Powerint LCS701HG 125 W LCD TV電源解決方案(DER-270)

發布時間：2011-10-11 13:59 發布者：Liming

關鍵詞： LCD , LCS701HG , Powerint , TV , 電源

PowerInt公司的HiperLCS系列具有多功能控制器,高邊和低邊柵極驅動器,以及有兩個半橋連接的功率MOSFET的綜合LLC功率級,節省了多達30個外接元件,最大工作頻率1MHz,穩態工作頻率高達500kHz,滿負載效率高達98%,主要用在高效電源(80+銀,金和白金),LCD TV電源,LED街區和區域合作照明,打印機電源和音頻放大器電源.本文介紹了HiperLCS系列主要特性,方框圖, LCD TV和PC主電源應用電路圖, 150 W激光打印機電源以及采用LCS701HG的125 W LCD TV電源電路圖,材料清單和PCB布局圖.

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系列應用:

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

• LCD TV power supplies

• LED street and area lighting

• Printer power supplies

• Audio amplifier

圖1.HiperLCS系列方框圖

圖2.HiperLCS系列LCD TV和PC主電源應用電路圖

圖3.150 W激光打印機電源

采用LCS701HG的125 W LCD TV電源

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電源主要特性:

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

圖4.125 W LCD TV電源外形圖(頂視圖:2.97” x 5.8” (75.44 mm x 147.32 mm))
1125 W LCD TV電源指標: