NCP1217 ONSEMI [ON Semiconductor], NCP1217 Datasheet - Page 15

• Manufacturer Part Number: NCP1217
• Description: Enhanced PWM Current−Mode Controller for High−Power Universal Off−Line Supplies
• Manufacturer: ONSEMI [ON Semiconductor]

Soft−Start (NCP1217A only)
activated during the power on sequence (PON). As soon as
V
increased from nearly zero up to the maximum clamping
level (e.g. 1.0 V). This situation lasts during 1.0 ms and
further to that time period, the peak current limit is blocked
to 1.0 V until the supply enters regulation. The soft−start is
CC
The NCP1217A features an internal 1.0 ms soft−start
reaches VCC
Figure 30. Soft−start is activated during a startup sequence or an OCP condition
OFF
, the peak current is gradually
NCP1217, NCP1217A
http://onsemi.com
15
also activated during the Over Current Burst (OCP)
sequence. Every restart attempt is followed by a soft−start
activation. Generally speaking, the soft−start will be
activated when V
power−on sequence) or 5.6 V, the latchoff voltage occurring
during OCP. Figure 30 portrays the soft−start behavior. The
time scales are purposely shifted to offer a better zoom
portion.
CC
ramps up either from zero (fresh