參數(shù)資料
型號： NCP1603D100R2G
廠商： ON Semiconductor
文件頁數(shù)： 22/30頁
文件大?。?/td> 302K
描述： IC CTLR PFC/PWM COMBO 16-SOIC
產(chǎn)品變化通告： Product Discontinuation 21/Jun/2007
標準包裝： 2,500
模式： 臨界傳導(dǎo)（CRM），間歇導(dǎo)電（DCM）
頻率 - 開關(guān)： 58kHz
電流 - 啟動： 17µA
電源電壓： 9 V ~ 18 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC
包裝： 帶卷 (TR)
NCP1603
http://onsemi.com
22
DCM needs higher peak inductor current comparing to
CRM in the same averaged input current. Hence, CRM is
generally preferred at around the sinusoidal peak for lower
the maximum current stress but DCM is also preferred at
the nonpeak region to avoid excessive switching
frequencies. Because of the variablefrequency feature of
the CRM and constantfrequency feature of DCM,
switching frequency is the maximum in the DCM region
and hence the minimum switching frequency will be found
at the moment of the sinusoidal peak.
DCM PFC Circuit
A DCM/CRM PFC boost converter is shown in
Figure 58. Input voltage is a rectified 50 or 60 Hz
sinusoidal signal. The MOSFET is switching at a high
frequency (typically around 100 kHz) so that the inductor
current I
L
  basically consists of highfrequency and
lowfrequency components.
Figure 58. DCM/CRM PFC Boost Converter
V
in
I
in
I
L
L
V
out
C
bulk
C
filter
Filter capacitor C
filter
 is an essential and very small value
capacitor in order to eliminate the highfrequency content
of the DCM inductor current I
L
. This filter capacitor cannot
be too bulky because it can pollute the power factor by
distorting of the rectified sinusoidal input voltage.
PFC Methodology
The PFC section uses a proprietary PFC methodology
particularly designed for both DCM and CRM operation.
The PFC methodology is described in this section.
Figure 59. Inductor Current in DCM
t
1
t
2
t
3
I
pk
T
time
Inductor Current
As shown in Figure 59, the inductor current I
L
 of each
switching cycle starts from zero in DCM. CRM is a special
case of DCM when t
3
 = 0. When the PFC boost converter
MOSFET is on, the inductor current I
L
 increases from zero
to I
pk
 for a time duration t
1
 with inductance L and input
voltage V
in
. Equation 3 is formulated.
V
in
+ L
I
pk
t
1
(eq. 3)
The input filter capacitor C
filter
 and the frontended EMI
filter absorb the highfrequency component of inductor
current. It makes the input current I
in
 a lowfrequency
signal.
I
in
+
I
pk
(t
1
) t
2
)
2 T
for DCM
(eq. 4)
I
in
+
I
pk
2
for CRM
(eq. 5)
From Equations 3, 4, and 5, the input impedance Z
in
 is
formulated.
Z
in
+
V
in
I
in
+
2TL
t
1
(t
1
) t
2
)
for DCM
(eq. 6)
Z
in
+
V
in
I
in
+
2L
t
1
for CRM
(eq. 7)
Power factor is corrected when the input impedance Z
in
in Equations 6 and 7 are constant or slowly varying.
Figure 60. PFC Modulation Circuit and Timing
Diagram

+
closed when
output low
Turns off
MOSFET
Ramp
12
C
ramp
I
ch
V
ton
V
ton
ramp
out1
PWM
Comparator
The MOSFET on time t
1
 of PFC modulation duty is
generated by a feedback signal V
ton
 and a ramp. The PFC
modulation circuit and timing diagram are shown in
Figure 60. A relationship in Equation 8 is obtained.
t
1
+
C
ramp
V
ton
I
ch
(eq. 8)
The charging current I
ch
 is constant 100 mA current and
the ramp capacitor C
ramp
 is constant for a particular design.
Hence, according to Equation 8, the MOSFET on time t
1
is proportional to V
ton
.
In order to protect the PFC modulation comparator, the
maximum voltage of V
ton
  is limited to internal clamp
V
ton(max)
 (3.9 V typical) and the ramp pin (Pin 12) is with
相關(guān)PDF資料
PDF描述
NCP1605DR2G IC PFC CONTROLLER CCM/DCM 16SOIC
NCP1606BDR2G IC POWER FACTOR CONTROLLER 8SOIC
NCP1607BDR2G IC PFC CONTROLLER CRM 8SOIC
NCP1611BDR2G IC PFC CTLR HE ENHANCED 8-SOIC
NCP1651DR2G IC PFC CONTROLLER CCM/DCM 16SOIC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
NCP1605ADR2G 功能描述:功率因數(shù)校正 IC ENHANCED PFC CNTRLER RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
NCP1605BDR2G 功能描述:功率因數(shù)校正 IC High Volt Stby Mode Power Fact Corr Cont RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
NCP1605DR2G 功能描述:功率因數(shù)校正 IC Enhanced PFC HV and Eff Standby RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
NCP1605FORWGEVB 功能描述:電源管理IC開發(fā)工具 NCP1605 152 W FORWARD EVB RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
NCP1605LCDTVGEVB 功能描述:BOARD EVAL NCP1605/1396 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:* 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- 主要目的:電源管理，電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*