NCP1217(2004) データシートの表示（PDF） - ON Semiconductor

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NCP1217
(Rev.:2004)

Enhanced PWM Current-Mode Controller for High-Power Universal Off-Line Supplies

ON Semiconductor 

NCP1217, NCP1217A

Soft−Start (NCP1217A only)

The NCP1217A features an internal 1.0 ms soft−start

activated during the power on sequence (PON). As soon as

VCC reaches VCCOFF, the peak current is gradually

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

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 VCC ramps up either from zero (fresh

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.

Figure 30. Soft−start is activated during a startup sequence or an OCP condition

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