ICE3AR1580VJZ Datasheet, PDF (26/43 Pages) Infineon Technologies AG – Of f -Line SMPS Cur rent Mode Cont rol ler wi th integrated 800V

CoolSET™ F3R80
ICE3AR1580VJZ
Functional Description
Vcc OVP (2) condition is when VVCC voltage is > 25.5V, the IC enters into odd skip Auto Restart Mode (Figure
30).
The over temperature protection OTP is sensed inside the controller IC. The Thermal Shutdown block keeps on
monitoring the junction temperature of the controller. After detecting a junction temperature higher than 130°C, the
IC will enter into the non switch Auto Restart mode. The ICE3AR1580VJZ has also implemented with a 50^°C
hysteresis. That means the IC can only be recovered when the controller junction temperature is dropped 50^°C
lower than the over temperature trigger point (Figure 30).
The VCC undervoltage and short opto-coupler will go into the normal auto restart mode inherently.
In case of VCC undervoltage, the Vcc voltage drops indefinitely. When it drops below the Vcc under voltage lock out
“OFF” voltage (10.5V), the IC will turn off the IC and the startup cell will turn on again. Then the Vcc voltage will be
charged up to UVLO “ON” voltage (17V) and the IC turns on again provided the startup cell charge up current is not
drained by the fault. If the fault is not removed, the Vcc will continue to drop until it hits UVLO “OFF” voltage and the
restart cycle repeats.
Short Optocoupler can lead to Vcc undervoltage because once the opto-coupler (transistor side) is shorted, the
feedback voltage will drop to zero and there will be no switching pulse. Then the Vcc voltage will drop same as
the Vcc undervoltage.
3.7.3.2 Over load, open loop protection
5.0V
Voltage
Reference
Ichg_EB
S1
R_OV2 ^CBK BV
#
4.5V
C11
500
C3
0.9V
S2
Auto Restart
Mode Reset
VVCC < 10.5V
counter
CT1
Auto
Restart
Mode
Spike
Blanking
30us
&
G5
FBB
C4
4.5V
20ms
Blanking
Time
Control Unit
Figure 31: Over load, open loop protection
In case of Overload or Open Loop, the FBB exceeds 4.5V which will be observed by comparator C4. Then the built-
in blanking time counter starts to count. When it reaches 20ms, the extended blanking time counter CT1 is
activated. The switch S2 is turned on and the voltage at the BV pin will be discharged through 500Ω resistor. When
it drops to 0.9V, the switch S2 is turned off and the Switch S1 is turned on. Then a constant current source I_{chg_EB}
will start to charge up BV pin. When the voltage hits 4.5V which is monitored by comparator C11, the switch S1 is
turned off and the count will increase by 1. Then the switch S2 will turn on again and the voltage will drop to 0.9V
and rise to 4.5V again. The count will then increase by 1 again. When the total count reaches 256, the counter
CT1 will stop and it will release a high output signal. When both the input signals at AND gate G5 is high, the
odd skip Auto Restart Mode is activated after the 30µs spike blanking time (Figure 31).
The total blanking time depends on the addition of the built-in and the extended blanking time. If there is no CBK
capacitor at BV pin, the count will finish within 0.1ms and the equivalent blanking time is just the built-in time of
20ms.
Since the BV pin is a multi-function pin, it would share with different functions. The resistor R_OV2 from input OVP
feature application may however affect the extendable blanking time (Figure 31). Thus it should take the ROV2
into the calculation of the extendable blanking time. For example the extended blanking time may be changed
from 181ms to 212ms for 42.2KΩ to 15KΩ R_OV2 resistor. The list below shows one particular C_BK, R_OV2 vs
blanking time.
Data Sheet
26
V2.0, 2014-01-20