ICE3A1065L Infineon Technologies, ICE3A1065L Datasheet - Page 12

• Manufacturer Part Number: ICE3A1065L
• Description: IC OFFLINE CTRLR SMPS CM 8DIP
• Manufacturer: Infineon Technologies
• Series: CoolSET®F3r

Specifications of ICE3A1065L

• Output Isolation: Isolated
• Frequency Range: 92 ~ 108kHz
• Voltage - Input: 8.5 ~ 22 V
• Voltage - Output: 650V
• Power (watts): 32W
• 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: ICE3A1065LX; ICE3A1065LXK; SP000098668

C
Soft Start capacitor if a low load condition is detected
by comparator C5 when V
Only after V
below 1.30V Active Burst Mode is entered.
3.6.2
The controller provides Active Burst Mode for low load
conditions at V
significantly the efficiency at light load conditions while
supporting a low ripple on V
load jumps. During Active Burst Mode which is
controlled only by the FB signal the IC is always active
and can therefore immediately response on fast
changes at the FB signal. The Startup Cell is kept
switched off to avoid increased power losses for the
self supply.
Figure 15
The Active Burst Mode is located in the Control Unit.
Figure 15 shows the related components.
Version 2.0
SoftS
SoftS
FB
. The same procedure happens to the external
1.30V
4.8V
4.0V
3.4V
5.4V
S1
Active Burst Mode
SoftS
Active Burst Mode
4.4V
5kΩ
OUT
has exceeded 5.4V and V
C6a
C6b
C3
C4
C5
. Active Burst Mode increases
R
SoftS
Control Unit
FB
OUT
6.5V
is falling below 1.30V.
and fast response on
G6
&
Internal Bias
G11
&
Active
Mode
Burst
FB
Limiting
Current
G10
&
is still
12
3.6.2.1
The FB signal is always observed by the comparator
C5 if the voltage level falls below 1.30V. In that case the
switch S1 is released which allows the capacitor C
to be charged starting from the clamped voltage level
at 4.4V in normal operating mode. If V
5.4V the comparator C3 releases the gate G6 to enter
the Active Burst Mode. The time window that is
generated by combining the FB and SoftS signals with
gate G6 avoids a sudden entering of the Active Burst
Mode due to large load jumps. This time window can be
adjusted by the external capacitor C
After entering Active Burst Mode a burst flag is set and
the internal bias is switched off in order to reduce the
current consumption of the IC down to approx. 1.05mA.
In this Off State Phase the IC is no longer self supplied
so that therefore C
(see Figure 16). Furthermore gate G11 is then released
to start the next burst cycle once V
exceeded.
It has to be ensured by the application that the VCC
remains above the Undervoltage Lockout Level of 8.5V
to avoid that the Startup Cell is accidentally switched
on. Otherwise power losses are significantly increased.
The minimum VCC level during Active Burst Mode is
depending on the load conditions and the application.
The lowest VCC level is reached at no load conditions
at V
3.6.2.2
After entering the Active Burst Mode the FB voltage
rises as V
PWM section. Comparator C6a observes the FB signal
if the voltage level 4V is exceeded. In that case the
internal circuit is again activated by the internal Bias to
start with switching. As now in Active Burst Mode the
gate G10 is released the current limit is only 0.257V to
reduce the conduction losses and to avoid audible
noise. If the load at V
for the Active Burst Mode the FB signal decreases
down to 3.4V. At this level C6b deactivates again the
internal circuit by switching off the internal Bias. The
gate G11 is released as after entering Active Burst
Mode the burst flag is set. If working in Active Burst
Mode the FB voltage is changing like a saw tooth
between 3.4V and 4V (see Figure 16).
3.6.2.3
The FB voltage immediately increases if there is a high
load jump. This is observed by comparator C4. As the
current limit is ca. 26% during Active Burst Mode a
certain load jump is needed that FB can exceed 4.8V.
At this time C4 resets the Active Burst Mode which also
OUT
.
OUT
Entering Active Burst Mode
Working in Active Burst Mode
Leaving Active Burst Mode
starts to decrease due to the inactive
VCC
OUT
Functional Description
has to provide the VCC current
is still below the starting level
CoolSET™-F3
SoftS
ICE3xxx65L
.
8 May 2006
FB
SoftS
has 3.4V
exceeds
SoftS