参数资料
型号: NCP1234AD65R2G
厂商: ON Semiconductor
文件页数: 26/33页
文件大小: 0K
描述: IC REG CTRLR FLYBACK PWM 7SOIC
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 70kHz
占空比: 85%
电源电压: 9.5 V ~ 28 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 8-SOIC(0.154",3.90mm 宽)7 引线
包装: 带卷 (TR)
NCP1234
LOW LOAD OPERATION
Frequency Foldback
In order to improve the efficiency in light load conditions,
the frequency of the internal oscillator is linearly reduced
from its nominal value down to f OSC(min) . This frequency
foldback starts when the voltage on FB pin goes below
f OSC
Nominal f OSC
Skip
f OSC(min)
V FB(foldS) , and is complete before V FB reaches V skip(in) ,
whatever the nominal switching frequency option is. The
current ? mode control is still active while the oscillator
frequency decreases. Note that the frequency foldback is
disabled if the controller runs at its maximum duty cycle.
V skip(in)
V FB(foldS)
FB
V FB(foldE)
Figure 43. Frequency Foldback when the FB Voltage Decreases
Skip Cycle Mode
?
+
V skip
+
S
Q
DRV stage
FB
CS
K FB
blanking
t LEB
+
?
Figure 44. Skip Cycle Schematic
R
When the FB voltage reaches V skip(in) while decreasing,
skip mode is activated: the driver stops, and the internal
consumption of the controller is decreased. While V FB is
below V skip(out) , the controller remains in this state; but as
soon as V FB crosses the skip out threshold, the DRV pin
starts to pulse again.
http://onsemi.com
26
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