原标题：NXP TEA1752T 90W笔记本电脑适配器设计方案

　　nxp 公司的GreenChip III TEA1752T和TEA1752LT是第三代开关电源(SMPS)控制器，组合了功率因素修正(PFC)和反激控制器，通用火线电压从70VAC到276VAC，高度集成方便了设计，减少了外部元件数量，电源功率高达250W。本文介绍了TEA1752T和TEA1752LT主要特性和优势，方框图和典型应用框图，以及采用TEA1752T/52LT的90W笔记本电脑适配器主要特性，电路图和所用材料清单(BOM)。

　　The GreenChip III is the third generation of green Switched Mode Power Supply (SMPS)controller ICs. The TEA1752T and TEA1752LT combine a controller for Power Factor Correction (PFC) and a flyback controller. The high level of integration facilitates the design of a cost-effective power supply using a minimum number of external components.

　　The special built-in green functions provide high efficiency at all power levels. This applies to quasi-resonant operation at high power levels, quasi-resonant operation with valley skipping and reduced frequency operation at lower power levels. At low power levels, the PFC switches off to maintain high efficiency.

　　During low power conditions, the flyback controller switches to frequency reduction mode and limits the peak current to an adjustable minimum value. This will ensure high efficiency at low power and good standby power performance while minimizing audible noise from the transformer.

　　The TEA1752(L)T is a MultiChip Module (MCM), containing two chips. The proprietary high voltage BCD800 process which enables direct start-up from the rectified universal mains voltage in an effective and green way and a low voltage Silicon-On Insulator (SOI)which provides accurate, high speed protection functions and control.

　　The TEA1752(L)T enables highly efficient and reliable supplies with power requirements of up to 250 W to be designed easily and with a minimum number of external components.

　　TEA1752T和TEA1752LT主要特性与优势：

　　Distinctive features

　　Integrated PFC and flyback controller

　　Universal mains supply operation (70 V (AC) to 276 V (AC))

　　Dual boost PFC with accurate maximum output voltage (NXP Semiconductors patented, US patent number: US7575280)

　　High level of integration, resulting in a very low external component count and a cost-effective design

　　Adjustable PFC switch-off delay

　　Green features

　　On-chip start-up current source

　　PFC green features

　　Valley/zero voltage switching for minimum switching losses(NXP Semiconductors patented, US patent number: US6256210)

　　Frequency limitation to reduce switching losses

　　PFC is switched off when a low load is detected at the flyback output

　　Flyback green features

　　Valley switching for minimum switching losses (NXP Semiconductors patented, US patent number: US6256210)

　　Frequency reduction with fixed minimum peak current at low power operation to maintain high-efficiency at low output power levels

　　Protection features

　　Safe restart mode for system fault conditions

　　Continuous mode protection by means of demagnetization detection for both converters (NXP Semiconductors patented, patent number: US5032967)

　　UnderVoltage Protection (UVP) (foldback during overload)

　　Accurate OverVoltage Protection (OVP) for PFC

　　Accurate, adjustable OverVoltage Protection (OVP) for flyback converter (NXP Semiconductors patented, patent number: US6542386)

　　Mains voltage independent OverPower Protection (OPP) (NXP Semiconductors patented, patent number: US6542386)

　　Open control loop protection for both converters. The open-loop protection on the flyback converter is latched on the TEA1752LT and safe restart on the TEA1752T

　　IC overtemperature protection

　　Low and adjustable OverCurrent Protection (OCP) trip level for both converters

　　General purpose input for latched protection, e.g. to be used for system OverTemperature Protection (OTP)

　　TEA1752T和TEA1752LT应用：

　　All applications requiring efficient and cost-effective power supply solutions to 250 W.Notebook adapters in particular can benefit from the high level of integration

　　图1。TEA1752T/52LT方框图

　　图2。TEA1752T/52LT反激电路软起动框图

　　图3。TEA1752T/52LT PFC软起动框图

　　图4。TEA1752T/52LT典型应用框图

　　采用TEA1752T/52LT的90W笔记本电脑适配器

　　90 Watt notebook adapter with TEA1752T and TEA1791T

　　技术指标：

　　• Mains input voltage: 90 V to 264 V; 47 Hz to 63 Hz

　　• DC output: 19.5 V; ±2 %

　　• Maximum continuous output current: 4.62 A

　　• Peak output current: ≥ 5.7 A

　　• Efficiency: > 88.5 % at maximum load

　　• ENERGY STAR active mode efficiency: > 89.5 %

　　• No load power consumption: ≤ 0.2 W

　　• Dynamic load response (peak-to-peak): 700 mV

　　• Output ripple and noise (peak-to-peak): 100 mV

　　• CISPR22 class B conducted EMI (−15 dB margin)

　　• EN61000-4-2 immunity against ESD (≥ ±12 kV air discharge)

　　• EN61000-3-2 A14 (harmonics) compliance

　　• Short Circuit Protection (SCP); input power < 1.2 W during SCP test

　　• OverCurrent Protection (OCP); input power < 2.2 W during OCP test

　　• Latched output OverVoltage Protection (OVP): < 24 V

　　• Latched OverTemperature Protection (OTP); ≤ 120℃

　　• Fast Latch Reset (FLR): < 2 s

　　图5。90W笔记本电脑适配器外形图

　　图6。90W笔记本电脑适配器电路图

　　90W笔记本电脑适配器材料清单(BOM)：

　　Flyback transformer T1 specifications

　　• Primary inductance: 450 μH (±5 %)

　　• Leakage inductance: 6 μH (max)

　　• Core/bobbin: PQ3220

　　• Core material: PC44

　　• HI-POT primary - secondary: 3 kV; 5 mA; 3 s