參數(shù)資料
型號： NCP1601BDR2G
廠商： ON Semiconductor
文件頁數(shù)： 13/19頁
文件大小： 257K
描述： IC PFC CTRL CRM/TRANSITION 8SOIC
產品變化通告： NCP1601BDR2G Discontinuation 11/May/2012
標準包裝： 1
模式： 臨界傳導（CRM），間歇式（轉換）
頻率 - 開關： 58kHz
電流 - 啟動： 17µA
電源電壓： 9.6 V ~ 18 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應商設備封裝： 8-SOICN
包裝： 剪切帶 (CT)
其它名稱： NCP1601BDR2GOSCT
NCP1601A, NCP1601B
http://onsemi.com
13
voltage  is  higher  based  on  the  regulation  block
characteristic in Figure 31. On the other hand, the V
control
in the low V
ac
condition is much higher than the high V
ac
condition. In order to not over- -design the circuit in the
application, the V
control
in the low V
ac
condition is usually
very closed to V
control(max)
. It makes the output voltage be
almost 96% of the nominal value of R
FB
?I
ref
in low V
ac
condition while the output voltage is almost 100% of the
nominal value R
FB
?I
ref
in high V
ac
condition.
The feedback resistor R
FB
consists of two or three high
precisionresistorsinordertosetthenominalV
out
precisely
and safety purpose.
The regulation block output V
reg
is connected to control
voltage  V
control
through an  internal  resistor  R
control
(300 k?typical) for the low- -pass filter in Figure 30. The
V
control
and the time information of zero current are
collected in the V
control
processing circuit to generate V
ton
which is then compared to a ramp signal to generate the
MOSFET on time t
1
for power factor correction.
Overvoltage Protection (OVP)
WhenthefeedbackcurrentI
FB
ishigherthan107%ofthe
reference current I
ref
(i.e., the output voltage V
out
ishigher
than 107% of its nominal value), the Drive Output pin
(Pin7)ofthe device goeslowforprotectionand the switch
of the V
control
processing circuit is kept off. The circuit
automatically resumes operation when the output voltage
is lower than 107%.
ThemaximumOVPthresholdislimitedto225mAwhich
corresponds to 225 mA ?1.95 M?+ 5 V = 443.75 V when
R
FB
= 1.95 M?(1.8 M?+ 150 k? and V
FB1
= 5 V (for
theworstcasereferringtoFigure11). Hence,itisgenerally
recommendedtouse450Vratingoutputcapacitortoallow
some design margin.
Undervoltage Protection (UVP)
When the feedback current I
FB
is lower than 8% of the
reference current I
ref
(i.e., the output voltage V
out
is lower
than 8% of its nominal value), the device is shut down and
consumes lower than 50 mA. In normal situation of boost
converter configuration, the output voltage V
out
is always
higher than the input voltage V
in
and the feedback current
I
FB
is always higher than 8% of the reference current I
ref
.
It enables the NCP1601 to operate. Hence, UVP happens
when the output voltage is abnormally undervoltage, the
FB pin (Pin 1) is opened, or the FB pin (Pin 1) is manually
pulled low.
Current Sense
The device senses the inductor current I
L
by the current
senseschemeinFigure32.Thisschemehastheadvantages
of:(1)the inrushcurrentlimitationbythe resistorR
CS
,and
(2) the overcurrent protection and zero current detection
implemented in the same pin.
Figure 32. Current Sensing
CS
NCP1601
Gnd
+
- -
R
CS
R
S
I
L
I
S
I
L
V
S
Inductor current I
L
passes through R
CS
and creates a
negative voltage. This voltage is measured by a current I
S
flowing out of the CS pin (Pin 4). The CS pin has an offset
voltage V
S
. This offset voltage is studied in the setting of
zero inductor current I
L(ZCD)
and the maximum inductor
current I
L(OCP)
(i.e., overcurrent protection threshold). A
typical variation of offset voltage V
S
versus sense current
I
S
is shown in Figure 15. Higher the value of the offset
voltage atlowcurrentregioncreateslowerthe zerocurrent
threshold for better accuracy. Based on Figure 32, (eq.13)
is derived.
(eq.13)
V
S
 R
S
I
S
= - -R
CS
I
L
Zero Current Detection (ZCD)
ThedevicerecognizeszeroinductorcurrentwhentheCS
pin (Pin 4) sense current I
S
is lower than I
S(ZCD)
(14 mA
typical). The offset voltage of the CS pin in this condition
is V
S(ZCD)
(7.5 mV typical). It is illustrated in Figure 33.
The inductor current I
L(ZCD)
at the ZCD condition is
derived in (eq.14).
(eq.14)
I
L(ZCD)
=
R
S
I
S(ZCD)
 V
S(ZCD)
R
CS
It is obvious that the I
L(ZCD)
is not always zero. In order
to make it reasonably close to zero, the settings of R
S
and
R
CS
are crucial.
Figure 33. CS Pin Characteristic when I
L
= 0
I
S(ZCD)
V
S(ZCD)
R
S
> R
S(ZCD)
R
S
= R
S(ZCD)
V
S
Operating ZCD point
Ideal ZCD point
I
S
相關PDF資料
PDF描述
NCP1603D100R2G IC CTLR PFC/PWM COMBO 16-SOIC
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
相關代理商/技術參數(shù)
參數(shù)描述
NCP1601BP 功能描述:功率因數(shù)校正 IC Fixed Frequency RoHS:否 制造商:Fairchild Semiconductor 開關頻率: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
NCP1601BPG 功能描述:功率因數(shù)校正 IC Fixed Frequency DCM/CRM PFC RoHS:否 制造商:Fairchild Semiconductor 開關頻率: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
NCP1603D100R2 功能描述:功率因數(shù)校正 IC High Voltage Startup RoHS:否 制造商:Fairchild Semiconductor 開關頻率: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
NCP1603D100R2G 功能描述:功率因數(shù)校正 IC ANA PFC/PWM COMBO CONTROL RoHS:否 制造商:Fairchild Semiconductor 開關頻率: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
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
發(fā)布緊急采購，3分鐘左右您將得到回復。

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

*
*
*