ADP1882-3設(shè)計的同步降壓電源控制方案
本文介紹了ADP1882/ADP1883主要特性,方框圖,典型應(yīng)用電圖,大電流評估板電路圖和PCB布局圖以及15A,20A輸出等多種應(yīng)用電路。ADI 公司的ADP1882/ADP1883是電流模式同步降壓電源控制器,具有優(yōu)異的瞬態(tài)響應(yīng),最佳的穩(wěn)定性以及限流保護(hù),可驅(qū)多個N溝功率級,降低輸出電壓低至0.8V。電源輸入電壓2.75V-20V,偏壓電源為2.75V-5.5V,0.8V基準(zhǔn)電壓有±1.0%精度,工作頻率可選擇為300kHz,600kHz和1.0MHz,主要用在通信和網(wǎng)絡(luò)設(shè)備,中高端服務(wù)器,STB和DSP核電源。
ADP1882/ADP1883主要特性:
Power input voltage as low as 2.75 V to 20 V
Bias supply voltage range: 2.75 V to 5.5 V
Minimum output voltage: 0.8 V
0.8 V reference voltage with ±1.0% accuracy
Supports all N-channel MOSFET power stages
Available in 300 kHz, 600 kHz, and 1.0 MHz options
No current-sense resistor required
Power saving mode (PSM) for light loads (ADP1883 only)
Resistor-programmable current-sense gain
Thermal overload protection
Short-circuit protection
Precision enable input
Integrated bootstrap diode for high-side drive
140 μA shutdown supply current
Starts into a precharged load
Small, 10-lead MSOP package
ADP1882/ADP1883應(yīng)用:
Telecom and networking systems
Mid to high end servers
Set-top boxes
DSP core power supplies
圖1。ADP1882/ADP1883方框圖
圖2。ADP1882/ADP1883典型應(yīng)用電圖
圖3。ADP1882大電流評估板電路圖(藍(lán)色為大電流通路)
圖4。ADP1882大電流評估板PCB布局圖
圖5。ADP1882 應(yīng)用電路:12V輸入,1.8V/15A輸出,300kHz
圖6。ADP1882 應(yīng)用電路:5.5V輸入,2.5V/15A輸出,600kHz
圖7。ADP1882 應(yīng)用電路:13V輸入,1.8V/20A輸出,300kHz
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