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參數(shù)資料
| 型號： | NCP4326DR2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Secondary Controller for Multi−Output Quasi−Resonant Switchmode Power Supplies |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 19/30頁 |
| 文件大?。?/td> | 432K |
| 代理商： | NCP4326DR2 |
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NCP4326
http://onsemi.com
19
Duty Cycle Control:
Figure 41 shows the duty cycle value according the opamp
output voltage (CPx pin):
1. If the opamp output (V
CPx
) is above the maximum
ramp value (V
Ct_max1
) on “Ct” pin then the duty
cycle will be equal to 100%.
2. If V
CPx
is between the max and the min value of
the ramp voltage, respectively V
Ct_max1
and
V
Ct_min1
then the duty cycle will be included
between 0 and 100%.
3. If V
CPx
is below the min ramp value (V
Ct_min1
)
then the output driver will be place in skip cycle
mode with a null duty cycle.
FB Voltage on pin CPx
Time
Figure 41. Duty Cycle Variation versus the
Feedback Voltage
V
OH1, 2min
Duty Cycle = 100%
0% < Duty Cycle < 100%
Duty Cycle = 0%
V
Ct_max1
V
Ct_min
V
Cpx
Here after find the experimental results illustrating the skip cycle feature:
DRV2 pin Signal
(10 V/div)
Ct ramp pin signal
(1 V/div)
Error amplifier
output voltage (CP2
pin) (1 V/div).
Variable
Duty Cycle
100%
Duty Cycle
0% DC
0% DC
Figure 42. All Duty Cycle Representation
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| NCP4326DR2G | 功能描述:初級與次級側(cè) PWM 控制器 Quasi Resonant Secondary Side RoHS:否 制造商:ON Semiconductor 輸出端數(shù)量:1 開關(guān)頻率:250 KHz 工作電源電壓:- 0.3 V to + 28 V 最大工作溫度:+ 85 C 最小工作溫度:- 5 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Reel |
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