NCP1217AD133R2G datasheet(11/18 Pages) ONSEMI

Part #	NCP1217AD133R2G

Description	Enhanced PWM Current?묺ode Controller for High?뭁ower Universal Off?묹ine Supplies

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1217, NCP1217A

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Power P1

Power P2

Power P3

Figure 20. Output Pulses at Various Power Levels (X = 5.0

ms/div) P1 t P2 t P3

Figure 21. The Skip Cycle Takes Place at Low Peak Currents which Guarantees Noise−Free Operation

315.40 U

882.70 U

1.450 M

2.017 M

2.585 M

300 M

200 M

100 M

0

MAX PEAK

CURRENT

SKIP CYCLE

CURRENT LIMIT

Sufficient margin shall be kept between normal Pin1 level and the latchoff point in order to avoid false triggering.

Ramp Compensation

Ramp compensation is a known mean to cure

subharmonic oscillations. These oscillations take place at

half the switching frequency and occur only during

Continuous Conduction Mode (CCM) with a duty−cycle

greater than 50%. To lower the current loop gain, one usually

injects between 50 and 100% of the inductor down−slope.

Figure 22 depicts how internally the ramp is generated.

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