ICE3AS02 Infineon Technologies, ICE3AS02 Datasheet - Page 9

• Manufacturer Part Number: ICE3AS02
• Description: IC OFFLINE CTRLR SMPS CM 8DIP
• Manufacturer: Infineon Technologies
• Series: CoolSET®F3r

Specifications of ICE3AS02

• Output Isolation: Isolated
• Frequency Range: 92 ~ 108kHz
• Voltage - Input: 8.5 ~ 22 V
• Voltage - Output: 500V
• Power (watts): 900mW
• Operating Temperature: -25°C ~ 130°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ICE3AS02X; ICE3AS02XK; SP000015084

When Active Burst Mode is entered, the internal Bias is
switched off in order to reduce the current consumption to
below 1.05mA while keeping the Voltage Reference active
as this is necessary in this mode.
3.3
Figure 5
At the beginning of the Startup Phase, the IC provides a Soft
Start duration whereby it controls the maximum primary
current by means of a duty cycle limitation. A signal V
which is generated by the external capacitor C
combination with the internal pull up resistor R
determines the duty cycle until V
When the Soft Start begins, C
to approx. 1V by T2. Therefore the Soft Start Phase takes
place between 1V and 4V. Above V
longer duty cycle limitation DC
comparator C7 since comparator C2 blocks the gate G7 (see
Figure 5). This maximum charge current in the very first
stage when V
Version 1.2
SoftS
C
SoftS
Startup Phase
SoftS
4V
0.85V
Soft Start
is below 1V, is limited to 1.32mA.
Soft Start
R
SoftS
3.25kΩ
C7
C2
PWM OP
T2
SoftS
Comparator
Soft-Start
max
SoftS
is immediately charged up
x3.7
which is controlled by
G7
exceeds 4V.
SoftsS
&
T3
= 4V there is no
Gate Driver
ICE3AS02 / ICE3AS02G / ICE3BS02 / ICE3BS02G
1V
6.5V
Softs
CS
SoftS
SoftS
in
,
9
Figure 6
By means of this extra charge stage, there is no delay in the
beginning of the Startup Phase when there is still no
switching. Furthermore Soft Start is finished at 4V to have
faster the maximum power capability. The duty cycles DC
and DC
inductance of the transformer. The limitation of the primary
current by DC
to a maximum primary current which is limited by the
internal Current Limiting with CS = 1V. Therefore the
maximum Startup Phase is divided into a Soft Start Phase
until t1 and a phase from t1 until t2 where maximum power
is provided if demanded by the FB signal.
DC
5.4V
4V
1V
V
DC
DC
SoftS
max
1
2
2
max. Soft Start Phase
are depending on the mains and the primary
2
Startup Phase
is related to V
max. Startup Phase
Functional Description
t1
SoftS
= 4V. But DC
02 Sep 2005
1
is related
t2
F3
t
t
1