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NCP1248AD065R2G

更新时间： 2024-11-09 01:12:43
品牌 Logo 应用领域
安森美 - ONSEMI /
页数 文件大小 规格书
36页 1213K
描述
Fixed Frequency Current Mode Controller

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NCP1248AD065R2G 数据手册

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NCP1248  
Fixed Frequency Current  
Mode Controller for Flyback  
Converters  
The NCP1248 is a new fixed-frequency current-mode controller  
featuring the Dynamic Self-Supply. This function greatly simplifies  
http://onsemi.com  
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.  
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.  
SOIC−7  
CASE 751U  
MARKING DIAGRAM  
8
48Axxx  
ALYWX  
G
1
48Axxx = Specific Device Code  
xxx = 065 for 65 kHz  
= 100 for 100 kHz  
= Assembly Location  
= Wafer Lot  
A
L
Y
W
G
= Year  
= Work Week  
= Pb-Free Package  
Features  
• Fixed-Frequency Current-Mode Operation using 65 kHz/100 kHz  
Switching Frequency  
PIN CONNECTIONS  
• Frequency Foldback then Skip Mode for Maximized Performance  
in Light Load and Standby Conditions  
• Timer-Based Overload Protection with Latched (Option A)  
Operation  
1
2
3
4
8
Latch  
HV  
FB  
CS  
6
5
• High-voltage Current Source with Brown-Out Detection and  
V
CC  
Dynamic Self-Supply, Simplifying the Design of the V  
Circuitry  
CC  
GND  
DRV  
(Top View)  
• Frequency Modulation for Softened EMI Signature  
• Adjustable Overpower Protection Dependant on the Bulk Voltage  
ORDERING INFORMATION  
See detailed ordering and shipping information on page 35 of  
• Latch-off Input Combined with the Overpower Protection  
Sensing Input  
this data sheet.  
• V Operation up to 28 V, With Overvoltage Detection  
CC  
Typical Applications  
• 500/800 mA Source/Sink Drive Peak Current Capability  
• 10 ms Soft-Start  
• AC-DC Adapters for Notebooks, LCD, and Printers  
• Offline Battery Chargers  
• Consumer Electronic Power Supplies  
• Auxiliary/Housekeeping Power Supplies  
• Offline Adapters for Notebooks  
• Internal Thermal Shutdown  
• No-Load Standby Power < 30 mW  
• X2 Capacitor in EMI Filter Discharging Feature  
• These Devices are Pb-Free and Halogen Free/BFR Free  
© Semiconductor Components Industries, LLC, 2014  
1
Publication Order Number:  
December, 2014 − Rev. 0  
NCP1248/D  
1234567...36

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