如何解决设计难点（第二部分）VIP免费

如何解决设计难点（第二部分）16 April 2020©2020 Analog Devices, Inc. All rights reserved.1 中级第四讲：系统级低功耗，超低待机功耗设计16 April 2020©2020 Analog Devices, Inc. All rights reserved.2 微信扫描二维码获取课程观看链接待机时间与系统功耗的关系16 April 2020©2020 Analog Devices, Inc. All rights reserved.3 3.8V@3100mAH 电池，能够工作多久？负载3.3V系统， 500mA电流89%Efficiency DC/DC：Ibat=(500x3.3/3.8)/0.89=487mA3100/500=6.4小时 92%Efficiency DC/DC：Ibat=(500x3.3/3.8)/0.92=466mA3100/466=6.7小时 待机时间与系统功耗的关系16 April 2020©2020 Analog Devices, Inc. All rights reserved.4 3.8V@3100mAH 电池，能够工作多久？负载3.3V系统， 100uA待机电流LDO：Ibat=5mA+0.1mA=5.1mA3100/5.1=607小时=25天 Ibattery=电源待机电流+系统待机电流 常见的几种工作状态及电流16 April 2020©2020 Analog Devices, Inc. All rights reserved.5 •Burst Mode: Ibat=(0.1x3.3/3.8)/0.55+450uA=158uA+450uA=608uA3100/0.608=5091小时=212天•Pulse Skip: Ibat=(0.1x3.3/3.8)/0.16+450uA=543uA+450uA=993uA3100/0.608=3121小时=130天•Forced Continuous: Ibat=(0.1x3.3/3.8)/0.02+450uA=4342uA+450uA=4792uA3100/4.79=647小时=27天3.8V@3100mAH 电池，能够工作多久？负载3.3V系统， 100uA待机电流Ibattery=电源待机电流+系统待机电流 未来性能发展的推动16 April 2020©2020 Analog Devices, Inc. All rights reserved.6 LT8645S最新的Silent Switch技术©2020 Analog Devices, Inc. All rights reserved.7 16 April 20203.8V@3100mAH 电池，能够工作多久？负载3.3V系统， 100uA待机电流Ibattery=电源待机电流+系统待机电流 ©2020 Analog Devices, Inc. All rights reserved.8 16 April 2020► Current in inductor is allowed reverse direction during a portion of a cycle§ Current flowing back and forth through the switches giving away a little more power and efficiencyBenefits to allowing this reverse current flowØ Output ripple voltage and frequency remain constant at all loads easing filtering requirementsØ Popular with...