欧美成人免费电影,国产欧美一区二区三区精品酒店,精品国产a毛片,色网在线免费观看

參數資料
型號: NCP1217P65G
廠商: ON SEMICONDUCTOR
元件分類: 穩壓器
英文描述: Enhanced PWM Current−Mode Controller for High−Power Universal Off−Line Supplies
中文描述: 0.5 A SWITCHING CONTROLLER, 71.5 kHz SWITCHING FREQ-MAX, PDIP8
封裝: LEAD FREE, PLASTIC, DIP-8
文件頁數: 14/18頁
文件大小: 249K
代理商: NCP1217P65G
NCP1217, NCP1217A
http://onsemi.com
14
Figure 27. A Negative Spike Takes Place on the Bulk Capacitor at the SwitchOff Sequence
Vcc 5 V/DIV
Vlatch 1 V/DIV
Time 10 ms/DIV
Simple and inexpensive cures exist to prevent from
internal parasitic SCR activation. One of them consists in
inserting a resistor in series with the highvoltage pin to
keep the negative current to the lowest when the bulk
becomes negative (Figure 28). Please note that the negative
spike is clamped to (2*Vf) thanks to the diode bridge. Also,
the power dissipation of this resistor is extremely small since
it only heats up during the startup sequence.
Another option (Figure 29) consists in wiring a diode
from V
CC
to the bulk capacitor to force V
CC
to reach
VCC
ON
sooner and thus stops the switching activity before
the bulk capacitor gets deeply discharged. For security
reasons, two diodes can be connected in series.
Figure 28. A simple resistor in series avoids any
latchup in the controller . . .
Figure 29. . . . or one diode forces V
CC
to reach
VCC
ON
sooner.
8
7
6
5
1
2
3
4
+
Cbulk
Rbulk
4.7 k
+
CV
CC
1
3
2
8
7
6
5
1
2
3
4
+
Cbulk
+
D3
1N4007
CV
CC
1
3
相關PDF資料
PDF描述
NCP1217P65 Enhanced PWM Current-Mode Controller for High-Power Universal Off-Line Supplies
NCP1337 PWM Current−Mode Controller for Free Running Quasi−Resonant Operation
NCP1337DR2G PWM Current−Mode Controller for Free Running Quasi−Resonant Operation
NCP1337PG PWM Current−Mode Controller for Free Running Quasi−Resonant Operation
NCP1351 Variable Off Time PWM Controller
相關代理商/技術參數
參數描述
NCP1218 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Controller with Adjustable Skip Level and External Latch Input
NCP1218AD65R2G 功能描述:電流型 PWM 控制器 ANA PWM CONTROLLER RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
NCP1219 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Controller with Adjustable Skip Level and External Latch Input
NCP1219AD100R2G 功能描述:電流型 PWM 控制器 ANA PWM CONTROLLER RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
NCP1219AD65R2G 功能描述:電流型 PWM 控制器 ANA PWM CONTROLLER RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
主站蜘蛛池模板: 天津市| 高雄市| 阳高县| 邛崃市| 成都市| 罗江县| 瓮安县| 石阡县| 通渭县| 固原市| 泾川县| 建水县| 新沂市| 延吉市| 咸丰县| 盐城市| 普兰店市| 斗六市| 蒲江县| 卓资县| 阳东县| 凌源市| 班玛县| 东乡县| 伊宁市| 临颍县| 广河县| 林口县| 富顺县| 兴国县| 榆社县| 襄汾县| 如东县| 内丘县| 卢龙县| 大姚县| 永定县| 灌云县| 六盘水市| 曲阜市| 孝义市|