LM5046

更新时间： 2024-11-29 11:36:39

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
4页	581K
描述
Based Eighth Brick Reference Board Input operating range: 36V to 75V

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National Semiconductor

Application Note 2126

Ajay Hari

LM5046 Based Eighth Brick

Reference Board

March 4, 2011

Introduction

Theory of Operation

The LM5046 reference board is designed based on the

phase-shifted full-bridge topology. This board is for reference

only and is intended to demonstrate the capability of the

LM5046. Hardware is not provided for evaluation. Please re-

fer to AN2115 for LM5046 evaluation board. The reference

board is in an industry standard eighth brick footprint.

The Phase-Shifted Full-Bridge (PSFB) topology is a deriva-

tive of the classic full-bridge topology. When tuned appropri-

ately the PSFB topology achieves zero voltage switching

(ZVS) of the primary FETs while maintaining constant switch-

ing frequency. The ZVS feature is highly desirable as it re-

duces both the switching losses and EMI emissions. Figure 1

illustrates the circuit arrangement for the PSFB topology. The

power transfer mode of the PSFB topology is similar to the

hard switching full-bridge i.e., when the FETs in the diagonal

of the bridge are turned-on (Q1 & Q3 or Q2 & Q4), it initiates

a power transfer cycle. At the end of the power transfer cycle,

PWM turns off the switch Q3 or Q4 depending on the phase

with a pulse width determined by the input and output voltages

and the transformer turns ratio. In the freewheel mode, unlike

the classic full-bridge where all the four primary FETs are off,

in the PSFB topology the primary of the power transformer is

shorted by activating either both the top FETs (Q1 and Q4) or

both the bottom FETs (Q2 and Q3) alternatively. In a PSFB

topology, the primary switches are turned on alternatively en-

ergizing the windings in such a way that the flux swings back

and forth in the first and the third quadrants of the B-H curve.

The use of two quadrants allows better utilization of the core

resulting in a smaller core volume compared to the single-

ended topologies. Further, the ZVS of the primary FETs re-

sults in low EMI compared to the conventional hard-switching

full-bridge topology.

The performance of the evaluation board is as follows:

•

Input operating range: 36V to 75V

Output voltage: 12V

Measured efficiency at 48V: 92% @ 10A

Frequency of operation: 420kHz

Board size: 2.28 x 0.89 x 0.4 inches

Load Regulation: 0.2%

Line Regulation: 0.1%

Line UVLO (34V/32V on/off)

Hiccup Mode Current Limit

The printed circuit board consists of 10 layers; 2 ounce copper

outer layers and 3 ounce copper inner layers on FR4 material

with a total thickness of 0.12 inches. The unit is designed for

continuous operation at rated load at <40°C and a minimum

airflow of 200 CFM.

A schematic for the reference board is shown on Page 3. Bill

of Materials and gerber files will be uploaded shortly.

30152401

Simplified Full-Bridge Converter

301524

www.national.com

12 3 4

中文翻译

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与LM5046相关器件

型号	品牌	获取价格	描述	数据表
LM5046_1	NSC	获取价格	Input operating range: 36V to 75V Line UVLO (34V/32V on/off)
LM5046_14	TI	获取价格	Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers
LM5046MH	TI	获取价格	LM5046 Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers
LM5046MH/NOPB	TI	获取价格	LM5046 Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers
LM5046MHX	TI	获取价格	LM5046 Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers
LM5046MHX/NOPB	TI	获取价格	LM5046 Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers
LM5046SQ	TI	获取价格	LM5046 Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers
LM5046SQ/NOPB	TI	获取价格	LM5046 Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers
LM5046SQX	TI	获取价格	LM5046 Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers
LM5046SQX/NOPB	TI	获取价格	LM5046 Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers

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