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参数资料
| 型号： | NCP1654PFCGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 20/23页 |
| 文件大小： | 228K |
| 描述： | EVAL BOARD FOR NCP1654PFCG |
| 设计资源： | NCP1654EVB BOM NCP1654EVB Gerber Files NCP1654EVB Schematic |
| 标准包装： | 1 |
| 主要目的： | AC/DC，次级 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 378 ~ 401 V |
| 输入电压： | 85 ~ 230 VAC，15VDC |
| 稳压器拓扑结构： | 升压 |
| 频率 - 开关： | 65kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP1654 |
| 其它名称： | NCP1654PFCGEVBOS |
NCP1654
http://onsemi.com
20
Figure 45. BrownOut Protection
+
-
BO
4
R
boL
R
boU
C
BO
Vbo
V
in
+
V
ac
+
IN
V
boH
/ V
boL
V
boH
= 1.3 V, V
boL
= 0.7 V
After Device Operates
Before Device Operates
Hence a larger hysteresis of the brown out comparator is
needed, which is 0.7 V typical in this device. When V
bo
goes below than V
BOL
(0.7 V typical), the device turns off
the Drive output and keeps it off till V
bo
exceeds V
BOH
(1.3 V typical). When the device awakes after an offstate
(Undervoltage lockout or shutdown), the default threshold
is V
BOH
.
Overpower Limitation (OPL)
This is a second OCP with a threshold that is line
dependent. Sense current I
cs
represents the inductor current
I
L
and hence represents the input current approximately.
Input voltage signal V
bo
represents the rms input voltage.
The product (I
cs
?V
bo
) represents an approximated input
power (I
L
?V
ac
). It is illustrated in Figure 46.
Figure 46. OverPower Limitation
Current Mirror
>200 mVA?
OPL
+
RCS
ICS
CS
Vbo
4
3
R
SENSE
V
in
I
L
I
CS
+ I
L
R
SENSE
R
CS
When the product (I
cs
?V
bo
) is greater than a permissible
level 200 mVA, the device turns off the drive output so that
the input power is limited. The OPL is automatically
deactivated when the product (I
cs
?V
bo
) is lower than the
200 mVA level. This 200 mVA level corresponds to the
approximated input power (I
L
?V
ac
) to be smaller than the
particular expression in (Equation 23).
(eq. 23)
I
cs
V
bo
t 200 mVA
I
L
R
SENSE
R
CS
@
2 2
K
BO
p
@ V
ac
t 200 mVA
I
L
@ V
ac
t
R
CS
@ p
R
SENSE
@ K
BO
@ 50 2
mVA
Bias the Controller
It is recommended to add a typical 1 nF to 100 nF
decoupling capacitor next to the V
cc
pin for proper
operation. When the NCP1654 operates in follower boost
mode, the PFC output voltage is not always regulated at a
particular level under all application range of input voltage
and load power. It is not recommended to make a
lowvoltage bias supply voltage by adding an auxiliary
winding on the PFC boost inductor. Alternatively, it is
recommended to get the V
cc
biasing supply from the
2
nd
stage power conversion stage.
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