ICE2QR0665_10 INFINEON [Infineon Technologies AG], ICE2QR0665_10 Datasheet - Page 11

• Manufacturer Part Number: ICE2QR0665_10
• Description: Off-Line SMPS Quasi-Resonant PWM Controller
• Manufacturer: INFINEON [Infineon Technologies AG]

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 2.3
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
Protection features
Signals in Active Burst Mode
Max. Ripple < 1%
Entering
Active Burst
Mode
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
high power in case the increase in V
sudden 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
IC is latched off after the preset blanking time.
If the junction temperature of IC exceeds 140 C, the IC
enter into autorestart mode.
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, when the VCC
voltage drops to 10.5V,the startup cell is activated and
the VCC voltage is charged to 18V then the startup cell
is shut down again and repeats the previous procedure.
There is also an maximum on time limitation inside
ICE2QR0665. Once the gate voltage is high longer
than t
VCCon
OnMAx
, the IC begins to operate with a new soft-start.
, it is turned off immediately.
CSSW
Functional Description
during on-time of the power
CoolSET
ICE2QR0665
April 27, 2010
FB
is due to a
ZCOVP
®
- Q1
VCCoff
, the
,