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NCP1251_11

更新时间： 2024-09-18 12:10:47
品牌 Logo 应用领域
安森美 - ONSEMI 控制器
页数 文件大小 规格书
24页 275K
描述
Current-Mode PWM Controller for Off-line Power Supplies

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NCP1251_11 数据手册

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NCP1251  
Current-Mode PWM  
Controller for Off-line  
Power Supplies  
The NCP1251 is a highly integrated PWM controller capable of  
delivering a rugged and high performance offline power supply in a  
tiny TSOP−6 package. With a supply range up to 28 V, the controller  
hosts a jittered 65 kHz 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 a minimum level of 26 kHz. As the power further  
goes down, the part enters skip cycle while limiting the peak current.  
Over Power Protection (OPP) is a difficult exercise especially when  
no−load standby requirements drive the converter specifications. The  
ON proprietary integrated OPP lets you harness the maximum  
delivered power without affecting your standby performance simply  
via two external resistors. A latched Over Voltage Protection (OVP) is  
combined on the same pin. For ease of implementation, a latched OVP  
http://onsemi.com  
MARKING  
DIAGRAM  
TSOP−6  
(SOT23−6)  
SN SUFFIX  
CASE 318G  
5AxAYWG  
G
1
1
STYLE 13  
5Ax  
x
A
= Specific Device Code  
= A, 2, C, or D  
= Assembly Location  
= Year  
= Work Week  
= Pb−Free Package  
Y
W
G
also monitors the V line. They offer an efficient protection in case  
CC  
of optocoupler destruction or adverse open loop operation.  
Finally, a timer−based short−circuit protection offers the best  
protection scheme, letting you precisely select the protection trip point  
irrespective of a loose coupling between the auxiliary and the power  
windings.  
(Note: Microdot may be in either location)  
PIN CONNECTIONS  
Features  
GND  
FB  
1
2
6
5
4
DRV  
• Fixed−Frequency 65 or 100 kHz Current−Mode Control Operation  
• Internal and Adjustable Over Power Protection (OPP) Circuit  
V
CC  
• Frequency Foldback Down to 26 kHz and Skip−Cycle in Light Load  
OPP/Latch  
3
CS  
Conditions  
• Internal Ramp Compensation  
• Internal Fixed 4 ms Soft−Start  
(Top View)  
• 100 ms Timer−Based Auto−Recovery Short−Circuit Protection  
• Frequency Jittering in Normal and Frequency Foldback Modes  
• Option for Auto−Recovery or Latched Short−Circuit Protection  
• OVP Input for Improved Robustness  
ORDERING INFORMATION  
See detailed ordering and shipping information in the package  
dimensions section on page 2 of this data sheet.  
• Up to 28 V V Operation  
CC  
• Latched OVP Protection on V  
CC  
• +300 mA / −500 mA Source/Sink Drive Capability  
• Less than 100 mW Standby Power at High Line  
• EPS 2.0 Compliant  
• These are Pb−Free Devices  
Typical Applications  
• ac−dc Converters for TVs, Set−top Boxes and Printers  
• Offline Adapters for Notebooks and Netbooks  
© Semiconductor Components Industries, LLC, 2011  
1
Publication Order Number:  
October, 2011 − Rev. 7  
NCP1251/D  
1234567...24

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