background image

 

RD014-RGUIDE-01 

2018-03-15 

Rev. 1 

19

 / 

19

 

© 2018 

Toshiba Electronic Devices & Storage Corporation

 

Terms of Use 

This terms of use is made between Toshiba Electronic Devices and Storage Corporation (“We”) and customers who 

use documents and data that are consulted to design electronics applications on which our semiconductor devices 
are mounted (“this Reference Design”). Customers shall comply with this terms of use. Please note that it is assumed 
that customers agree to any and all this terms of use if customers download this Reference Design. We may, at its 
sole and exclusive discretion, change, alter, modify, add, and/or remove any part of this terms of use at any time 
without any prior notice. We may terminate this terms of use at any time and for any reason. Upon termination of 
this terms of use, customers shall destroy this Reference Design. In the event of any breach thereof by customers, 
customers shall destroy this Reference Design, and furnish us a written confirmation to prove such destruction. 
 
1.

 

Restrictions on usage 

1. This Reference Design is provided solely as reference data for designing electronics applications. Customers shall 

not use this Reference Design for any other purpose, including without limitation, verification of reliability. 

2. This Reference Design is for customer's own use and not for sale, lease or other transfer. 
3. Customers shall not use this Reference Design for evaluation in high or low temperature, high humidity, or high 

electromagnetic environments. 

4. This Reference Design shall not be used for or incorporated into any products or systems whose manufacture, 

use, or sale is prohibited under any applicable laws or regulations. 
 
2.

 

Limitations 

1. We reserve the right to make changes to this Reference Design without notice. 
2.  This  Reference  Design  should  be  treated  as  a  reference  only.  We  are  not  responsible  for  any  incorrect  or 

incomplete data and information. 

3.  Semiconductor  devices  can  malfunction  or  fail.  When  designing  electronics  applications  by  referring  to  this 

Reference Design, customers are responsible for complying with safety standards and for providing adequate designs 
and  safeguards  for  their  hardware,  software  and  systems  which  minimize  risk  and  avoid  situations  in  which  a 
malfunction or failure of semiconductor devices could cause loss of human life, bodily injury or damage to property, 
including data loss or corruption. Customers must also refer to and comply with the latest versions of all relevant our 
information, including without limitation, specifications, data sheets and application notes for semiconductor devices, 
as well as the precautions and conditions set forth in the "Semiconductor Reliability Handbook". 

4.  When  designing  electronics  applications  by  referring  to  this  Reference  Design,  customers  must  evaluate  the 

whole system adequately. Customers are solely responsible for all aspects of their own product design or applications. 
WE ASSUME NO LIABILITY FOR CUSTOMERS' PRODUCT DESIGN OR APPLICATIONS. 

5. No responsibility is assumed by us for any infringement of patents or any other intellectual property rights of 

third parties that may result from the use of this Reference Design. No license to any intellectual property right is 
granted by this terms of use, whether express or implied, by estoppel or otherwise. 

6. THIS REFERENCE DESIGN IS PROVIDED "AS IS". WE (a) ASSUME NO LIABILITY WHATSOEVER, INCLUDING 

WITHOUT LIMITATION, INDIRECT, CONSEQUENTIAL, SPECIAL, OR INCIDENTAL DAMAGES OR LOSS, INCLUDING 
WITHOUT  LIMITATION,  LOSS  OF  PROFITS,  LOSS  OF  OPPORTUNITIES,  BUSINESS  INTERRUPTION  AND  LOSS  OF 
DATA, AND (b) DISCLAIM ANY AND ALL EXPRESS OR IMPLIED WARRANTIES AND CONDITIONS RELATED TO THIS 
REFERENCE  DESIGN,  INCLUDING  WARRANTIES  OR  CONDITIONS  OF  MERCHANTABILITY,  FITNESS  FOR  A 
PARTICULAR PURPOSE, ACCURACY OF INFORMATION, OR NONINFRINGEMENT. 
 
3.

 

Export Control 

Customers shall not use or otherwise make available this Reference Design for any military purposes, including 

without limitation, for the design, development, use, stockpiling or manufacturing of nuclear, chemical, or biological 
weapons or missile technology products (mass destruction weapons). This Reference Design may be controlled under 
the applicable export laws and regulations including, without limitation, the Japanese Foreign Exchange and Foreign 
Trade Law and the U.S. Export Administration Regulations. Export and re-export of this Reference Design are strictly 
prohibited except in compliance with all applicable export laws and regulations. 
 
