OnSemiNCP1611160WPFC电源解决方案

On Semi公司的NCP1611是采用创新的电流控制频率折返(CCFF)方法的驱动PFC升压级,功率因素接近1, 高驱动能力为 500 mA / +800 mA, VCC范围从9.5V到35V,具有非闭锁和过压保护,电压检测,软起动和过流限制,主要用在PC电源,需要PFC的所有离线电器电源.本文介绍了NCP1611主要特性,方框图,通用应用电路以及160W PFC电源评估板指标,电路图和材料清单.

The NCP1611 is designed to drive PFC boost stages based on an innovative Current Controlled Frequency Fold back (CCFF) method. In this mode, the circuit classically operates in Critical conduction Mode (CrM) when the inductor current exceeds a programmable value. When the current is below this preset level, the NCP1611 linearly decays the frequency down to about 20 kHz when the current is null. CCFF maximizes the efficiency at both nominal and light load. In particular, the standby losses are reduced to a minimum.

Like in FCCrM controllers, internal circuitry allows near unity power factor even when the switching frequency is reduced. Housed in a SO 8 package, the circuit also incorporates the features necessary for robust and compact PFC stages, with few external components.

NCP1611主要特性:

Near Unity Power Factor

Critical Conduction Mode (CrM)

Current Controlled Frequency Fold back (CCFF): Low Frequency Operation is Forced at Low Current Levels

On time Modulation to Maintain a Proper Current Shaping in CCFF Mode

Skip Mode Near the Line Zero Crossing

Fast Line / Load Transient Compensation (Dynamic Response Enhancer)

Valley Turn on

High Drive Capability: 500 mA / +800 mA

VCC Range: from 9.5 V to 35 V

Low Start up Consumption

A Version: Low VCC Start up Level (10.5 V), B Version: High VCC Start up level (17.0 V)

Line Range Detection

This is a Pb Free Device

NCP1611安全特性:

Non latching, Over Voltage Protection

Brown Out Detection

Soft Start for Smooth Start up Operation (A version)

Over Current Limitation

Disable Protection if the Feedback Pin is Not Connected

Thermal Shutdown

Low Duty Cycle Operation if the Bypass Diode is Shorted

Open Ground Pin Fault Monitoring

NCP1611典型应用:

PC Power Supplies

All Off Line Appliances Requiring Power Factor Correction

图1.NCP1611方框图

图2.NCP1611通用应用电路图

160W电源评估板

The NCP1611 is active power factor corrected (PFC) controller specifically designed for use as a boost preconverter in ac-dc adapters, flat TVs, lighting ballasts and other medium powered offline applications. The controller is based on an innovative Current Controlled Frequency Foldback(CCFF) method. In this mode, the circuit classically operates in Critical conduction Mode (CrM) when the inductor current exceeds a programmable value. When the current is below this preset level, the NCP1611 linearly reduces the frequency down to about 20 kHz when the current is at a null. CCFF maximizes the efficiency at both nominal and light load. In particular, the standby losses are reduced to a minimum. The controller features a robust suite of protection features to properly handle an array of power supply operating and fault conditions.


图3.160W电源评估板外形图

160W电源评估板指标:


图4.160W电源评估板电路图:电源部分

图5.160W电源评估板电路图:控制部分
160W电源评估板材料清单:

详情请见:
http://www.onsemi.cn/pub_link/Collateral/NCP1611-D.PDF
和
http://www.onsemi.cn/pub_link/Collateral/AND9062-D.PDF
以及
http://www.onsemi.cn/pub_link/Collateral/NCP1611GEVB_BOM_ROHS.PDF