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NCP1377P

更新时间： 2024-11-28 22:54:31
品牌 Logo 应用领域
安森美 - ONSEMI 控制器
页数 文件大小 规格书
16页 169K
描述
PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation

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NCP1377P 数据手册

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NCP1377, NCP1377B  
PWM Current−Mode  
Controller for Free−Running  
Quasi−Resonant Operation  
The NCP1377 combines a true current mode modulator and a  
demagnetization detector which ensures full borderline/critical  
Conduction Mode in any load/line conditions together with  
minimum drain voltage switching (Quasi−Resonant operation). Due  
to its inherent skip cycle capability, the controller enters burst mode  
as soon as the power demand falls below a predetermined level. As  
this happens at low peak current, no audible noise can be heard. For  
NCP1377, an internal 8.0 ms timer prevents the free−run frequency to  
exceed 100 kHz (therefore below the 150 kHz CISPR−22 EMI  
starting limit), while the skip adjustment capability lets the user  
select the frequency at which the burst foldback takes place. For  
NC1377B, the internal timer duration is reduced to 3.0 ms to allow  
operation at higher frequencies (up to 300 kHz).  
http://onsemi.com  
MARKING DIAGRAMS  
SOIC−8  
D SUFFIX  
CASE 751  
8
1
8
1
1377  
ALYW  
1377B  
ALYW  
8
1
PDIP−7  
P SUFFIX  
CASE 626B  
The transformer core reset detection is done through an auxiliary  
winding which, brought via a dedicated pin, also enables fast  
Over Voltage Protection (OVP). Once an OVP has been detected, the  
IC permanently latches off. The 1377 features a sampling time of  
4.5 ms whereas it is 1.5 ms for the B version.  
1377P  
AWL  
1377BP  
AWL  
YYWW  
YYWW  
The NCP1377 also features an efficient protective circuitries  
which, in presence of an overcurrent condition, disables the output  
pulses and enters a safe burst mode, trying to restart. Once the default  
has gone, the device auto−recovers. Finally an internal 1.0 ms  
Soft−Start eliminates the traditional startup stress.  
1
1
8
1
A
= Assembly Location  
WL, L = Wafer Lot  
YY, Y = Year  
WW, W = Work Week  
Features  
PIN CONNECTIONS  
• Pb−Free Package is Available  
• Free−Running Borderline/Critical Mode Quasi−Resonant Operation  
• Latched Overvoltage Protection  
• Auto−Recovery Short−Circuit Protection Via UVLO Crossover  
• External Latch Triggering, e.g. Via Overtemperature Signal  
• Current−Mode with Adjustable Skip Cycle Capability  
• Internal 1.0 ms Soft−Start  
Dmg  
HV  
1
2
3
4
8
FB  
CS  
V
CC  
6
5
GND  
Drv  
(Top View)  
• Internal Temperature Shutdown  
• Internal Leading Edge Blanking  
ORDERING INFORMATION  
• 500 mA Peak Current Source/Sink Capability  
• Under Voltage Lockout Level of 12.5 V (On) and 7.5 V (Min)  
• Direct Optocoupler Connection  
†
Device  
Package  
Shipping  
NCP1377DR2  
SOIC−8  
2500 Tape & Reel  
2500 Tape & Reel  
NCP1377DR2G  
SOIC−8  
(Pb−Free)  
• SPICE Models Available for TRANsient Analysis  
• Internal Minimum T  
OFF  
NCP1377BDR2  
NCP1377P  
SOIC−8  
PDIP−7  
PDIP−7  
2500 Tape & Reel  
50 Units/Tube  
50 Units/Tube  
Typical Applications  
NCP1377BP  
• AC−DC Adapters for Notebooks, etc.  
• Offline Battery Chargers  
• Consumer Electronics (DVD Players, Set−Top Boxes, TVs, etc.)  
• Auxiliary Power Supplies (USB, Appliances, TVs, etc.)  
†For information on tape and reel specifications,  
including part orientation and tape sizes, please  
refer to our Tape and Reel Packaging Specifications  
Brochure, BRD8011/D.  
Semiconductor Components Industries, LLC, 2004  
1
Publication Order Number:  
October, 2004 − Rev. 1  
NCP1377/D  
1234567...16

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NCP1377P 替代型号

型号 品牌 替代类型 描述 数据表
NCP1378P ONSEMI

完全替代

 PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation
NCP1377PG ONSEMI

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NCP1378PG ONSEMI

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