ICE3BR0665JZ Infineon Technologies, ICE3BR0665JZ Datasheet - Page 18

• Manufacturer Part Number: ICE3BR0665JZ
• Description: Off-Line SMPS Current Mode Controller
• Manufacturer: Infineon Technologies

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3.7.3.2
Figure 26
There are 2 modes of V
is during soft start and the other is at all conditions.
The first one is V
and during soft_start period and the IC enters Auto
Restart Mode. The VCC voltage is observed by
comparator C1 and C4. The fault conditions are to
detect the abnormal operating during start up such as
open loop during light load start up, etc. The logic can
eliminate the possible of entering Auto Restart mode if
there is a small voltage overshoots of V
normal operating.
The 2nd one is V
IC enters Auto Restart Mode. This 25.5V Vcc OVP
protection is inactivated during burst mode.
The Thermal Shutdown block monitors the junction
temperature of the IC. After detecting a junction
temperature higher than 130°C, the Auto Restart Mode
is entered.
In case the pre-defined auto-restart features are not
sufficient, there is a customer defined external Auto-
restart Enable feature. This function can be triggered
by pulling down the BA pin to < 0.33V. It can simply add
Version 2.0
Auto-restart
Enable
Signal
T
AE
FB
BA
softs_period
Auto Restart without extended blanking
VCC
0.3V
25.5V
VCC
20.5V
4.0V
Auto Restart mode
time
VCC
VCC
C9
C2
voltage is > 20.5V and FB is > 4.0V
C1
C4
>25.5V and last for 120us and the
CC
Blanking
Blanking
counter
120us
Time
T
1ms
Time
8us
Thermal Shutdown
j
overvoltage protection; one
>140°C
G1
&
Control Unit
UVLO
Stop
drive
gate
Blanking
Spike
30us
V
Auto Restart
Mode Reset
Reference
Auto Restart
VCC
VCC
Voltage
mode
< 10.5V
during
18
a trigger signal to the base of the externally added
transistor, T
enabled, the gate drive switching will be stopped and
then the IC will enter auto-restart mode if the signal
persists. To ensure this auto-restart function will not be
mis-triggered during start up, a 1ms delay time is
implemented to blank the unstable signal.
VCC undervoltage is the Vcc voltage drop below Vcc
turn off threshold. Then the IC will turn off and the start
up cell will turn on automatically. And this leads to Auto
Restart Mode.
Short Optocoupler also leads to VCC undervoltage as
there is no self supply after activating the internal
reference and bias.
AE
at the BA pin. When the function is
Functional Description
ICE3BR0665JZ
12 Nov 2009