[原创] ADI AD8452电池测试精密模拟前端解决方案

ADI公司的AD8452是用于电池测试和形成系统的精密模拟前端,在单片内组成了模拟前端控制器和开关电源(SMPS)以及PWM,其精密仪表放大器测量电池充电/放电电流精度优于±0.1%,电池电压精度也优于±0.1%.主要用在电池形成和测试,高效率电池测试系统和电池调理(充电和放电)系统.本文介绍了AD845主要特性,详细框图和功能框图,应用电路,以及评估板AD8452-EVALZ主要特性,框图,电路图,材料清单和PCB设计图.

The AD8452 combines a precision analog front-end controllerand switch mode power supply (SMPS), pulse-width modulator(PWM) driver into a single silicon platform for high volumebattery testing and formation manufacturing. A precisioninstrumentation amplifier (in-amp) measures the battery charge/discharge current to better than ±0.1% accuracy, while an equallyaccurate difference amplifier measures the battery voltage.

Internal laser trimmed resistor networks establish the in-ampand difference amplifier gains (66 V/V and 0.4 V/V, respectively),and stabilize the AD8452 performance across the ratedoperating temperature range.

Desired battery cycling current and voltage levels are establishedby applying precise control voltages to the ISET and VSETinputs. Actual charge and discharge current levels are sensed(usually by a high power, highly accurate shunt resistor) whosevalue is carefully selected according to system parameters.
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