- 您现在的位置：买卖IC网 > PDF目录1233 > NCP1631PFCGEVB (ON Semiconductor)BOARD DEMO NCP1631 INTERLEAV PFC PDF资料下载
参数资料
| 型号： | NCP1631PFCGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 17/23页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO NCP1631 INTERLEAV PFC |
| 设计资源： | NCP1631PFCGEVB BOM NCP1631PFCGEVB Gerber Files NCP1631PFCGEVB Schematic |
| 标准包装： | 1 |
| 主要目的： | 电源管理，功率因数校正 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | NCP1631 |
| 已供物品： | 板 |
| 其它名称： | NCP1631PFCGEVBOS |
NCP1631
Figure 17. Typical Waveforms (T delay not shown here for the sake of simplicity)
I pin6 + I FF +
V REGUL
R FF
Frequency Foldback
In addition, the circuit features the frequency fold ? back
function to improve the light load efficiency. Practically,
the oscillator charge and discharge currents (I OSC(CH) and
I OSC(DISCH) of Figure 16) are not constant but dependent on
the power level. More specifically, I OSC(CH) and
I OSC(DISCH) linearly vary as a function of V control output of
the regulation block that thanks to the feed ? forward
featured by the NCP1631, is representative of the load.
The practical implementation is portrayed by Figure 16.
“V REGUL ” is the signal derived from V control that is
effectively used to modulate the MOSFET on ? time.
V REGUL is buffered and applied to pin 6 (“Frequency
fold ? back” pin). A resistor R FF is to be connected to pin 6
to sink a current proportional to V REGUL
.
This current is clamped not to exceed 105 m A and copied
by a current mirror to form I OSC(CH) and I OSC(DISCH) .
As a matter of fact, the oscillator charge current is:
I OSC(CH) + I OSC(clamp) )
V REGUL
R FF
if
V REGUL
R FF
v 105 m A
(eq. 18)
I OSC(CH) + I OSC(clamp) ) I OSC(CH1) + I OSC(CHT1) + 140 m A
The oscillator charge current is then an increasing function of V REGUL and is clamped to 140 m A.
The oscillator discharge current is:
otherwise
I OSC(DISCH) +
V REGUL
R FF
if
V REGUL
R FF
v 105 m A
(eq. 19)
I OSC(DISCH) + I OSC(DISCH1) + 105 m A
otherwise
The oscillator discharge current is also an increasing
function of V REGUL and is clamped to105 m A.
As a consequence, the clamp frequency is also an
increasing function of V REGUL until it reaches a maximum
value for (I FF = 105 m A). If we consider the clamp
frequency f OSC computed by Equation 17 as the nominal
value obtained at full load and if we name it “f OSC(nom) ”:
http://onsemi.com
17
相关PDF资料 |
PDF描述 |
|---|---|
| NCP1650EVB | BOARD EVAL NCP1650 PFC CTLR |
| NCP1652L48VGEVB | BOARD EVAL 100W 48V NCP1652 PFC |
| NCP1653EVB | BOARD EVAL FOR NCP1653 |
| NCP2993FCT2GEVB | BOARD EVAL NCP2993 AUDIO PWR AMP |
| NCP345SNT1G | IC DETECTOR OVER VOLTAGE 5TSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1650DR2 | 功能描述:功率因数校正 IC Fixed Frequency PFC 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 |
| NCP1650DR2G | 功能描述:功率因数校正 IC Fixed Frequency PFC PWM 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 |
| NCP1650EVB | 功能描述:电源管理IC开发工具 EVALUATION BOARD 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 |
| NCP1651DR2 | 功能描述:功率因数校正 IC Single Stage PFC 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 |
| NCP1651DR2G | 功能描述:功率因数校正 IC Single Stage PFC 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 |
发布紧急采购，3分钟左右您将得到回复。