参数资料
型号: NCP1910A65DWR2G
厂商: ON Semiconductor
文件页数: 24/37页
文件大小: 0K
描述: IC COMBO CTLR ATX 24-SOIC
标准包装: 1
模式: 连续导电(CCM)
频率 - 开关: 245 kHz
电流 - 启动: 100µA
安装类型: 表面贴装
封装/外壳: 24-SOIC(0.295",7.50mm 宽)23 引线
供应商设备封装: 24-SOIC W
包装: 标准包装
其它名称: NCP1910A65DWR2GOSDKR
NCP1910
? V ac,on is the rms ac voltage to starts PFC operating.
? V ac,off the rms ac voltage for line brown ? out
detection.
PFC Current Sense
I L
PFC Over ? Power 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 LBO represents the rms input voltage.
The product (I CS x V LBO ) represents an approximated input
power (I L x V ac ). It is illustrated in Figure 48.
R CS
I CS CS
NCP1910
V in
I L
+
GND
R SENSE
I L
V CS
?
R SENSE
I CS + I L
I CS
R LBOU
R LBOL
Figure 47. PFC Current Sensing Configuration
The device senses the inductor current I L by the current
sense scheme in Figure 47. The device maintains the voltage
at CS pin to be zero voltage, i.e. V CS = 0 V, so that
R SENSE
(eq. 13)
R CS
Where:
? R SENSE is the sense resistor to sense I L .
? R CS is the offset resistor between CS pin and
R SENSE .
This scheme has the advantage of the minimum number
of components for current sensing. The sense current I CS
represents the inductor current I L and will be used in the PFC
duty modulation to generate the multiplier voltage V M ,
Over ? Power Limitation (OPL), and Over ? Current
Protection. Equation 13 would insist in the fact that it
provides the flexibility in the R SENSE choice and that it
allows to detect in ? rush currents.
R CS
CS
Current
mirror
LBO OPL
> 275 m VA?
C LBO
Figure 48. PFC Over ? Power Limitation Configuration
When the product (I CS x V LBO ) is greater than a
permissible level 275 m VA, the device turns off the PFC
driver so that the input power is limited. The OPL is
automatically deactivated when the product (I CS x V LBO ) is
lower than the 275 m VA level. This 275 m VA level
corresponds to the approximated input power (I L x Vac) to
be smaller than the particular expression in Equation 15.
I L
R CS
PFC Over ? Current Protection (OCP)
PFC Over ? Current Protection is reached when I CS is
larger than I S(OCP) (200 m A typical). The offset voltage of
the CS pin is typical 10 mV and it is neglected in the
calculation. Hence, the maximum OCP inductor current
I CS V LBO t 275 m VA
R SENSE 2 2 K LBO
p
@ V ac
t 275 m VA
(eq. 15)
R CS I S OCP
R CS
R LBOU ) R LBOL
threshold I L(OCP) is obtained in Equation 14.
I L OCP + + 200 m A (eq. 14)
R SENSE R SENSE
When over ? current protection threshold is reached, the
PFC drive goes low. The device automatically resumes
operation when the inductor current goes below the
I L @ V ac t
Where
R CS @ p
R SENSE @ K LBO
K LBO +
@ 97 m VA
R LBOL
threshold.
http://onsemi.com
24
相关PDF资料
PDF描述
SRR1280-221K INDUCTOR POWER 220UH 1.60A SMD
EGM43DTMN CONN EDGECARD 86POS R/A .156 SLD
T95R337K016LZSL CAP TANT 330UF 16V 10% 2824
RAC20-24SB CONV AC/DC 20W 24V OUT SNGL T/H
VE-J4N-CX-F3 CONVERTER MOD DC/DC 18.5V 75W
相关代理商/技术参数
参数描述
NCP1910B65DWR2G 功能描述:交流/直流开关转换器 GREENM COMBO 2GND N/SKIP RoHS:否 制造商:STMicroelectronics 输出电压:800 V 输入/电源电压(最大值):23.5 V 输入/电源电压(最小值):11.5 V 开关频率:115 kHz 电源电流:1.6 mA 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:SSO-10 封装:Reel
NCP1910GEVB 功能描述:电源管理IC开发工具 NCP1910DEMO-B-TLS RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
NCP1927DR2G 功能描述:功率因数校正 IC PFC AND FLYBACK CONTROLER RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel
NCP1937A1DR2G 制造商:ON Semiconductor 功能描述:COMBO PFC & QUAZI FLYBACK - Tape and Reel 制造商:ON Semiconductor 功能描述:REEL / COMBO PFC & QUAZI FLYBACK
NCP1937B1DR2G 制造商:ON Semiconductor 功能描述:COMBO PFC & QUAZI FLYBACK - Tape and Reel