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| 型号： | NCP1653DR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC PFC CONTROLLER CCM 8SOIC |
| 标准包装： | 1 |
| 模式： | 连续导电（CCM） |
| 频率 - 开关： | 90kHz ~ 110kHz |
| 电源电压： | 8.75 V ~ 18 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 标准包装 |
| 其它名称： | NCP1653DR2GOSDKR |
NCP1653, NCP1653A
2 Vac * 4 V Vac
Ivac +
[
IS +
IL
Pin + ac +
Vout
Vcontrol
96% I ref ref I FB
R1
Pout + h Pin + h
Vout
stands for the RMS. I vac is a constant in the 50 or 60 Hz
bandwidth. Multiplier resistor R M is the external resistor
connected to the multiplier voltage V M pin (Pin 5). It is also
constant. R M directly limits the maximum input power
capability and hence its value affects the NCP1653 to
operate in either “follower boost mode” or “ constant
output voltage mode”.
(eq.9)
Rvac ) 12 k W R vac
Sense current I S is proportional to the inductor current I L
as described in (eq.10). I L consists of the high ? frequency
component (which depends on di/dt or inductor L) and
low ? frequency component (which is I L ? 50 ).
RCS (eq.10)
RS
Control current I control is a roughly constant current that
comes from the PFC output voltage V out that is a slowly
varying signal. The bandwidth of I control can be
additionally limited by inserting an external capacitor
C control to the control voltage V control pin (Pin 2) in
Figure 30. It is recommended to limit f control , that is the
bandwidth of V control (or I control ), below 20 Hz typically to
achieve power factor correction purpose. Typical value of
C control is between 0.1 m F and 0.33 m F.
V reg
300 k
I control =
I
Regulation Block
over the bandwidth of 50 or 60 Hz and power factor is
corrected.
Practically, the differential ? mode inductance in the
front ? ended EMI filter improves the filtering performance
of capacitor C filter . Therefore, the multiplier capacitor C M
is generally with a larger value comparing to the filter
capacitor C filter .
Input and output power (P in and P out ) are derived in
(eq.13) when the circuit efficiency η is obtained or
assumed. The variable V ac stands for the RMS input
voltage.
V 2 2 RS R vac Icontrol Vref Vac
Zin RM RCS Vout
(eq.13a)
Icontrol Vac
T
2 RS R vac Icontrol Vref Vac
RM RCS Vout
(eq.13b)
Icontrol Vac
T
Follower Boost
The NCP1653 operates in follower boost mode when
I control is constant. If I control is constant based on (eq.13), for
a constant load or power demand the output voltage V out of
the converter is proportional to the RMS input voltage V ac . It
means the output voltage V out becomes lower when the RMS
input voltage V ac becomes lower. On the other hand, the
output voltage V out becomes lower when the load or power
demand becomes higher. It is illustrated in Figure 31.
Vcontrol
2
Ccontrol
V out (Traditional boost)
Figure 30. V control Low ? Pass Filtering
V out (Follower boost)
Ccontrol u
1
2 p 300 k W fcontrol
(eq.11)
V in
From (eq.7) ? (eq.10), the input impedance Z in is
re ? formulated in (eq.12).
time
Zin +
RM RCS Vac Vout IL
2 RS R vac Icontrol Vref IL ? 50
P out
Zin +
RM RCS Vac Vout
2 RS R vac Icontrol Vref
whenIL + IL ? 50
(eq.12)
Figure 31. Follower Boost Characteristics
time
The multiplier capacitor C M is the one to filter the
high ? frequency component of the multiplier voltage V M .
The high ? frequency component is basically coming from
the inductor current I L . On the other hand, the filter
capacitor C filter similarly removes the high ? frequency
component of inductor current I L . If the capacitors C M and
C filter match with each other in terms of filtering capability,
I L becomes I L ? 50 . Input impedance Z in is roughly constant
Follower Boost Benefits
The follower boost circuit offers an opportunity to reduce
the output voltage V out whenever the RMS input voltage
V ac is lower or the power demand P out is higher. Because
of the step ? up characteristics of boost converter, the output
voltage V out will always be higher than the input voltage
V in even though V out is reduced in follower boost operation.
http://onsemi.com
11
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