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[原创] SilabsSi827x系列抗高瞬变(dV/dt) 4A驱动器解决方案

关键词:电源管理 开关电源 AC/DC转换器 Si827x

时间:2017-06-07 10:12:36       作者:Silabs       来源:中电网

Silabs公司的Si827x系列是抗高瞬变(dV/dt) 4AISOdriver驱动器,采用公司有专属权的硅隔离技术,支持UL1577和VDE0884的高达2.5kVRMS耐受电压,单路,双路或高边/低边驱动器,单PWM或双数字输入,输入电源2.5V-5.5V,驱动电源4.2V-30V,抖动200ps,传输时延60ns,主要用在开关电源,太阳能逆变器,马达控制和驱动,不间断电源(UPS),大功率D类放大器.本文介绍了Si827x系列主要特性,框图,应用电路和评估板Si827x-EVB主要案特性,电路途遥远,材料清单和PCB设计图.

The Si827x isolators are ideal for driving power switches used in a wide variety of power supply, inverter, and motor control applications. The Si827x isolated gate drivers utilize Silicon Laboratories’proprietary silicon isolation technology, supporting up to 2.5 kVRMS withstand voltage per UL1577 and VDE0884. This technology enables industry leading common-mode transient immunity (CMTI), tight timing specifications,reduced variation with temperature and age, better part-to-part matching, and extremely high reliability.

It also offers unique features such as separate pull-up/down outputs, driver shutdown on UVLO fault, and precise dead time programmability. The Si827x series offers longer service life and dramatically higher reliability compared to opto-coupled gate drivers.

The Si827x drivers utilize Silicon Labs’ proprietary silicon isolation technology, which provides up to 2.5 kVRMS withstand voltage per UL1577 and fast 60 ns propagation times. Driver outputs can be grounded to the same or separate grounds or connected to a positive or negative voltage. The TTL level compatible inputs with >400 mV hysteresis are available in individual control input (Si8271/2/3/5) or PWM input (Si8274) configurations.

High integration, low propagation delay, small installed size,flexibility,and costeffectivenessmake the Si827x family ideal for a wide range of isolated MOSFET/IGBTand SiC or GaN FET gate drive applications.

Si827x系列主要特性:

• Single, dual, or high-side/low-side drivers
• Single PWM or dual digital inputs
• High dV/dt immunity:
• 200 kV/μs CMTI
• 400 kV/μs Latch-up
• Separate pull-up/down outputs for slew ratecontrol
• Wide supply range:
• Input supply: 2.5–5.5 V
• Driver supply: 4.2–30 V
• Very low jitter of 200 ps p-p
• 60 ns propagation delay (max)
• Dedicated enable pin
• Silicon Labs’ high performance isolationtechnology:
• Industry leading noise immunity
• High speed, low latency and skew
• Best reliability available
• Compact packages:
• 8-pin SOIC
• 16-pin SOIC
• 5 x 5 mm LGA-14
• Industrial temperature range:
• –40 to 125 ℃
• AEC-Q100 Qualified

Si827x系列应用:

• Switch-mode Power Supplies
• Solar Power Inverters
• Motor control and drives
• Uninterruptible Power Supplies
• High-Power Class D Amplifiers
安全认证(申办中):
• UL 1577 recognized
• Up to 2500 Vrms for 1 minute
• CSA component notice 5A approval
• IEC 60950-1 (reinforced insulation)
• VDE certification conformity
• VDE 0884 Part 10
• CQC certification approval
• GB4943.1

图1.Si8271框图

图2.Si8273框图

图3.Si8274框图

图4.Si8275框图

图5.Si827x系列半桥应用电路图

图6.Si827x系列双驱动器应用电路图

Si827x系列评估板Si827x-EVB

The Si827x evaluation board allows designers to evaluate Silicon Lab’s Si827x family of high CMTI performance ISOdrivers. The boards come populated with the Si8271 and either the Si8273, Si8274, or Si8275 version of the family. The board includes screw terminals for quick evaluation of the devices’ key parameters and also includes test points on each devices’ pins to accommodate direct connection to the designer’s end system.The product data sheet and numerous application notes can be referenced to help facilitatedesigns.

估板Si827x-EVB包括:

• Si827x-based evaluation board (Si827x-EVB)
• Si8271, 1-input, 4 A, 2.5 kVRMS SingleISOdriver, and one of the following:
• Si8273, 2-input, 4 A, 2.5 kVRMS High-Side/Low-Side ISOdriver
• Si8274, PWM-input, 4 A, 2.5 kVRMSHigh-Side/Low-Side ISOdriver
• Si8275, 2-input, 4 A, 2.5 kVRMS DualISOdriver

图7.评估板Si827x-EVB外形图

图8.评估板Si827x-EVB电路图(1)

图9.评估板Si827x-EVB电路图(2)
评估板Si827x-EVB材料清单:




图10.评估板Si827x-EVB PCB设计图(1):正面丝印图

图11.评估板Si827x-EVB PCB设计图(2):背面丝印图

图12.评估板Si827x-EVB PCB设计图(3):层1

图13.评估板Si827x-EVB PCB设计图(4):层2地线面

图14.评估板Si827x-EVB PCB设计图(5):层3电源面

图15.评估板Si827x-EVB PCB设计图(6):层4
详情请见:
http://www.silabs.com/documents/public/data-sheets/Si827x.pdf
http://www.silabs.com/documents/public/user-guides/UG186.pdf
Si827x.pdf
UG186.pdf

 

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