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NCP1280_05

更新时间： 2024-09-18 04:11:35
品牌 Logo 应用领域
安森美 - ONSEMI 控制器
页数 文件大小 规格书
18页 133K
描述
Active Clamp Voltage Mode PWM Controller for Off-Line Applications

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NCP1280_05 数据手册

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NCP1280  
Active Clamp Voltage Mode  
PWM Controller for Off−Line  
Applications  
The NCP1280 provides a highly integrated solution for off−line  
power supplies requiring high−efficiency and low parts count. This  
voltage mode controller provides control outputs for driving a forward  
converter primary MOSFET and an auxiliary MOSFET for active  
clamp circuit. The second output with its programmable delay can also  
be used for driving a synchronous rectifier on the secondary or for  
asymmetric half bridge circuits. Incorporation of high voltage startup  
circuitry (with 700 V capability) reduces parts count and system  
power dissipation. Additional features such as line UV/OV protection,  
soft−start, single resistor programmable (high) frequency oscillator,  
line voltage feedforward, dual mode overcurrent protection and  
maximum duty cycle control, allow converter optimization at minimal  
cost. Compared to a traditional forward converter, an NCP1280 based  
converter can offer significant efficiency improvements and system  
cost savings.  
http://onsemi.com  
MARKING  
DIAGRAM  
16  
SO−16  
D SUFFIX  
CASE 751B  
NCP1280  
AWLYWW  
16  
1
1
NCP1280= Device Code  
A
= Assembly Location  
WL  
Y
= Wafer Lot  
= Year  
WW  
= Work Week  
Features  
• Internal High Voltage Startup Regulator (25 V to 700 V)  
• Dual Control Outputs with Adjustable Overlap Delay  
• Programmable Maximum Duty Cycle Control  
• Single Resistor Oscillator Frequency Setting  
• Fast Line Feedforward  
PIN CONNECTIONS  
1
16  
V
in  
V
AUX  
NC  
UV/OV  
FF  
OUT1  
GND  
OUT2  
CS  
t
D
• Line Under/Overvoltage Lockout  
• Dual Mode Overcurrent Protection  
• Programmable Soft−Start  
C
V
V
SS  
SKIP  
REF  
R
T
EA  
DC  
MAX  
• Precision 5.0 V Reference  
• Pb−Free Package is Available*  
Typical Applications  
ORDERING INFORMATION  
See detailed ordering and shipping information in the package  
dimensions section on page 4 of this data sheet.  
• Off−Line Power Converters in 100−500 W Range  
• Desktop Power Supplies (High−End)  
• Industrial Power Supplies  
*For additional information on our Pb−Free strategy  
and soldering details, please download the  
ON Semiconductor Soldering and Mounting  
Techniques Reference Manual, SOLDERRM/D.  
• Plasma/LCD TV Front−End  
L
out  
TX1  
Startup  
C
clamp  
+
M3  
Feedforward  
+
SR Drive  
V
in  
C
V
−
M
clamp  
out  
out  
−
V
in  
FF  
NCP1280  
OUT2  
OUT1  
UV/OV  
Driver  
M1  
M2  
t
D
Overlap  
Delay  
Error  
Amplifier  
Opto  
Figure 1. Forward Converter for Off−line Applications Using PFC Inputs  
Semiconductor Components Industries, LLC, 2005  
1
Publication Order Number  
February, 2005 − Rev. 3  
NCP1280/D  
1234567...18

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