原标题：Powerint LCS701HG 125 W LCD TV电源解决方案(DER-270)

　　powerint公司的HiperLCS系列具有多功能控制器, 高边和低边栅极驱动器,以及有两个半桥连接的功率MOSFET的综合LLC功率级,节省了多达30个外接元件,最大工作频率1MHz,稳态工作频率高达 500kHz,满负载效率高达98%,主要用在高效电源(80+银,金和白金),LCD TV电源,LED街区和区域合作照明,打印机电源和音频放大器电源.本文介绍了HiperLCS系列主要特性,方框图, LCD TV和PC主电源应用电路图, 150 W激光打印机电源以及采用LCS701HG的125 W LCD TV电源电路图,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. Figure 1 shows a simplified schematic of a HiperLCS based power stage where the LLC resonant inductor is integrated into the transformer.

　　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.HiperLCS系列LCD TV和PC主电源应用电路图

　　图3.150 W激光打印机电源

　　采用LCS701HG的125 W LCD TV电源

　　125 W LLC DC-DC Resonant Converter Using HiperLCSTM LCS701HG

　　This document is an engineering report describing a 12 V and 24 V, 125 W LLC DC-DC converter utilizing a LCS701HG integrated LLC power stage IC. This power supply is intended as for use in an LCD TV with LED back lighting. The board requires 12 VDC and 380 VDC inputs.

　　The document contains the power supply specification, schematic, bill of materials, transformer documentation, printed circuit layout, and performance data.

　　125 W LCD TV电源主要特性:

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　　Low Profile Design

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　　11 mm height idea for low profile LCD TV designs

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　　Low part count solution

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　　Integration of controller, drivers and MOSFET half bridge in a single HiperLCS IC

　　dramatically reduces component count and complexity

　　

　　High Operating Frequency (190 kHz)

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　　Enabled use of ceramic output capacitors

　　

　　Enabled use of low profile EFD35 core size

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　　High Performance

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　　>94% full load efficiency

　　

　　Excellent output cross regulation

　　Lossless capacitive current sense for reduced losses

　　Burst mode ensures regulation under no-load condition

　　图4.125 W LCD TV电源外形图(顶视图:2.97” x 5.8” (75.44 mm x 147.32 mm))

　　图5.125 W LCD TV电源电路图

　　125 W LCD TV电源材料清单(BOM):

　　图6.电源变压器电路图

　　电源变压器主要指标: