The demand for isolation design is becoming more and more widespread in industrial system design considering factors such as high voltage resistance, safety, and noise immunity, and converting signals/power into isolated ways for transmission has been one of the difficult points in system design. As a leader in isolation technology, Naxmicro has been committed to exploring more integrated, reliable and cost-effective isolated power solutions. This paper introduces Naximicro's integrated isolated power supply 3CH digital isolation solution, which will effectively help developers to simplify industrial system design.

 

　　On-chip transformer-based isolated power supply solution

 

　　According to different requirements, the isolated power supply in the system can be divided into three parts: drive isolated power supply, sampling isolated power supply, and communication isolated power supply, among which, the drive/sampling isolated power supply is more inclined to adopt the external transformer/multi-winding output power supply scheme due to its relatively large power and centralized layout; while for communication isolated power supply, the layout is relatively far from the main power circuit of the system and the power consumption is relatively low, the independent The form of isolated power supply module is often more favored.

 

　　NIRSP31 adopts the industry-leading on-chip transformer technology and integrates isolated power supply and three-channel digital isolator on a single chip, and uses advanced LGA package (4mm×5mm) process, which greatly reduces the PCB layout area and height compared to the traditional independent isolated power supply module + optocoupler/digital isolator solution, and can further reduce the system cost.

 

　　-Solution area reduction >200%

 

　　-Solution cost reduction >15%

 

　　-Flexible configuration, with optional 5V/3.3V output

 

　　-Integrated closed-loop control circuitry, excellent load regulation

 

　　-Wider operating temperature range (-40~125℃), low output power temperature derating

 

　　-Enable (EN) pin, suitable for low static power requirements applications

 

　　-Low parasitic capacitance of primary and secondary sides, high resistance to common mode interference

 

　　-3000Vrms one minute insulation withstand voltage

 

　　-Integrated short circuit protection/over temperature protection/undervoltage protection

 

　　-Fully automated package, high reliability, low failure rate

 

　　-High transmission rate and long life compared to optocoupler

 

　　Highly integrated, highly reliable, cost-effective isolated power supply 3CH digital isolator NIRSP31

 

　　Key parameters

 

　　-Insulation withstand voltage of 3kVrms

 

　　-Supports separate MCU I/O level VDDL

 

　　-Supply voltage.

 

　　-VDD:4.5~5.5V NIRSP31

 

　　3~3.6V/4.5~5.5V NIRSP31V

 

　　-VDDL:1.8~3.6V/4.5~5.5V

 

　　-output.

 

　　-80mA 5V->5V/3.3V

 

　　-60mA 3.3V->3.3V

 

　　-Under-voltage protection, short-circuit protection and over-temperature protection

 

　　-Data rate: 20Mbps

 

　　-Transmission delay: <75ns

 

　　-CMTI: ±50kV/us

 

　　-Operating temperature: -40~125℃

 

　　-Package: LGA-18(4.00mm×5.00mm)

 

　　Application Scenario

 

　　-Two-wheeler BMS

 

　　-Communication power backup BMS

 

　　-Household BMS

 

　　-Industrial Electricity Meter

 

　　-Air Circuit Breaker

 

　　Industrial BMS: NIRSP31 One-Stop Solution

 

　　In industrial BMS applications, NIRSP31 can be used for 485 and CAN communication isolation between battery pack MCU and external ECU without additional isolated power supply and output side LDO (good load regulation rate) to ensure the continuity of communication and normal system operation.