NCP1217D133R2 ON Semiconductor, NCP1217D133R2 Datasheet - Page 11

• Manufacturer Part Number: NCP1217D133R2
• Description: IC CTRLR PWM CM OVP HV 8SOIC
• Manufacturer: ON Semiconductor
• Type: PWM Current-Mode Controller For High-Power Universal Off-Line Suppliesr

Specifications of NCP1217D133R2

• Output Isolation: Isolated
• Frequency Range: 120 ~ 146kHz
• Voltage - Input: 10 ~ 16 V
• Operating Temperature: 0°C ~ 150°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Input Voltage Range: 16 V
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: NCP1217D133R2OS

Ramp Compensation
subharmonic oscillations. These oscillations take place at
half the switching frequency and occur only during
Sufficient margin shall be kept between normal Pin1 level and the latchoff point in order to avoid false triggering.
Ramp compensation is a known mean to cure
Figure 21. The Skip Cycle Takes Place at Low Peak Currents which Guarantees Noise- -Free Operation
Figure 20. Output Pulses at Various Power Levels (X = 5.0 ms/div) P1 < P2 < P3
300 M
200 M
100 M
0
315.40 U
882.70 U
MAX PEAK
CURRENT
http://onsemi.com
1.450 M
11
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.
2.017 M
CURRENT LIMIT
SKIP CYCLE
2.585 M
Power P1
Power P2
Power P3