ICE3A1065LJ Infineon Technologies, ICE3A1065LJ Datasheet - Page 14

• 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 VCC voltage is observed by comparator C1 while
the FB voltage is monitored by the comparator C4. If
the VCC voltage is > 24V and the FB is > 4.5V, the
overvoltage detection is activated. That means the
overvoltage detection is only activated if the FB signal
is outside the operating range > 4.5V, e.g. when Open
Loop happens. The logic can eliminate the possible of
entering Latch off mode if there is a small voltage
overshoots of V
The internal Voltage Reference is switched off most of
the time once Latched Off Mode is entered in order to
minimize the current consumption of the IC. This
Latched Off Mode can only be reset if the V
In this mode, only the UVLO is working which controls
the Startup Cell by switching on/off at V
During this phase, the average current consumption is
only 250µA. As there is no longer a self-supply by the
auxiliary winding, the VCC drops. The Undervoltage
Lockout switches on the integrated Startup Cell when
VCC falls below 10.5V. The Startup Cell is switched off
again when VCC has exceeded 18V. Once the Latched
Off Mode was entered, there is no Start Up Phase
whenever the VCC exceeds the switch-on level of the
Undervoltage Lockout. Therefore the VCC voltage
changes between the switch-on and switch-off levels of
the Undervoltage Lockout with a saw tooth shape (see
Figure 19).
Figure 19
The Thermal Shutdown block monitors the junction
temperature of the IC. After detecting a junction
temperature higher than latched thermal shutdown
temperature; T
The signals coming from the temperature detection and
VCC overvoltage detection are fed into a spike
blanking with a time constant of 8.0µs in order to
ensure the system reliability.
Version 2.1
0.9mA
10.5V
V
V
18V
I
VCCStart
OUT
VCC
Signals in Latched Off Mode
jSD
VCC
, the Latched Off Mode is entered.
during normal operating.
VCCon
VCC
< 6.23V.
/V
VCCoff
t
t
.
14
Furthermore, a short winding or short diode on the
secondary side can be detected by the comparator C11
which is in parallel to the propagation delay
compensated current limit comparator C10. In normal
operating
maximum level of the CS signal at 1.06V. If there is a
failure such as short winding or short diode, C10 is no
longer able to limit the CS signal at 1.06V. Instead the
comparator C11 detects the peak current voltage >
1.66V and enters the Latched Off Mode immediately in
order to keep the SMPS in a safe stage.
In case the pre-defined Latch Off features are not
sufficient, there is a customer defined external Latch
Enable feature. The Latch Off Mode can be triggered
by pulling down the BL pin to < 0.1V. It can simply add
a trigger signal to the base of the externally added
transistor, T
function will not be mis-triggered during start up, a 1ms
delay time is implemented to blank the unstable signal.
3.6.3.2
Figure 20
In case of Overload or Open Loop, the FB exceeds
4.5V which will be observed by comparator C4. Then
the internal blanking counter starts to count. When it
reaches 20ms, the switch S1 is released. Then the
clamped voltage 0.9V at V
is no external capacitor C
reach 4.0V immediately. When both the input signals at
AND gate G5 is positive, the Auto-Restart Mode will be
activated after the extra spike blanking time of 8.0us is
elapsed. However, when an extra blanking time is
needed, it can be achieved by adding an external
capacitor, C
#
C
BK
FB
BL
4.0V
4.5V
S1
mode,
Auto Restart Mode
BK
LE
Auto Restart Mode
. A constant current source of I
0.9V
at the BL pin. To ensure this latch
C3
C4
I
BK
G2
comparator
1
Functional Description
Blanking
20ms
Time
BL
BK
5.0V
can increase. When there
connected, the V
CoolSET™-F3
ICE3A1065LJ
C10
G5
&
Blanking
Spike
8.0us
Control Unit
controls
29 Jul 2006
BK
Restart
Mode
Auto
will start
BL
the
will