ICE3B1565J Infineon Technologies, ICE3B1565J Datasheet - Page 12

• Manufacturer Part Number: ICE3B1565J
• Description: IC OFFLINE CTRLR SMPS OTP 8DIP
• Manufacturer: Infineon Technologies
• Series: CoolSET®F3r

Specifications of ICE3B1565J

• Output Isolation: Isolated
• Frequency Range: 58 ~ 76kHz
• Voltage - Input: 10.3 ~ 27 V
• Voltage - Output: 650V
• Power (watts): 42W
• Operating Temperature: -25°C ~ 130°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Number Of Outputs: 1
• Duty Cycle (max): 80 %
• Output Voltage: 650 V
• Output Current: 1500 mA
• Mounting Style: Through Hole
• Switching Frequency: 74.5 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: ICE3B1565JX; ICE3B1565JXK; SP000098876

exceeded 4.5V the switch S2 is opened and S3 is
closed. The external Soft Start capacitor can now be
charged further by the integrated pull up resistor R
via switch S3. The comparator C3 releases the gates
G5 and G6 once V
there is no entering of Auto Restart Mode possible
during this charging time of the external capacitor
C
Soft Start capacitor if a low load condition is detected
by comparator C5 when V
Only after V
below 1.35V 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 14
Version 2.4
SoftS
SoftS
FB
. The same procedure happens to the external
1.35V
3.61V
4.5V
3.0V
4.0V
S1
Active Burst Mode
SoftS
Active Burst Mode
3.0V
OUT
has exceeded 4.0V and V
C6a
C6b
C3
C4
C5
Softs
. Active Burst Mode increases
has exceeded 4.0V. Therefore
S3
S2
Control Unit
FB
OUT
is falling below 1.35V.
and fast response on
Frequency
G6
&
Jitter
R
Internal Bias
SoftS
G11
&
Active
Mode
Burst
FB
Limiting
Current
G10
&
5V
is still
SoftS
12
The Active Burst Mode is located in the Control Unit.
Figure 14 shows the related components.
3.6.2.1
The FB signal is always observed by the comparator
C5 if the voltage level falls below 1.35V. In that case the
switch S1 and S2 is released which allows the
capacitor C
swinging voltage level between 3.2V and 3.6V in
normal operating mode. If V
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. 500uA.
Also, switch S1 is closed to clamped the Soft Start
voltage to 3.0V. In this Off State Phase the IC is no
longer self supplied so that therefore C
provide the VCC current (see Figure 15). 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
10.3V 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 3.61V 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 0.32V 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 3.0V. 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 3.0V and 3.61V (see figure 15).
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. 32% during Active Burst Mode a
certain load jump is needed that FB can exceed 4.5V.
At this time C4 resets the Active Burst Mode which also
FB
has 3.0V exceeded.
OUT
SoftS
Entering Active Burst Mode
Working in Active Burst Mode
Leaving Active Burst Mode
OUT
starts to decrease due to the inactive
to be charged via S3 starting from the
.
OUT
is still below the starting level
SoftS
SoftS
.
CoolSET™-F3
exceeds 4.0V the
ICE3Bxx65J
14 Nov 2006
VCC
has to