ICE1QS01 Datasheet, PDF (9/21 Pages) Infineon Technologies AG – Controller for Switch Mode Power Supplies Supporting Low Power Standby and Power Factor Correction (PFC)

ICE1QS01
Ringing suppression
When V_PCS reaches the feedback voltage V_SRC the gate drive OUT is set to low and the ringing
suppression timer is started. This timer ensures that the gate drive cannot be switched on until this
ringing suppression time is passed. Duration of ringing suppression time depends on the V_RZI volt-
age. Suppression time is 3 µsec if V_RZI > 1V and it is 30 µsec if V_RZI < 1V.
Figure: Ringing Suppression
VRZI
1V
up-down-counter
=1
up-down-counter
=1
VSRC
VPCS
1.5V
OUT
ringing
suppression
time
Version 1.4
3 µs
9
30 us
27 Apr 2004