参数资料
| 型号： | NCP4326DR2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 22/29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
How Does the Enable Pin Work?
The enable pin cumulates two functions; it
enables/disables the driver and it generates the soft ? start
time in leading edge mode control in order to control the
ramp up peak current during a startup sequence.
According the enable pin voltage level (V ENX ) there are
three modes:
1. DISABLE MODE: when V ENx < V ENX_TH1
2. SOFT ? START MODE;
when V ENX_TH1 < V ENx < V ENX_TH2
3. ENABLE MODE (or NORMAL OPERATION):
when V ENX > V ENX_TH2
Vsync
0
2ndary currents
0
PWM REG
0
PWM SS
0
DRV
Result
0
At the end of the soft ? start mode (duration fixed by the
capacitor connected to enable pin) if the output voltage is not
entered in regulation then the duty cycle is fixed to 100%
until the output reaches the regulation.
If the soft ? start mode takes a longer time than the time
needed to reach the regulation level, the controller enters in a
mixed mode. During the mixed mode the duty cycle is a mixed
of the soft ? start mode duty cycle generation and the duty cycle
from the normal regulation. Thus the transition from the
soft ? start mode and the normal operation is done smoothly
without discontinuity on the duty cycle (see Figure 45).
t
t
t
t
t
Soft Start Mode
Mixed Mode
Normal Mode
Figure 45. End of Startup Sequence Illustrating the Smooth Transition
from Soft ? Start to Normal Mode via the Mixed Mode
http://onsemi.com
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