized, applies for off-line converters with input

voltages ranging from 90 V to 270 V.

The topology of the PFC preconverter is boost.

The minimal line current gaps for the maximum duty

cycle of the PFC is about 95%. The selectable maxi-

mum duty of the PWM, however, is limited to 47% or

60% to prevent transformer saturation.

The external RC-filter in the feedback line after the

optocoupler is integrated into the IC in order to reduce

the external component count.

The Soft-Start function is integrated into the IC.

An internal precise peak current control is integrated

into the IC. With this function, the costs of the power

transformer and the secondary rectifier diode can be

reduced and the max power can also be limited. The

maximum power is almost independent from the input

voltage. Hence, it can avoid to over-size the critical

components of the SMPS such as the power

transformer or the secondary rectifier diode.

3.2

Power Management

Figure 3

Power Management

The Undervoltage Lockout monitors the external

supply voltage VVCC. When the VVCC exceeds the on-

threshold VCCon=12V, the internal bias circuit is

switched on. A hysteresis sequence is implemented to

avoid the uncontrolled rings during switch-on. The

switch-off of the controller will take place when VVCC

falls below 11V. The maximum current consumption

before the controller is activated is around 1.3mA.

When VVCC falls below the off-threshold; VCCoff=11.0V,

the internal bias circuit is switched off .

3.3

Internal Synchronization

Figure 4

Internal Synchronisation between PFC

and PWM Out

The clock rising edge will trigger a turn-off of PFC OUT

and falling edge will trigger a turn-on of PWM OUT.

Internal Bias

Voltage

Reference

Power Management

VCC

Undervoltage Lockout

12V

11V

Power-Down

Reset

Soft start

CLK OUT

PFC OUT

PWM OUT

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