On Semi NCP1631 300W SLIM LCD TV电源解决方案

On Semi公司的NCP1631是2相功率因素控制器,功率因素接近1,在所有条件下具有180度的相移,具有精确的零电流检测和快速线路/负载变化补偿,驱动能力−500mA/+800 mA,主要用在计算机电源,LCD/等离子平板电视以及所有需要PFC的离线电源.本文介绍了NCP1631主要特性和安全特性,功能方框图,典型应用电路以及300W SLIM LCD TV电源参考设计考卷和方框图,电路图与材料清单.
The NCP1631 integrates a dual MOSFET driver for interleaved PFC applications. Interleaving consists of paralleling two small stages in lieu of a bigger one, more difficult to design. This approach has several merits like the ease of implementation, the use of smaller components or a better distribution of the heating.
Also, Interleaving extends the power range of Critical Conduction Mode that is an efficient and cost−effective technique (no need for low trr diodes). In addition, the NCP1631 drivers are 180phase shift for a significantly reduced current ripple.
Housed in a SOIC16 package, the circuit incorporates all the features necessary for building robust and compact interleaved PFC stages, with a minimum of external components.
NCP1631主要特性:
Near−Unity Power Factor
Substantial 180 Phase Shift in All Conditions Including Transient Phases
Frequency Clamped Critical Conduction Mode (FCCrM)i.e.Fixed Frequency, Discontinuous Conduction Mode Operation with Critical Conduction Achievable in Most Stressful Conditions
FCCrM Operation Optimizes the PFC Stage Efficiency Over the Load Range
Out−of−phase Control for Low EMI and a Reduced rms Current in the Bulk Capacitor
Frequency Fold−back at Low Power to Further Improve the Light Load Efficiency
Accurate Zero Current Detection by Auxiliary Winding for Valley Turn On
Fast Line / Load Transient Compensation
High Drive Capability: −500 mA / +800 mA
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