ICE3AS02 Infineon Technologies, ICE3AS02 Datasheet - Page 12

• 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

Current Limiting is now possible in a very accurate way.
E.g. I
Compensation the current sense threshold is set to a static
voltage level V
dI/dt = 0.4A/µs, that means dV
propagation delay time of i.e. t
then to an I
delay compensation the overshoot is only about 2% (see
Figure 13).
Figure 13
The Propagation Delay Compensation is realized by means
of a dynamic threshold voltage V
of a steeper slope the switch off of the driver is earlier to
compensate the delay.
Figure 14
Version 1.2
V
V
OSC
csth
1,25
1,15
1,05
0,95
peak
1,3
1,2
1,1
0,9
V
V
1
Sense
0
= 0.5A with R
peak
0,2
max. Duty Cycle
overshoot of 14.4%. By means of propagation
Overcurrent Shutdown
Dynamic Voltage Threshold V
csth
Signal1
0,4
=1V. A current ramp of
with compensation
0,6
Sense
0,8
= 2. Without Propagation Delay
1
dV
off time
dt
Propagation Delay
Sense
Propagation Delay
csth
Sense
1,2
without compensation
(see Figure 14). In case
/dt = 0.8V/µs, and a
1,4
Signal2
1,6
csth
=180ns leads
1,8
ICE3AS02 / ICE3AS02G / ICE3BS02 / ICE3BS02G
2
t
t
µ
V
s
12
3.6
The Control Unit contains the functions for Active Burst
Mode and Auto Restart Mode. The Active Burst Mode and
the Auto Restart Mode are combined with an Adjustable
Blanking Window which is depending on the external Soft
Start capacitor. By means of this Adjustable Blanking
Window, the IC avoids entering into these two modes
accidentally. Furthermore it also provides a certain time
whereby the overload detection is delayed. This delay is
useful for applications which normally works with a low
current and occasionally require a short duration of high
current.
3.6.1
Figure 15
V
SMPS is settled. If overload occurs V
Auto Restart Mode can’t be entered as the gate G5 is still
blocked by the comparator C3. But after V
4.8V the switch S1 is opened via the gate G2. The external
Soft Start capacitor can now be charged further by the
SoftS
SoftS
FB
5.4V
4.8V
1.32V
is clamped at 4.4V by the closed switch S1 after the
S1
Control Unit
Adjustable Blanking Window
4.4V
5kΩ
Adjustable Blanking Window
C3
C4
C5
R
G2
SoftS
1
Functional Description
6.5V
G5
&
FB
is exceeding 4.8V.
G6
FB
&
02 Sep 2005
Control Unit
Restart
Active
Mode
Mode
has exceeded
Burst
Auto
F3