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NCP1239_V01中文資料安森美半導體數據手冊PDF規(guī)格書
NCP1239_V01規(guī)格書詳情
The NCP1239 is a fixed-frequency current-mode controller
featuring a high-voltage start-up current source to provide a quick and
lossless power-on sequence. This function greatly simplifies the
design of the auxiliary supply and the VCC capacitor by activating the
internal start-up current source to supply the controller during start-up,
transients, latch, stand-by etc.
With a supply range up to 35 V, the controller hosts a jittered 65 or
100-kHz switching circuitry operated in peak current mode control.
When the power on the secondary side starts to decrease, the controller
automatically folds back its switching frequency down to minimum
level of 26 kHz. As the power further goes down, the part enters skip
cycle while limiting the peak current that insures excellent efficiency
in light load condition.
NCP1239 features a timer-based fault detection circuitry that
ensures a quasi-flat overload detection, independent of the input voltage.
Features
? Fixed-Frequency 65-kHz or 100-kHz Current-Mode Control
Operation
? Frequency Foldback Down to 26 kHz and Skip Mode to Maximize
Performance in Light Load Conditions
? Adjustable Over Power Protection (OPP) Circuit
? High-Voltage Current Source with Brown-Out (BO) Detection
? Internal Slope Compensation
? Internal Fixed Soft-Start
? Frequency Jittering in Normal and Frequency Foldback Modes
? 64-ms Timer-Based Short-Circuit Protection with Auto-Recovery or
Latched Operation
? Pre-Short Ready for Latched OCP Versions
? Latched OVP on VCC – Autorecovery for C and E Versions
? Latched OVP/OTP Input for Improved Robustness
? 35-V VCC Operation
? ±500 mA Peak Source/Sink Drive Capability
? Internal Thermal Shutdown
? Extremely Low No-Load Standby Power
? Pin-to-Pin Compatible with the Existing NCP1236/1247 Series
? These Devices are Pb-Free and are RoHS Compliant
Typical Applications
? AC-DC Converters for TVs, Set-Top Boxes and Printers
? Offline Adapters for Notebooks and Netbooks
| 供應商 | 型號 | 品牌 | 批號 | 封裝 | 庫存 | 備注 | 價格 |
|---|---|---|---|---|---|---|---|
onsemi(安森美) |
24+ |
SOP7 |
7350 |
現貨供應,當天可交貨!免費送樣,原廠技術支持!!! |
詢價 | ||
ON/安森美 |
24+ |
NA/ |
3264 |
原裝現貨,當天可交貨,原型號開票 |
詢價 | ||
ON/安森美 |
21+ |
SOP-8 |
5000 |
一級代理,專注軍工、汽車、醫(yī)療、工業(yè)、新能源、電力 |
詢價 | ||
ON |
24+ |
SOIC-7 |
25000 |
ON全系列可訂貨 |
詢價 | ||
ON |
22+ |
NA |
4495 |
原裝正品支持實單 |
詢價 | ||
onsemi(安森美) |
2021+ |
SOIC-7 |
499 |
詢價 | |||
ON/安森美 |
21+ |
9850 |
只做原裝正品假一賠十!正規(guī)渠道訂貨! |
詢價 | |||
ON(安森美) |
23+ |
標準封裝 |
8000 |
正規(guī)渠道,只有原裝! |
詢價 | ||
ON(安森美) |
6000 |
詢價 | |||||
ON Semiconductor |
22+ |
9000 |
原廠渠道,現貨配單 |
詢價 |
