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NCP1937C61DR2G PDF预览

NCP1937C61DR2G

更新时间： 2024-09-19 00:54:23
品牌 Logo 应用领域
安森美 - ONSEMI /
页数 文件大小 规格书
38页 970K
描述
Combination Power Factor Correction and Quasi-Resonant Flyback Controllers for Adapters

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NCP1937C61DR2G 数据手册

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NCP1937  
Combination Power Factor  
Correction and Quasi-  
Resonant Flyback  
Controllers for Adapters  
www.onsemi.com  
MARKING DIAGRAM  
This combination IC integrates power factor correction (PFC) and  
quasi−resonant flyback functionality necessary to implement a  
compact and highly efficient Switched Mode Power Supply for an  
adapter application.  
The PFC stage exhibits near−unity power factor while operating in a  
Critical Conduction Mode (CrM) with a maximum frequency clamp.  
The circuit incorporates all the features necessary for building a robust  
and compact PFC stage while minimizing the number of external  
components.  
1
20  
HV/X2  
BO/X2  
PFBHV  
PFBLV  
GND  
PControl  
PONOFF  
QCT  
PCS/PZCD  
PDRV  
QDRV  
QCS  
SOIC−20  
Narrow Body  
CASE 751BS  
Fault  
PSTimer  
QFB  
VCC  
The quasi−resonant current−mode flyback stage features a  
proprietary valley−lockout circuitry, ensuring stable valley switching.  
QZCD  
th  
NCP1937 = Specific Device Code  
This system works down to the 4 valley and toggles to a frequency  
xx  
A
WL  
YY  
WW  
G
= A1, A2, A3, B1, B2, B3, C1, C4 or C61  
= Assembly Location  
= Wafer Lot  
= Year  
= Work Week  
th  
foldback mode with a minimum frequency clamp beyond the 4  
valley to eliminate audible noise. Skip mode operation allows  
excellent efficiency in light load conditions while consuming very low  
standby power consumption.  
= Pb−Free Package  
Common General Features  
• Wide V Range from 9 V to 30 V with Built−in Overvoltage  
CC  
Protection  
ORDERING INFORMATION  
See detailed ordering and shipping information on page 5 of  
this data sheet.  
• High−Voltage Startup Circuit and Active Input Filter Capacitor  
Discharge Circuitry for Reduced Standby Power  
• Integrated High−Voltage Brown−Out Detector  
• Integrated High−Voltage Switch Disconnects PFC Feedback Resistor  
Divider to Reduce Standby Power  
• Fault Input for Severe Fault Conditions, NTC  
Compatible (Latch and Auto−Recovery Options)  
• 0.5 A / 0.8 A Source / Sink Gate Drivers  
• Feed−Forward for Improved Operation across Line and  
Load  
• Adjustable PFC Disable Threshold Based on Output  
Power  
• Internal Temperature Shutdown  
• Power Savings Mode Reduces Supply Current  
Consumption to 70 mA Enabling Very Low Input Power  
Applications  
QR Flyback Controller Features  
• Valley Switching Operation with Valley−Lockout for  
Noise−Free Operation  
• Frequency Foldback with Minimum Frequency Clamp  
for Highest Performance in Standby Mode  
• Minimum Frequency Clamp Eliminates Audible Noise  
PFC Controller Features  
• Critical Conduction Mode with Constant On Time  
Control (Voltage Mode) and Maximum Frequency  
Clamp  
• Timer−Based Overload Protection (Latched or  
• Accurate Overvoltage Protection  
Auto−Recovery options)  
• Adjustable Overpower Protection  
• Winding and Output Diode Short−Circuit Protection  
• 4 ms Soft−Start Timer  
• Bi−Level Line−Dependent Output Voltage  
• Fast Line / Load Transient Compensation  
• Boost Diode Short−Circuit Protection  
© Semiconductor Components Industries, LLC, 2015  
1
Publication Order Number:  
June, 2015 − Rev. 4  
NCP1937/D  
1234567...38

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