ICE2QR2280ZXKLA1 Infineon, ICE2QR2280ZXKLA1 Datasheet - Page 11

• Manufacturer Part Number: ICE2QR2280ZXKLA1
• Description: Power Supplies, Regulators and Accessories, Power Products
• Manufacturer: Infineon

immediately after leaving Active Burst Mode. This is
helpful to decrease the output voltage undershoot.
Figure 8
3.6
The IC provides full protection functions. The following
table summarizes these protection functions.
Table 2
During operation, the VCC voltage is continuously
monitored. In case of an under- or an over-voltage, the
Version 2.1
V
V
VCC Overvoltage
VCC Undervoltage
Overload/Open Loop
Over temperature
Output Overvoltage
Short Winding
V
V
V
V
V
1.0V
V
FBBOn
FBBOff
V
V
VCCoff
FB
CSB
FBLB
FBEB
O
CS
VCC
Current limit level
during Active Burst
Mode
Protection Functions
blanking Window (t
time to 7
Protection features
Signals in Active Burst Mode
Max. Ripple < 1%
Entering
Active Burst
Mode
th
zero and
BEB
)
Auto Restart Mode
Auto Restart Mode
Auto Restart Mode
Auto Restart Mode
Latched Off Mode
Latched Off Mode
Leaving
Active Burst
Mode
t
t
t
t
11
IC is reset and the main power switch is then kept off.
After the VCC voltage falls below the threshold V
the startup cell is activated. The VCC capacitor is then
charged up. Once the voltage exceeds the threshold
V
In case of open control loop or output over load, the
feedback voltage will be pulled up. After a blanking time
of 24ms, the IC enters auto-restart mode. The blanking
time here enables the converter to provide a max.
power in case the increase in V
load increase. During off-time of the power switch, the
voltage at the zero-crossing pin is monitored for output
over-voltage detection. If the voltage is higher than the
preset threshold v
preset blanking time. This latch off mode can only be
reset if the Vcc <6.23V.
If the junction temperature of IC exceeds 140 °C, the IC
enters into autorestart mode (OTP).
If the voltage at the current sensing pin is higher than
the preset threshold v
switch, the IC is latched off. This is short-winding
protection.
During latch-off protection mode, the VCC voltage
drops to 10.5V and then the startup cell is activated.
The VCC voltage is then charged to 18V. The startup
cell is shut down again. This action repeats again and
again.
There is also a maximum on time limitation
implemented inside the ICE2QR2280Z. Once the gate
voltage is high and longer than t
turned off immediately.
VCCon
, the IC begins to operate with a new soft-start.
ZCOVP
CSSW
Functional Description
, the IC is latched off after the
during on-time of the power
CoolSET
FB
ICE2QR2280Z
OnMAx
is due to a sudden
August 30, 2011
, the switch is
®
- Q1
VCCoff
,