- 您现在的位置：买卖IC网 > PDF目录19616 > NCP1246AD100R2G (ON Semiconductor)IC CTLR CURR MODE 100KHZ 8SOIC PDF资料下载
参数资料
| 型号： | NCP1246AD100R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 19/39页 |
| 文件大小： | 0K |
| 描述： | IC CTLR CURR MODE 100KHZ 8SOIC |
| 标准包装： | 2,500 |
| 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页第16页第17页第18页当前第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页第31页第32页第33页第34页第35页第36页第37页第38页第39页
NCP1246
For safety reasons, the start ? up current is lowered when
V CC is below V CC(inhibit) , to reduce the power dissipation in
case the V CC pin is shorted to GND (in case of V CC capacitor
failure, or external pull ? down on V CC to disable the
controller). There is only one condition for which the current
source doesn’t turn on when V CC reaches V CC(inhibit) : the
voltage on HV pin is too low (below V HV(min) ).
HV Sensing of Rectified AC Voltage
The NCP1246 features on its HV pin a true ac line
monitoring circuitry. It includes a minimum start ? up
threshold and an autorecovery brown ? out protection; both
of them independent of the ripple on the input voltage. It is
allowed only to work with an unfiltered, rectified ac input to
ensure the X2 capacitor discharge function as well, which is
described in following. The brown ? out protection
thresholds are fixed, but they are designed to fit most of the
standard ac ? dc conversion applications.
When the input voltage goes below V HV(stop) , a
brown ? out condition is detected, and the controller stops.
The HV current source maintains V CC at V CC(min) level until
the input voltage is back above V HV(start) .
V HV
HV timer elapsed
V HV(start)
V HV(stop)
time
HV stop
t HV
Brown-out
detected
Waits next
time
V CC
V CC(on)
V CC(min)
VccON before
starting
DRV
Brown-out
condition
time
resets the
Internal Latch
time
Figure 49. Ac Line Drop ? out Timing Diagram
When V HV crosses the V HV(start) threshold, the controller
can start immediately. When it crosses V HV(stop) , it triggers
a timer of duration t HV , this ensures that the controller
doesn’t stop in case of line cycle drop ? out.
http://onsemi.com
19
相关PDF资料 |
PDF描述 |
|---|---|
| 189-015-513R571 | CONN DB15 FEM-FEM .625" SPACING |
| ABB56DHFD-S578 | EDGECARD 112POS .050 SMD W/POSTS |
| RCM10DCAN-S189 | CONN EDGECARD 20POS R/A .156 SLD |
| RSO-4815S | CONV DC/DC 1W 36-72VIN 15VOUT |
| RSC49DREF-S13 | CONN EDGECARD 98POS .100 EXTEND |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1246B100DR2G | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Fixed Frequency Current Mode Controller for Flyback Converters |
| NCP1246B65DR2G | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Fixed Frequency Current Mode Controller for Flyback Converters |
| NCP1246BD065R2G | 功能描述:电流型 PWM 控制器 FIXED FREQ (65KHZ) CURREN RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| NCP1246BD100R2G | 功能描述:电流型 PWM 控制器 FIXED FREQ (65KHZ) CURREN RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| NCP1246-D | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Fixed Frequency Current Mode Controller for Flyback Converters |
发布紧急采购，3分钟左右您将得到回复。