ICE3A1065LJ Infineon Technologies, ICE3A1065LJ Datasheet - Page 12

• Manufacturer Part Number: ICE3A1065LJ
• Description: IC OFFLINE CTRLR SMPS OTP 8DIP
• Manufacturer: Infineon Technologies
• Series: CoolSET®F3r
• Type: Off Line Switcherr

Specifications of ICE3A1065LJ

• Package / Case: 8-DIP (0.300", 7.62mm)
• Output Isolation: Isolated
• Frequency Range: 87 ~ 113kHz
• Voltage - Input: 10.5 ~ 27 V
• Voltage - Output: 650V
• Power (watts): 32W
• Operating Temperature: -40°C ~ 150°C
• Input / Supply Voltage (max): 27 V
• Input / Supply Voltage (min): - 0.3 V
• Duty Cycle (max): 75 %
• Switching Frequency: 100 KHz
• Supply Current: 150 uA
• Operating Temperature Range: - 25 C to + 150 C
• Mounting Style: Through Hole
• Maximum Operating Temperature: + 150 C
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: SP000205733

the 8.0us spike blanking time, the Auto Restart Mode is
activated.
For example, if C
Blanking time = 20ms + C
The 20ms blanking time circuit after C4 is disabled by
the soft stat block such that the controller can start up
properly.
The Active Burst Mode has basic blanking mode only
while the Auto Restart Mode has both the basic and the
extendable blanking mode.
3.6.2
The IC enters Active Burst Mode under low load
conditions. With the Active Burst Mode, the efficiency
increases significantly at light load conditions while still
maintaining a low ripple on V
load jumps. During Active Burst Mode, the IC is
controlled by the FB signal. Since the IC is always
active, it can be a very fast response to the quick
change at the FB signal. The Start up Cell is kept OFF
in order to minimize the power loss.
Figure 16
The Active Burst Mode is located in the Control Unit.
Figure 16 shows the related components.
3.6.2.1
The FB signal is kept monitoring by the comparator C4.
During normal operation, the internal blanking time
counter is reset to 0. When FB signal falls below 1.35V,
Version 2.1
FB
1.35V
3.61V
4.5V
3.0V
Active Burst Mode
Entering Active Burst Mode
Active Burst Mode
BK
C6a
C6b
C4
C5
= 0.22uF, I
20 ms Blanking
Time
BK
Control Unit
OUT
x (4.0 - 0.9) / I
BK
and a fast response on
= 8.4uA
G6
&
Internal Bias
G11
&
BK
Active
Mode
Burst
= 100ms
Limiting
Current
G10
&
12
it starts to count. When the counter reach 20ms and FB
signal is still below 1.35V, the system enters the Active
Burst Mode. This time window prevents a sudden
entering into the Active Burst Mode due to large load
jumps.
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 to approx. 450uA.
It needs the application to enforce the VCC voltage
above the Undervoltage Lockout level of 10.5V such
that the Startup Cell will not be switched on
accidentally. Or otherwise the power loss will increase
drastically. The minimum VCC level during Active Burst
Mode depends on the load condition and the
application. The lowest VCC level is reached at no load
condition.
3.6.2.2
After entering the Active Burst Mode, the FB voltage
rises as V
inactive PWM section. The comparator C6a monitors
the FB signal. If the voltage level is larger than 3.61V,
the internal circuit will be activated; the Internal Bias
circuit resumes and starts to provide switching pulse. In
Active Burst Mode the gate G10 is released and the
current limit is reduced to 0.31V. In one hand, it can
reduce the conduction loss and the other hand, it can
reduce the audible noise. If the load at V
unchanged, the FB signal will drop to 3.0V. At this level
the C6b deactivates the internal circuit again by
switching off the internal Bias. The gate G11 is active
again as the burst flag is set after entering Active Burst
Mode. In Active Burst Mode, the FB voltage is changing
like a saw tooth between 3.0V and 3.61V (see figure
17).
3.6.2.3
The FB voltage will increase immediately if there is a
high load jump. This is observed by the comparator C4.
As the current limit is ca. 31% during Active Burst
Mode, a certain load jump is needed so that the FB
signal can exceed 4.5V. At that time the comparator C4
resets the Active Burst Mode control which in turn
blocks the comparator C12 by the gate G10. The
maximum current can then be resumed to stabilize
V
OUT.
OUT
Working in Active Burst Mode
Leaving Active Burst Mode
starts to decrease, which is due to the
Functional Description
CoolSET™-F3
ICE3A1065LJ
OUT
29 Jul 2006
is still kept