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參數(shù)資料
| 型號(hào)： | NCP1217P65 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Enhanced PWM Current-Mode Controller for High-Power Universal Off-Line Supplies |
| 中文描述： | 0.5 A SWITCHING CONTROLLER, 71.5 kHz SWITCHING FREQ-MAX, PDIP7 |
| 封裝： | PLASTIC, DIP-8/7 |
| 文件頁(yè)數(shù)： | 11/18頁(yè) |
| 文件大小： | 206K |
| 代理商： | NCP1217P65 |
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NCP1217, NCP1217A
http://onsemi.com
11
Power P1
Power P2
Power P3
Figure 20. Output Pulses at Various Power Levels (X = 5.0 s/div) P1
P2
P3
Figure 21. The Skip Cycle Takes Place at Low Peak Currents which Guarantees NoiseFree 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 dutycycle
greater than 50%. To lower the current loop gain, one usually
injects between 50 and 100% of the inductor downslope.
Figure 22 depicts how internally the ramp is generated.
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