淺析汽車TFT-LCD顯示器升壓電源的解決方案
Maxim公司的MAX16928是高度集成的汽車TFT-LCD顯示器電源,器件集成了一個升壓轉(zhuǎn)換器(高達(dá)6W,輸出高達(dá)18V),一個1.8V/3.3V穩(wěn)壓控制器(500mA電流)和兩個柵極電壓穩(wěn)壓器,其中的正柵極電壓穩(wěn)壓器能在28V時提供20mA電流,高頻2.2MHz工作,提供軟起動和超溫關(guān)斷等功能.主要用在汽車儀表盤,汽車中心信息顯示器和汽車導(dǎo)航系統(tǒng).本文介紹了MAX16928主要特性,方框圖, 正輸出和負(fù)輸出電壓的多級電荷泵電路以及典型應(yīng)用電路.
Automotive TFT-LCD Power Supply with Boost Converter and Gate Voltage Regulators
The MAX16928 is a highly integrated power supply for automotive TFT-LCD applications. The device integrates one boost converter, one 1.8V/3.3V regulator controller, and two gate voltage regulators. The device comes in several versions to satisfy common automotive TFT-LCD power-supply requirements.
The boost converter uses spread-spectrum modulation to reduce peak interference and to optimize EMI performance.
The sequencing input (SEQ) allows flexible sequencing of the positive-gate and negative-gate voltage regulators. The power-good indicator (PGOOD) indicates a failure on any of the converters or regulator outputs. Integrated thermal shutdown circuitry protects the device from overheating.
The MAX16928 is available in a 20-pin TSSOP package with exposed pad and operates over the -40NC to +105NC temperature range.
MAX16928主要特性:
High-Power (Up to 6W) Boost Output Providing Up to 18V
1.8V or 3.3V Regulator Provides 500mA with External npn Transistor
One Positive-Gate Voltage Regulator Capable of Delivering 20mA at 28V
One Negative-Gate Voltage Regulator
High-Frequency 2.2MHz Operation
Flexible Stand-Alone Sequencing
True Shutdown™ Boost Converter
Internal Soft-Start
Overtemperature Shutdown
-40NC to +105NC Operation
AEC-Q100 Qualified
MAX16928應(yīng)用:
Automotive Dashboards
Automotive Central Information Displays
Automotive Navigation Systems
圖1.MAX16928升壓轉(zhuǎn)換器功能框圖
圖2.正輸出電壓的多級電荷泵電路
圖3.負(fù)輸出電壓的多級電荷泵電路
圖4.MAX16928應(yīng)用電路圖
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