参数资料
| 型号： | NCP1605LCDTVGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/30页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL NCP1605/1396 |
| 设计资源： | NCP1605LCDTVGEVB Schematic NCP1605LCDTVGEVB Gerber Files NCP1605LCDTVGEVB Bill of Materials |
| 标准包装： | 1 |
| 系列： | * |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页当前第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页
NCP1027
Fault Condition – Low Input Voltage
The NCP1027 includes a brown-out circuitry able to
protect the power supply in case of low input voltage
conditions. Figure 30 shows how internally the NCP1027
monitors the voltage image of the bulk capacitor. Below a
given level, the controller blocks the driving pulses, above
it, it authorizes them. The internal circuitry, depicted by
Figure 30a, offers a way to observe the high-voltage (HV)
rail. A resistive divider made of R upper and R lower , brings
a portion of the HV rail on pin 3. Below the turn-on level,
the 10 m A current source IBO is off. Therefore, the turn-on
level solely depends on the division ratio brought by the
resistive divider.
16.0
160
1
vin
2
vcmp
Vbulk = 100 V
Vbulk = 70 V
12.0
120
Vbulk
V DD
Rupper
IBO
ON/OFF
8.00
80.0
BO
+
-
BO
4.00
40.0
Rlower
+
0
0
21
VBO
20.0u
60.0u
100u
140u
180u
Time in Seconds
Figure 30a. The internal brown-out
Figure 30b. Simulation results for 100/70 ON/OFF levels.
configuration with an offset current source.
Figure 30.
To the contrary, when the internal BO signal is high, the IBO source is activated and creates an hysteresis. As a result,
it becomes possible to select the turn-on and turn-off levels via a few lines of algebra.
IBO is Off
IBO is On
V( ) ) + Vbulk1
Rlower
Rlower ) Rupper
(eq. 1)
V( ) ) + Vbulk2
Rlower
Rlower ) Rupper
) IBO
Rlower Rupper
Rlower ) Rupper
(eq. 2)
We can now extract R lower from Equation 1 and plug it into Equation 2, then solve for R upper :
Rupper + Rlower
Vbulk1- VBO
VBO
Rlower + VBO
Vbulk1- Vbulk2
IBO (Vbulk1- VBO)
If we decide to turn-on our converter for Vbulk1 equals 100 V and turn it off for Vbulk2 equals 70 V, then we obtain:
R upper = 3.0 M W
R lower = 18 k W
http://onsemi.com
16
相关PDF资料 |
PDF描述 |
|---|---|
| NCP1608BOOSTGEVB | BOARD EVAL NCP1608 100W BOOST |
| NCP1631PFCGEVB | BOARD DEMO NCP1631 INTERLEAV PFC |
| NCP1650EVB | BOARD EVAL NCP1650 PFC CTLR |
| NCP1652L48VGEVB | BOARD EVAL 100W 48V NCP1652 PFC |
| NCP1653EVB | BOARD EVAL FOR NCP1653 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1606ADR2G | 功能描述:功率因数校正 IC PWR FCTR CONTROLLER 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 |
| NCP1606APG | 功能描述:功率因数校正 IC LO CST PWR FCTR CONT 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 |
| NCP1606BDR2G | 功能描述:功率因数校正 IC PWR FCTR CONTROLLER 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 |
| NCP1606BOOSTGEVB | 功能描述:电源管理IC开发工具 OSPI NCP1606 100 W BOOST 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 |
| NCP1606BPG | 功能描述:功率因数校正 IC LO CST PWR FCTR CONT 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。