参数资料
| 型号： | NCP4326DR2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 17/29页 |
| 文件大小： | 0K |
| 描述： | IC SECONDARY CTLR SW PS 16-SOIC |
| 产品变化通告： | Discontinuation 30/Jun/2006 |
| 标准包装： | 2,500 |
| 应用： | 次级控制器，准谐振切换模式电源 |
| 输入电压： | 15V |
| 输出数： | 3 |
| 工作温度： | 0°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
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NCP4326
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.
D1
Sync
+
C1
L1
+
C2
Vout_min
Vin
GND
D2
Q2
+
C3
L2
+
C6
Vout1
GND
QR
Primary
Controller
Q1
Secondary
Regulation
Primary
Opto
Feedback
Coupler
Secondary Controller
Figure 39. Regulation Principle Schematic
http://onsemi.com
17
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