参数资料
型号: NCP1603D100R2G
厂商: ON Semiconductor
文件页数: 29/30页
文件大小: 302K
描述: IC CTLR PFC/PWM COMBO 16-SOIC
产品变化通告: Product Discontinuation 21/Jun/2007
标准包装: 2,500
模式: 临界传导(CRM),间歇导电(DCM)
频率 - 开关: 58kHz
电流 - 启动: 17µA
电源电压: 9 V ~ 18 V
工作温度: -40°C ~ 125°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)
NCP1603
http://onsemi.com
29
PFC Toggling
The variation of the duty ratio in the PWM stage between
the PFCon or PFCoff can be very large. When the
NCP1603 circuit is operating at some conditions between
PFC on and off boundary, the duty ratio variation can lead
to unwanted on/off toggling in the PFC stage. A current
feedforward resistor R
FF
 is hence recommended to added
between V
aux
 and CS2 pin (pins 1 and 3) in Figure 76 to
prevent the toggling. The value of R
FF
 is much larger than
current sense feedback resistor R
S2
 and plays very little
effect when V
aux
 = 0 (or PFC is off). When V
aux
 is available
(or PFC is on), the R
FF
 creates a positive offset on the CS2
pin voltage and it allows the feedback voltage V
FB2
 to only
shift slightly but provide a dramatic duty cycle reduction
in Figure 77. It slight movement of the feedback voltage
can reduce the change to reach the PFC stage on/off
threshold. Hence, the current feedforward resistor can help
to improve the toggling.
CS2
R
FF
R
S2
V
bulk
V
aux
Figure 76. Feedforward Resistor R
FF
 Added
Figure 77. Timing Diagram of PWM Stage When R
FF
is Added
High duty when PFC is off.   Low duty when PFC is on.
Out 2
V
CS2
V
aux
V
FB2
3
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