参数资料
| 型号： | NCP4326DR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 27/29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
Secondary winding
voltage (20V/div)
Sync pin voltage
(5V/div).
Ct pin voltage
(2V/div)
Figure 51. Soft ? Start Duty Cycle Generation During the Startup Sequence.
During the primary on time, the secondary winding
voltage is equal to the input voltage multiplied by the
transformer turn ratio. At the primary switch on or the falling
edge on the secondary winding voltage, the Ct capacitor
voltage is reset to VCt_min and keeps it to this value as long
as the primary switch is in ON state. Then when the primary
ON time ends the Ct capacitor voltage is released, thus with
Primary Feedback Regulation
The NCP4326 integrates a precision reference voltage,
which together with a dedicated operational amplifier
reduces the feedback loop elements to the minimum. This
error operational amplifier with the reference voltage has
called the shunt regulator and offers the same behavior of a
traditional TL431 or TLV431.
the internal current source on Ct pin, the voltage capacitor
rises linearly until a new primary switching cycle.
8
9
FBm
NCP4326
V DD1
?
CPm
8
9
FBm
TLV431
CPm
1V25
+
GND
GND
Figure 52. Equivalent Schematic of the Shunt Regulator
http://onsemi.com
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