Powerint LCS702HG 150W电源参考设计(RDR239)

发布时间：2011-10-19 17:52 发布者：1046235000

Powerint公司的HiperLCS系列LCS702HG集成了多功能控制器,高边和低边栅极驱动器,以及半桥配置的两个功率MOSFET,可节省30多个外接元件,工作频率高达1MHz,20%,50%和100%负载点的平均效率为95%,主要用在高效电源(80PLUS 银,金和白金),LCD TV电源和LED街区和区域照明.本文介绍了HiperLCS系列主要特性,方框图, 150 W 激光打印机电源图以及采用HiperLCSTM LCS702HG的150W LLC高压DC/DC谐振转换器参考设计主要特性,电路图,材料清单和PCB布局图.

The HiperLCS is an integrated LLC power stage incorporating a multi-function controller, high-side and low-side gate drivers, plus two power MOSFETs in a half-bridge configuration.

The variable frequency controller provides high efficiency by switching the power MOSFETs at zero voltage (ZVS), eliminating switching losses.

HiperLCS系列主要特性:

• LLC half-bridge power stage incorporating controller, high and low-side gate drives, and high-voltage power MOSFETs

• Eliminates up to 30 external components

• High maximum operating frequency of 1 MHz

• Nominal steady-state operation up to 500 kHz

• Dramatically reduces magnetics size and allows use of SMD ceramic output capacitors

• Precise duty symmetry balances output rectifier current, improving efficiency

• 50% ±0.3% typical at 300 kHz

• Comprehensive fault handling and current limiting

• Programmable brown-in/out thresholds and hysteresis

• Undervoltage (UV) and overvoltage (OV) protection

• Programmable over-current protection (OCP)

• Short-circuit protection (SCP)

• Over-temperature protection (OTP)

• Programmable dead-time for optimized design

• Programmable burst mode maintains regulation at no-load and improves light load efficiency

• Programmable soft-start time and delay before soft-start

• Accurate programmable minimum and maximum frequency limits

• Single package designed for high-power and high-frequency

• Reduces assembly cost and reduces PCB layout loop areas

• Simple single clip attachment to heat sink

• Exposed thermal pad connected to ground potential – no insulators required between package and heat sink

• Staggered pin arrangement for simple PC board routing and high-voltage creepage requirements

• Paired with HiperPFS PFC product gives complete, high efficiency, low part count PSU solutions

HiperLCS系列应用:

• High-efficiency power supplies (80 PLUS Silver, Gold and Platinum)

• LCD TV power supplies

• LED street and area lighting

• Printer power supplies

• Audio amplifier

图1. HiperLCS系列方框图

图2.150 W 激光打印机电源

采用HiperLCSTM LCS702HG的150W LLC高压DC/DC谐振转换器参考设计

This document is an engineering report describing a 24 V, 150 W LLC DC-DC converter utilizing a LCS702HG integrated LLC power stage IC. The report and board is intended as a general purpose test platform to demonstrate operation and capabilities of the HiperLCS family of devices.

The design operates from an input voltage range of 300 V to 420 V DC and requires an auxiliary supply of 12 V. The high-voltage DC input in a typical system would be supplied from a PFC stage and the 12 V from system bias or standby supply.

150W电源参考设计主要特性:

 Low parts count, low cost, simple resonant (LLC) converter

 Integration of controller, high-side and low-side MOSFETS and drivers reduces

component count and design effort

 High operating frequency (250 kHz)

 Reduces transformer core size (EEL25) and size of converter

 Enables ceramic in place of electrolytic output capacitors

 High-efficiency

 >95% efficiency at full load

 >95% average efficiency (20%, 50%, 100% load points)

 Capacitive current sense for low power dissipation

 Burst mode ensures no-load regulation