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NCP1246-D

更新时间： 2024-11-07 12:27:39
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
39页 1311K
描述
Fixed Frequency Current Mode Controller for Flyback Converters

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NCP1246-D 数据手册

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NCP1246  
Fixed Frequency Current  
Mode Controller for Flyback  
Converters  
The NCP1246 is a new fixed−frequency current−mode controller  
featuring the Dynamic Self−Supply. This function greatly simplifies  
http://onsemi.com  
MARKING  
the design of the auxiliary supply and the V capacitor by activating  
CC  
the internal startup current source to supply the controller during  
start−up, transients, latch, stand−by 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 brown−out detection as well.  
It features a timer−based fault detection that ensures the detection of  
overload and an adjustable compensation to help keep the maximum  
power independent of the input voltage.  
DIAGRAM  
8
46Xff  
ALYWX  
G
SOIC−7  
CASE 751U  
1
46Xff = Specific Device Code  
X = A or B  
ff = 65 or 100  
= Assembly Location  
= Wafer Lot  
= Year  
= Work Week  
= Pb−Free Package  
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 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.  
A
L
Y
W
G
PIN CONNECTIONS  
Latch  
FB  
1
2
3
4
8
HV  
Features  
• Fixed−Frequency Current−Mode Operation (65 kHz and 100 kHz  
frequency options)  
• Frequency Foldback then Skip Mode for Maximized Performance in  
Light Load and Standby Conditions  
V
CC  
6
5
CS  
GND  
DRV  
(Top View)  
• Timer−Based Overload Protection with Latched (Option A) or  
Auto−Recovery (Option B) Operation  
ORDERING INFORMATION  
See detailed ordering and shipping information in the package  
dimensions section on page 38 of this data sheet.  
• High−voltage Current Source with Brown−Out Detection and  
Dynamic Self−Supply, Simplifying the Design of the V Circuitry  
CC  
• Frequency Modulation for Softened EMI Signature  
• Adjustable Overpower Protection Dependant on the Bulk Voltage  
• Latch−off Input Combined with the Overpower Protection Sensing  
Input  
• V Operation up to 28 V, With Overvoltage Detection  
• These Devices are Pb−Free and Halogen Free/BFR Free  
CC  
• 500/800 mA Source/Sink Drive Peak Current  
Typical Applications  
Capability  
• AC−DC Adapters for Notebooks, LCD, and Printers  
• Offline Battery Chargers  
• Consumer Electronic Power Supplies  
• Auxiliary/Housekeeping Power Supplies  
• Offline Adapters for Notebooks  
• 10 ms Soft−Start  
• Internal Thermal Shutdown  
• No−Load Standby Power < 30 mW  
• X2 Capacitor in EMI Filter Discharging Feature  
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:  
October, 2012 − Rev. 1  
NCP1246/D  
1234567...39

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