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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)： | 22/30頁 |
| 文件大小： | 432K |
| 代理商： | NCP4326DR2 |
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NCP4326
http://onsemi.com
22
How Does the Enable Pin Work
The
enable
enables/disables the driver and it generates the softstart
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. SOFTSTART MODE;
when V
ENX_TH1
< V
ENx
< V
ENX_TH2
3. ENABLE MODE (or NORMAL OPERATION):
when V
ENX
> V
ENX_TH2
pin
cumulates
two
functions;
it
At the end of the softstart 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 softstart 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 softstart mode duty cycle generation and the duty cycle
from the normal regulation. Thus the transition from the
softstart mode and the normal operation is done smoothly
without discontinuity on the duty cycle (see Figure 45).
0
t
0
t
PWM REG
Vsync
0
t
PWM SS
0
t
DRV
Result
0
t
2ndary currents
Mixed Mode
Normal Mode
Soft Start Mode
Figure 45. End of Startup Sequence Illustrating the Smooth Transition
from SoftStart to Normal Mode via the Mixed Mode
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