ADI公司的ADP1876是雙路輸出DC/DC同步降壓控制器,工作頻率600kHz,并集成了可驅動N-溝功率MOSFET的驅動器,輸入電壓2.75V-20V,功率級輸入電壓1V-20V,輸出電壓從0.6V到輸入電壓的90%,每路的輸出電壓大于25A,基準電壓在−40℃到 +85℃的精度為±0.85%,主要用在消費類電子,電訊基站和網絡設備以及工業和儀表.本文介紹了ADP1876主要特性,功能框圖,典型應用電路和評估板ADP1876-EVALZ主要特性,電路圖,材料清單和PCB布局圖.
The ADP1876 is a dual output dc-to-dc synchronous buck controller operating at 600 kHz fixed frequency with integrated drivers that drive N-channel power MOSFETs. An additional fixed voltage output, 150 mA linear regulator is available for powering low power loads. The device operates in current mode for improved transient response and uses valley current sensing for enhanced noise immunity. The two PWM outputs are phase shifted 180° for reducing the input current ripple and the required input capacitance.
The ADP1876 provides high speed, high peak current drive capability with dead time optimization to enable energy efficient power conversion.
ADP1876主要特性:
Wide input range: 2.75 V to 20 V
Power stage input voltage: 1 V to 20 V
Output voltage range: 0.6 V up to 90% VIN
Linear dropout (LDO) regulator with a fixed output 1.5 V at 150 mA
Output current more than 25 A per channel
180º phase shift between channels for reduced input capacitance
±0.85% reference voltage accuracy from −40℃ to +85℃
Integrated boost diodes
Independent channel precision enable
Overcurrent limit protection
Externally programmable soft start, slope compensation, and current sense gain
Thermal overload protection
Input undervoltage lockout (UVLO)
Power good with internal pull-up resistor
Available in 32-lead, 5 mm × 5 mm LFCSP
ADP1876應用:
Consumer applications
Telecommunications base station and networking
Industrial and instrumentation
圖1. ADP1876功能方框圖
圖2. ADP1876典型應用電路圖
評估板ADP1876-EVALZ
This user guide describes the design, operation, and test results of the ADP1876-EVALZ. The input range for this evaluation board is 10 V to 20 V, and the two regulated output voltages are set to 5 V (VOUT1) and 1.8 V (VOUT2) with a maximum 13 A output current. The power components, such as the MOFSETS, inductors, and bulk input and output capacitors, were chosen to yield a low system cost and good efficiency.
圖3.評估板ADP1876-EVALZ外形圖
圖4.評估板ADP1876-EVALZ電路圖
評估板ADP1876-EVALZ材料清單:
圖5.評估板ADP1876-EVALZ PCB布局圖
詳情請見:
http://www.analog.com/static/imported-files/data_sheets/ADP1876.pdf
和
http://www.analog.com/static/imported-files/user_guides/UG-334.pdf
