参数资料
| 型号： | NCP1378PG |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBACK PWM 7-PDIP |
| 产品变化通告： | Product Obsolescence 01/Jul/2009 |
| 标准包装： | 1 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 100kHz |
| 电源电压： | 8.2 V ~ 18 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 125°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm），7 引线 |
| 包装： | 剪切带 (CT) |
| 其它名称： | NCP1378PGOSCT |
NCP1378
Drain
Signal
Timeout
Signal
Demag RESTART
Current Sense and Timeout Restart
Drain
Signal
Timeout
Signal
5 m s
5 m s
Figure 19. When the primary natural ringing becomes too low, the current
sense initiates a new cycle when FB passes the skip level.
An optocoupler is generally used to transfer the feedback
information to the FB pin while providing the necessary
isolation. It introduces a limitation in how low the skip
level can be adjusted since an optocoupler cannot pull the
FB voltage below its Vce(sat), which is usually around
150 mV. Therefore, in order to take into account
temperature and process variations, it is not recommended
to set up the skip level below 250 mV, which corresponds
to a minimum resistor Rskip of 420 Ω . The 150 mV is a
much lower level than what will usually be used (it sets the
peak current when entering skip mode at 5% of the
7.0
maximum peak current). If anyway a lower skip threshold
is needed, care must be taken to select an optocoupler with
a Vce(sat) guaranteed to be below the chosen skip level
with enough margin.
Demagnetization Detection
The core reset detection is done by monitoring the
voltage activity on the auxiliary winding. This voltage
features a FLYBACK polarity. The typical detection level
is fixed at 50 mV as exemplified by Figure 20.
5.0
3.0
POSSIBLE
RESTARTS
TO INTERNAL
COMPARATOR
3
R esd
2k
4
1
5
R dem
2
1.0
--1.0
0V
50 mV
ESD
ESD
4
1
Aux
Figure 20. Core Reset Detection is Done through
a Dedicated Auxiliary Winding Monitoring
http://onsemi.com
9
Figure 21. Internal Pad Implementation
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| NCP1379 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Quasi-Resonant Current-Mode Controller for High-Power Universal Off-line Supplies |
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| NCP1379DR2G | 功能描述:电流型 PWM 控制器 QUASI-RES CUR MODE CONTRL 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 |
| NCP1380 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Quasi-Resonant Current-Mode Controller for High-Power Universal Off-Line Supplies |
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