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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)： | 17/30頁 |
| 文件大?。?/td> | 432K |
| 代理商： | NCP4326DR2 |
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NCP4326
http://onsemi.com
17
APPLICATION INFORMATION
Introduction
The NCP4326 is designed to regulate voltages in multiple
output power supplies running in borderline or critical
conduction mode. It controls two independent switches to
precisely adjust two separate secondary outputs.
A precision reference voltage is integrated together with
a dedicated operational amplifier to reduce the feedback
loop elements to the minimum. A skip cycle feature
improves the standby power in light load condition. A
dedicated shutdown pin offers an easy mean to disable the
secondary outputs.
Regulation Principle
The NCP4326 can handle up to three independent outputs:
it provides the feedback for the main output, and can also
regulates two others secondary outputs.
The secondary outputs behave as a buck converter:
The voltage is supplied via a secondary winding
voltage
The switch, inserted in series with the flyback diode, is
controlled by the NCP4326.
Q1 On time:
Q2 is switched ON but no current flows through Q2
due to diode D2 polarized in reverse.
Q1 Off time:
Q2 is still ON and the energy is delivered to the load.
Q2 MOSFET is kept ON till the secondary output
reaches the set point.
Mosfet Q2 is switch OFF until a new cycle begins.
Figure 39 illustrates the regulation principle with only one
secondary output regulated by the NCP4326, but it can
regulate independently another one output, that is to say 3
independent outputs.
Figure 39. Regulation Principle Schematic
D1
L1
Vout_min
GND
D2
Q2
C1
C3
Vout1
Sync
C2
GND
L2
C6
+
+
+
+
Q1
Secondary
Regulation
Primary
Feedback
QR
Primary
Controller
Opto
Coupler
Secondary Controller
Vin
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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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| NCP432B | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Programmable Precision References |
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