ICE2AS01 datasheet(7/24 Pages) INFINEON

部品番号	ICE2AS01

部品情報	PWM-FF IC

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メーカー	INFINEON [Infineon Technologies AG]

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7 / 24 page

Version 2.0

7

1 Feb 2002

ICE2AS01/G

ICE2BS01/G

Functional Description

3

Functional Description

3.1

Power Management

Figure 3

Power Management

The Undervoltage Lockout monitors the external

supply voltage V

VCC. In case the IC is inactive the

current consumption is max. 55µA. When the SMPS is

plugged to the main line the current through R

Start-up

charges the external Capacitor C

VCC.

When V

VCC

exceeds the on-threshold V

CCon=13.5V the internal bias

circuit and the voltage reference are switched on. After

it the internal bandgap generates a reference voltage

V

REF=6.5V to supply the internal circuits. To avoid

uncontrolled ringing at switch-on a hysteresis is

implemented which means that switch-off is only after

active mode when Vcc falls below 8.5V.

In case of switch-on a Power Up Reset is done by

reseting the internal error-latch in the protection unit.

When V

VCC falls below the off-threshold VCCoff=8.5V the

internal reference is switched off and the Power Down

reset let T1 discharging the soft-start capacitor C

Soft-Start

at pin SoftS. Thus it is ensured that at every switch-on

the voltage ramp at pin SoftS starts at zero.

3.2

Improved Current Mode

Figure 4

Current Mode

Current Mode means that the duty cycle is controlled

by the slope of the primary current. This is done by

comparison the FB signal with the amplified current

sense signal.

Figure 5

Pulse Width Modulation

In case the amplified current sense signal exceeds the

FB signal the on-time T

on of the driver is finished by

reseting the PWM-Latch (see Figure 5).

Internal

Bias

V oltage

Refe ren ce

6.5 V

4.8 V

U n de rvolta g e

Lockout

13.5V

8.5V

P o w er-D ow n

Re set

P o w er-U p

Re se t

Pow er M anagem ent

5.3 V

4.0 V

T1

PW M-L atch

R

S

Q

E rror-Latch

S o ftS

6.5V

E rror-D ete ctio n

VC C

M ain Line (100V -380V )

Prim ary W in ding

S o ft-S ta rt C om p ara tor

C

VC C

R

S oft-S ta rt

R

Start-Up

C

S oft-S tart

x3 .6 5

PW M O P

Im proved

C urrent M ode

0.8 V

P W M C om parator

P W M -Latc h

Is ense

FB

R

S

Q

Drive r

S oft-S tart C om parator

t

FB

A m plifie d C urre nt S igna l

T

on

t

0.8V

Drive r

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	ICE2AS01	1Mb / 24P	Off-Line SMPS Current Mode Controller Version 2.1, 30 Jun 2006

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