Datasheet > ECE-A1HKG4R7

ECE-A1HKG4R7

更新时间： 2024-11-29 12:22:59

品牌	Logo	应用领域
美台 - DIODES		/
页数	文件大小	规格书
12页	552K
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High Power Factor LED Replacement T8 Fluorescent Tube

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ECE-A1HKG4R7 数据手册

AN75

High Power Factor LED Replacement T8 Fluorescent Tube

using the AL9910 High Voltage LED Controller

Yong Ang, Diodes Inc.

Introduction

This application note describes the principles and design equations required for the design of a high

brightness LED lamp using the AL9910. The equations are then used to demonstrate the design of a

universal, offline, high power factor (PF), 13W LED lamp suitable for use as the replacement for T8

fluorescent tube. A complete design including the electrical diagram, component list and performance

measurements are provided.

AL9910 high power factor buck LED driver

Figure 1 Electrical schematic of a high power factor 13W LED lamp

Figure 1 shows the electrical diagram of an offline 13W LED driver.

On the input side, CX1, CX2, CX3, CX4, L1 and L2 provide sufficient filtering for both differential mode

and common mode EMI noise which are generated by the switching converter circuit.

The rectified AC line voltage from the bridge rectifier DB1 is then fed into a passive power factor

correction or valley fill circuit which consists of 3 diodes and 2 capacitors. D1, D2, D3, C1, C2 improve

the input line current distortion in order to achieve PF greater than 0.9 for the AC line input.

The constant current regulator section consists of a buck converter driven by the AL9910. Normally,

the buck regulator is used in fixed frequency mode but its duty cycle limitation of 50% is not practical

for offline lamp. This problem can be overcome by changing the control method to a fixed off-time

operation.

The design of the internal oscillator in the AL9910 allows the IC to be configured for either fixed

frequency or fixed off-time based on how resistor R_Tis connected. For fixed off-time operation, the

resistor R_Tis connected between the Gate and R_OSCpins, as shown in Figure 1. This converter has

now a constant off-time when the power MOSFET is turned off. The on-time is based on the current

Issue 1 – January 2011

www.diodes.com

12 3 4 5 6 7...12

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与ECE-A1HKG4R7相关器件

型号	品牌	获取价格	描述	数据表
ECEA1HKG4R7B	PANASONIC	获取价格	Aluminum Electrolytic Capacitor, Polarized, Aluminum, 50V, 20% +Tol, 20% -Tol, 4.7uF, Thro
ECEA1HKGR15	PANASONIC	获取价格	CAPACITOR, ALUMINUM ELECTROLYTIC, NON SOLID, POLARIZED, 50V, 0.15uF, THROUGH HOLE MOUNT, R
ECEA1HKGR47	PANASONIC	获取价格	CAPACITOR, ALUMINUM ELECTROLYTIC, NON SOLID, POLARIZED, 50V, 0.47uF, THROUGH HOLE MOUNT, R
ECEA1HKK010B	PANASONIC	获取价格	Aluminum Electrolytic Capacitors/ KS Radial Lead Type Series: KS Type : A
ECEA1HKK010I	PANASONIC	获取价格	Aluminum Electrolytic Capacitors/ KS Radial Lead Type Series: KS Type : A
ECEA1HKK0R1B	PANASONIC	获取价格	Aluminum Electrolytic Capacitors/ KS Radial Lead Type Series: KS Type : A
ECEA1HKK0R1I	PANASONIC	获取价格	Aluminum Electrolytic Capacitors/ KS Radial Lead Type Series: KS Type : A
ECEA1HKKR22B	PANASONIC	获取价格	Aluminum Electrolytic Capacitors/ KS Radial Lead Type Series: KS Type : A
ECEA1HKKR22I	PANASONIC	获取价格	Aluminum Electrolytic Capacitors/ KS Radial Lead Type Series: KS Type : A
ECEA1HKKR33B	PANASONIC	获取价格	Aluminum Electrolytic Capacitors/ KS Radial Lead Type Series: KS Type : A

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