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參數資料
| 型號： | NCP4326DR2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 模擬信號調理 |
| 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： | 25/30頁 |
| 文件大?。?/td> | 432K |
| 代理商： | NCP4326DR2 |
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NCP4326
http://onsemi.com
25
In a startup sequence, the voltage output is null so the error
amplifier output is at its max value, so the duty cycle from
the PWM_reg signal is at 100% duty cycle. The duty cycle
is only limited by the softstart feature: the switch ON is
done when the Int_Flux voltage is become lower than the
enable pin voltage and the switch OFF is done when the
Int_Flux is become higher than the enable pin voltage.
The following Figure 48 show a real softstart on a typical
application. The limited peak current during the softstart
allows selecting smaller mosfet (for example SOT23
package without risk of exceeding the max non repetitive
peak current “IDM”).
1V8 output voltage
(0.5V/div)
Output peak current
in the power mosfet
(2A/div)
Soft start mode
on 1V8 output
Mixed Mode
Steady state
Normal reg.
Figure 48. Startup Sequence with SoftStart on 1V8 Output at Full Load
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| NCP4326DR2G | 功能描述:初級與次級側 PWM 控制器 Quasi Resonant Secondary Side RoHS:否 制造商:ON Semiconductor 輸出端數量:1 開關頻率: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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