ICE3B1065 Infineon Technologies, ICE3B1065 Datasheet - Page 16

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ICE3B1065

Manufacturer Part Number
ICE3B1065
Description
IC OFFLINE CTRLR SMPS OTP 8DIP
Manufacturer
Infineon Technologies
Series
CoolSET®F3r
Datasheet

Specifications of ICE3B1065

Output Isolation
Isolated
Frequency Range
61 ~ 73kHz
Voltage - Input
8.5 ~ 22 V
Voltage - Output
650V
Power (watts)
32W
Operating Temperature
-40°C ~ 150°C
Package / Case
8-DIP (0.300", 7.62mm)
Number Of Outputs
1
Duty Cycle (max)
77 %
Output Voltage
650 V
Output Current
1000 mA
Mounting Style
Through Hole
Switching Frequency
71 KHz
Maximum Operating Temperature
+ 150 C
Fall Time
30 ns
Minimum Operating Temperature
- 40 C
Rise Time
30 ns
Synchronous Pin
No
Topology
Flyback
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
ICE3B1065X
ICE3B1065XK
SP000015076

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Soft Start capacitor can now be charged further by the
integrated pull up resistor R
the gates G5 and G6 once V
Therefore there is no entering of Auto Restart Mode possible
during this charging time of the external capacitor C
same procedure happens to the external Soft Start capacitor
if a low load condition is detected by comparator C5 when
V
5.4V and V
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
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 18
The Active Burst Mode is located in the Control Unit. Figure
18 shows the related components.
Version 2.0
SoftS
FB
FB
is falling below 1.32V. Only after V
1.32V
5.4V
4.8V
4.0V
3.4V
S1
FB
Active Burst Mode
Active Burst Mode
is still below 1.32V Active Burst Mode is
4.4V
5k
OUT
C6a
C6b
C3
C4
C5
. Active Burst Mode increases
R
SoftS
SoftS
OUT
Control Unit
. The comparator C3 releases
Softs
and fast response on load
6.5V
G6
&
has exceeded 5.4V.
SoftS
G11
Internal Bias
&
has exceeded
Active
Mode
Burst
SoftS
Current
Limiting
G10
&
. The
16
3.6.2.1
The FB signal is always observed by the comparator C5 if
the voltage level falls below 1.32V. In that case the switch S1
is released which allows the capacitor C
starting from the clamped voltage level at 4.4V in normal
operating mode. If V
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
Furthermore gate G11 is then released to start the next burst
cycle once V
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
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
starting level 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 19).
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 blocks C12 by the
VCC
OUT
starts to decrease due to the inactive PWM section.
has to provide the VCC current (see Figure 19).
FB
Entering Active Burst Mode
Working in Active Burst Mode
Leaving Active Burst Mode
has 3.4V exceeded.
SoftS
exceeds 5.4V the comparator C3
Functional Description
OUT
CoolSET™-F3
.
OUT
SoftS
is still below the
24 Aug 2005
to be charged
SoftS
.

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