Analogi AAT1185降压电源方案
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Analogic 公司的AAT1185是单输出降压稳压电源控制器,输出电压从6V到24V,输出电压从0.8V到5.5V. AAT1185提供高边和低边引脚,用来驱动外接的N沟MOSFET.输出电流从小于1A到10A,主要用在DSL和线缆调制解调器,笔记本电脑,卫星电视机顶盒(STB)和无线LAN系统.本文介绍了AAT1185的主要特性,方框图,典型应用电路以及AAT1185TO评估板电路图.
The AAT1185 is a single output step-down (Buck) regulator controller with an input range of 6V to 24V. The output range is adjustable from 0.8V to 5.5V. The device provides high and low-side pins to drive external n-channel MOSFETs; allowing fully synchronous operation for maximum efficiency and performance.
Alternately, the low-side MOSFET may be replaced with a Schottky rectifier. Both high and low-side drive pins are compatible with a wide range of external MOSFETs making the device the ideal control solution for low power and high power configurations.
Voltage mode control allows for optimum performance across the entire output voltage and load range. The 490kHz fixed switching frequency allows wide range of L/C filtering components, achieving smallest size and maximum efficiency. External compensation allows the designer to optimize the transient response.
The controller includes programmable over-current, integrated soft-start and over-temperature protection.
The AAT1185 is available in the Pb-free, 14-pin TSOPJW package. The rated operating temperature range is -40°C to 85°C.
AAT1185主要特性:
VIN = 6.0V to 24.0V
VOUT Adjustable from 0.8V to 5.5V
IOUT from <1A up to 10A
Small Solution Size
Ultra-small External L/C
Synchronous or Non-Synchronous
Shutdown Current <30μA
High Switching Frequency
Voltage Mode Control
PWM Fixed Frequency for Lowest Noise
Programmable Over-Current Protection
Over-Temperature Protection
Internal Soft Start
2.85x3mm TSOPJW-14 Package
-40°C to 85°C Temperature Range
AAT1185应用:
DSL and Cable Modems
Notebook Computers
Satellite Set Top Boxes
Wireless LAN Systems
图1.AAT1185方框图
图2.AAT1185典型应用电路图
图3.AAT1185TO评估板电路图(VIN = 6V-24V和 VOUT = 3.3V.)
本文关键字：电源 电子技术，电工技术 - 电子技术
