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NCP1381

更新时间： 2024-11-08 04:37:59
品牌 Logo 应用领域
安森美 - ONSEMI 控制器
页数 文件大小 规格书
26页 554K
描述
Low−Standby High Performance PWM Controller

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NCP1381 数据手册

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NCP1381  
Low−Standby High  
Performance PWM  
Controller  
Housed in a SO−14 package, the NCP1381 includes everything  
needed to build rugged and efficient Quasi−Resonant (QR) Switching  
Power Supplies. When powered by a front−end Power Factor  
Correction circuitry, the NCP1381 automatically disconnects the PFC  
controller in low output loading conditions (with an adjustable level),  
thus improving the standby power. This is particularly well suited for  
medium to high power offline applications, e.g. notebook adapters.  
When the current setpoint falls below a given value, e.g. the output  
power demand diminishes, the IC automatically enters the so−called  
skip cycle mode and provides excellent efficiency at light loads.  
Because this occurs at an adjustable low peak current together with a  
proprietary Soft−Skipt technique, no acoustic noise takes place. Skip  
cycle also offers the ability to easily select the maximum switching  
frequency at which foldback and standby take place.  
http://onsemi.com  
HIGH PERFORMANCE QR  
CONTROLLER FEATURING PFC  
SHUTDOWN  
MARKING  
DIAGRAM  
14  
SOIC−14  
D SUFFIX  
CASE 751A  
NCP1381G  
AWLYWW  
14  
The NCP1381 also features several efficient protection options like  
a) a short−circuit / overload detection independent of the auxiliary  
voltage b) an auto−recovery brown−out detection and c) an input to  
externally latch the circuit in case of Overvoltage Protection or Over  
Temperature Protection.  
1
1
NCP1381G = Specific Device Code  
A
WL  
Y
= Assembly Location  
= Wafer Lot  
= Year  
Features  
• Current−Mode Quasi−Resonant Operation  
• Adjustable Line Over Power Protection  
• Extremely Low Startup Current of 15 mA Maximum  
• Soft−Skip Cycle Capability at Adjustable Peak Currents  
• Plateau Sensing Overvoltage  
WW  
= Work Week  
G = Pb−Free Package  
ADJ_GTS  
1
14  
13  
12  
11  
10  
9
nc  
• Brown−Out Protection  
BO  
2
nc  
• Maximum t Limitation  
ON  
DMG  
3
Ref  
• Overpower Protection by current Sense Offset  
• Internal 5 ms Soft−Start Management  
Timer  
4
5
6
7
GTS  
Skip/OVP  
V
CC  
• Short−Circuit Protection Independent from Auxiliary Level  
• External Latch Input Pin for an OTP Signal  
• Go−To−Standby Signal for the PFC Front Stage  
• True Frequency (t + t ) Clamp Circuit  
FB  
CS  
DRV  
GND  
8
ON  
OFF  
• Low and Noiseless, No−Load Standby Power  
• Internal Leading Edge Blanking  
ORDERING INFORMATION  
See detailed ordering and shipping information in the package  
dimensions section on page 25 of this data sheet.  
• +500 mA / −800 mA Peak Current Drive Capability  
• 5 V / 10 mA Reference Voltage  
• This is a Pb−Free Device  
Typical Applications  
• High Power AC/DC Adapters for Notebooks, etc  
• Offline Battery Chargers  
• Set−Top Boxes Power Supplies, TV, Monitors, etc  
©
Semiconductor Components Industries, LLC, 2006  
1
Publication Order Number:  
July, 2006 − Rev. 3  
NCP1381/D  
1234567...26

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