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NCP1246

更新时间： 2024-11-07 11:58:47
品牌 Logo 应用领域
安森美 - ONSEMI 转换器控制器
页数 文件大小 规格书
38页 1530K
描述
Fixed Frequency Current Mode Controller for Flyback Converters

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NCP1246 数据手册

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NCP1246  
Product Preview  
Fixed Frequency Current  
Mode Controller for Flyback  
Converters  
http://onsemi.com  
MARKING  
The NCP1246 is a new fixedꢀfrequency currentꢀmode controller  
featuring the Dynamic SelfꢀSupply. This function greatly simplifies  
the design of the auxiliary supply and the V capacitor by activating  
CC  
DIAGRAM  
the internal startup current source to supply the controller during  
startꢀup, transients, latch, standꢀby etc. This device contains a special  
HV detector which detect the application unplug from the AC input  
line and triggers the X2 discharge current. This HV structure allows  
the brownꢀout detection as well.  
8
46Xff  
ALYWX  
G
SOICꢀ7  
CASE 751U  
1
It features a timerꢀbased fault detection that ensures the detection of  
overload and an adjustable compensation to help keep the maximum  
power independent of the input voltage.  
46Xff = Specific Device Code  
X = A or B  
ff = 65 or 100  
Due to frequency foldback, the controller exhibits excellent  
efficiency in light load condition while still achieving very low  
standby power consumption. Internal frequency jittering, ramp  
compensation, and a versatile latch input make this controller an  
excellent candidate for the robust power supply designs.  
A
L
Y
W
G
= Assembly Location  
= Wafer Lot  
= Year  
= Work Week  
= PbꢀFree Package  
A dedicated Off mode allows to reach the extremely low no load  
input power consumption via “sleeping” whole device and thus  
minimize the power consumption of the control circuitry.  
PIN CONNECTIONS  
Latch  
FB  
1
2
3
4
8
HV  
Features  
V
6
5
• FixedꢀFrequency CurrentꢀMode Operation (65 kHz and 100 kHz  
frequency options)  
CS  
CC  
GND  
DRV  
• Frequency Foldback then Skip Mode for Maximized Performance in  
Light Load and Standby Conditions  
(Top View)  
• TimerꢀBased Overload Protection with Latched (option A) or  
AutoꢀRecovery (Option B) Operation  
ORDERING INFORMATION  
See detailed ordering and shipping information in the package  
dimensions section on page 37 of this data sheet.  
• Highꢀvoltage Current Source with BrownꢀOut Detection and  
Dynamic SelfꢀSupply, Simplifying the Design of the V Circuitry  
CC  
• Frequency Modulation for Softened EMI Signature  
• NoꢀLoad Standby Power < 30 mW  
• Adjustable Overpower Protection Dependant on the  
• X2 Capacitor in EMI Filter Discharging Feature  
• These are PbꢀFree Devices  
Bulk Voltage  
• Latchꢀoff Input Combined with the Overpower  
Protection Sensing Input  
Typical Applications  
• ACꢀDC Adapters for Notebooks, LCD, and Printers  
• Offline Battery Chargers  
• Consumer Electronic Power Supplies  
• Auxiliary/Housekeeping Power Supplies  
• Offline Adapters for Notebooks  
• V Operation up to 28 V, With Overvoltage Detection  
CC  
• 500/800 mA Source/Sink Drive Peak Current  
Capability  
• 10 ms SoftꢀStart  
• Internal Thermal Shutdown  
This document contains information on a product under development. ON Semiconductor  
reserves the right to change or discontinue this product without notice.  
© Semiconductor Components Industries, LLC, 2012  
1
Publication Order Number:  
April, 2012 ꢀ Rev. P0  
NCP1246/D  
1234567...38

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