NCP1336 ONSEMI [ON Semiconductor], NCP1336 Datasheet - Page 16

• Manufacturer Part Number: NCP1336
• Description: Quasi-Resonant Current Mode Controller for High Power Universal Off-Line Supplies
• Manufacturer: ONSEMI [ON Semiconductor]

Time Out
comparator can be unable to detect the valleys.
Consequently, the decimal counter clock is in low state and
the drive pulses stops. To avoid such situation, NCP1336
In case of extremely damped free oscillations, the ZCD
Laux
ZCD
10 V
ESD
DRV
+
Vth
3 ms Pulse
+
-
Leakage
Blanking
Figure 14. Time Out Circuit
100 ns
http://onsemi.com
16
integrates a Time Out function that acts as a clock for the
decimal counter. The controller thus continues its normal
operation. To avoid having a too big step in frequency, the
time out duration is set to 5.25 ms. Figures 15 and 16 detail
the time out operation.
Vdd
+
demag
Timeout
5 ms
+
-
Decimal Counter
1
2
clk
3
4
rst