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| 型号： | NCP1910GEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 25/37页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO NCP1910DEMO-B-TLS |
| 设计资源： | NCP1910 Schematic NCP1910GEVB BOM |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 最低可调至 0.8V |
| 电流 - 输出： | 3A |
| 输入电压： | 3 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP1910 |
| 其它名称： | NCP1910GEVBOS |
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NCP1910
PFC Reference Section
The internal reference voltage (V PREF ) is trimmed to be
± 2% accurate over the temperature range (the typical value
is 2.5 V). V PREF is the reference used for the regulation of
PFC section.
PFC Feedback and Compensation
V CTRL R FBL @ G EA R Z 1 ) sR Z C Z
+ @ (eq. 17)
V bulk R FBL ) R FBU sR Z C Z 1 ) sR Z C P
PFC Power Analysis and V in2 Feed ? Forward
From Equation 7 through 13, the input impedance Z in is
re ? formulated in Equation 18.
V in
V bulk
Z in +
2R M R SENSE @ K LBO 2 @ V ac 2 @ V bulk I L
p 2 R CS @ V CTRL * V CTRL min @ V PREF I L ? 50
(eq. 18)
When I L is equal to I L ? 50 , Equation 18 is re ? formulated in
Equation 19.
R FBL
R FBU
FB
V PREF
V CTRL
OTA
V CTRL(min)
2R M R SENSE @ K LBO 2 @ V ac 2 @ V bulk
Z in + (eq. 19)
p 2 R CS @ V CTRL * V CTRL min @ V PREF
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
R Z
To Multiplier of V M pin
C P
C Z
Figure 49. V CTRL Type ? 2 Compensation
The output voltage V bulk of the PFC circuits is sensed at
FB pin via the resistor divider (R FBL and R FBU ) as shown in
Figure 49. V bulk is regulated as described in Equation 16.
the inductor current I L . On the other hand, the input filter
capacitor C in similarly removes the high ? frequency
component of inductor current I L . If the capacitors C M and
C in match with each other in terms of filtering capability, I L
becomes I L ? 50 . Input impedance Z in is roughly constant over
the bandwidth of 50 or 60 Hz and power factor is corrected.
Input and output power (P in and P out ) are derived in
Equations 20 and 21 when the circuit efficiency η is
obtained or assumed. The variable V ac stands for the rms
input voltage.
V bulk + V PREF
p 2 @ R CS @ V CTRL * V CTRL min @ V PREF
V CTRL * V CTRL min
R FBU ) R FBL
(eq. 16)
R FBL
The feedback signal V FB represents the output voltage
V bulk and will be used in the output voltage regulation,
Over ? voltage protection (OVP), fast transient response, and
under ? voltage protection (UVP)
The Operational Trans ? conductance Amplifier (OTA)
P in +
T
V ac 2
Z in 2R M R SENSE K LBO 2 @ V bulk
+
V bulk
(eq. 20)
constructs a control voltage, V CTRL , depending on the
output power and hence V bulk . The operating range of
V CTRL is from V CTRL(min) to V CTRL(max) . The signal used
for PFC duty modulation is after decreasing a offset voltage,
P in + h P in + h
p 2 @ R CS @ V CTRL * V CTRL min @ V PREF
2R M R SENSE K LBO 2 @ V bulk
V CTRL * V CTRL min
V CTRL(min) , i.e. V CTRL ? V CTRL(min) .
This control voltage V CTRL is a roughly constant voltage
that comes from the PFC output voltage V bulk that is a slowly
varying signal. The bandwidth of V CTRL can be additionally
limited by inserting the external type ? 2 compensation
components (that are R Z , C Z , and C P as shown in Figure 49).
It is recommended to limit cross over frequency of open loop
system below 20 Hz typically if the input ac voltage is 50 Hz
(eq. 21)
T
V bulk
Because of the V in2 feed ? forward, the power delivery is
independent from input voltage. Hence the transfer function
of power stage is independent from input voltage, which
easies the compensation loop design.
to achieve power factor correction purpose.
The transformer of V bulk to V CTRL is as described in
Equation 16 if C Z >> C P . G EA is the error amplifier gain.
http://onsemi.com
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