PI:LCS701HG 125 W LCD TV电源解决方案(DER-270)
摘要: 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.
PI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:
Low Profile Design
11 mm height idea for low profile LCD TV designs
Low part count solution
Integration of controller, drivers and MOSFET half bridge in a single HiperLCS IC
dramatically reduces component count and complexity
High Operating Frequency (190 kHz)
Enabled use of ceramic output capacitors
Enabled use of low profile EFD35 core size
High Performance
>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))
1125 W LCD TV电源指标:
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:
图7.125 W LCD TV电源PCB布局图(顶层)(尺寸为密尔)
图8.125 W LCD TV电源PCB布局图(底层)
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