4.

 

Governing Laws 

This terms of use shall be governed and construed by laws of Japan.

 

 

Summary of Contents for TLP7820

Page 1: ...RD014 RGUIDE 01 2018 03 15 Rev 1 1 19 2018 Toshiba Electronic Devices Storage Corporation Isolation Amplifier Application Circuits Voltage Sensing of the TLP7820 Reference Guide RD014 RGUIDE 01 ...

Page 2: ...sing 9 3 2 Bill of materials 10 4 GUIDELINES FOR DESIGNING A VOLTAGE SENSING CIRCUIT 10 4 1 Voltage sensing resistors in a voltage sensing circuit 10 4 2 Test mode considerations 11 5 SIMULATION 11 5 1 Basic operation 11 5 2 Noise superimposed on the input voltage 13 5 3 Circuit with filters 14 6 PRODUCT OVERVIEW 16 6 1 Overview 16 6 2 External view and pin assignment 17 6 3 Internal block diagram...

Page 3: ... sides of the TLP7820 isolation amplifier are optically coupled using an LED and a photodiode to provide electrical isolation and internal signal transfer of optical transfer with digital signal realizes high accuracy signal transfer The delta sigma AD converter at the primary side encodes an input analog signal into digital data then optically transmitted to the secondary side by an LED At the se...

Page 4: ...noise from outside A common mode noise generates a displacement current to flow through the internal coupling capacitance between the primary input and secondary output sides of a photocoupler and if a displacement current excees a given level into coupling capacitor the photocoupler has malfunction then resulting in faulty system operation A displacement current generated by transient common mode...

Page 5: ...GBTs have rise and fall times tr and tf of roughly 100ns when switching Under these conditions the slew rate dV dt of VCM is calculated to be 4kV μs at a supply voltage of 400V and 8kV μs at 800V Figure 2 2 shows examples of output waveforms of the TLP7820 when common mode voltages VCM with 4 kV μs and 8 kV μs slew rates are applied As shown in Figure 2 2 VOUT does not have much noise which proves...

Page 6: ...eristics to control system properly The output of an isolation amplifier with bad linearity characteristics does not respond accurately with specific input so there are lacking of the stability and accuracy of a system In the trend of increasing speed accurate control is required for inverters and it is important for isolation amplifier to minimize the output errors Although an electronic circuit ...

Page 7: ... The sum of the absolute values of the maximum and minimum deviations dev_max dev_min is calculated 4 The ratio of this sum to the full scale differential output voltage VOH VOL is calculated Figure 2 5 shows the relationship between the input voltage and the output voltage deviation from the line of the best fit Figure 2 5 Input voltage vs output voltage deviation from the line of best fit NL200 ...

Page 8: ...commend operating range 0 2 to 0 2 V This contributes reduction of the maximum circuit current simplifying the design of a primary side power supply A Competitor A B TLP7820 Figure 2 6 Relationships between the input voltage and the primary side supply current of isolation amplifiers Figure 2 7 B shows the changes in the primary side supply current in response to input voltage changes at a given f...

Page 9: ... reduce the circuit size Obviously the constant supply current of the TLP7820 contributes power supply consumption reduction and the circuit size reduction In the trend of increasing system speed this also contributes suppress electromagnetic interference EMI caused by large supply voltage fluctuations 3 Application circuit example and its bill of materials 3 1 Example of an application circuit fo...

Page 10: ...Pin 2 and GND of TLP7820 The followings are calculation examples of voltage sensing resistors Eexample 1 Sensing error below 0 5 Equivalent input resistor of TLP7820 Ri 80 kΩ R1 R1 Ri R1 R1 80kΩ R1 80kΩ 1 0 995 0 995 80kΩ R1 80kΩ 0 995 R1 0 995 80kΩ 80 kΩ R1 402 Ω When R1 is selected from E24 series R1 390 Ω Applied voltage 400 V Detecting voltage 200 mV No Ref Qty Value Part Number Manufacturer D...

Page 11: ... 750Ω 750Ω 200mV R2 R3 200mV 750Ω 400V 750Ω R2 R3 1 5 MΩ When R2 and R3 are selected from E24 series R2 750 Ω and R3 750 Ω R2 and R3 are connected in series to ensure creepage distance of resistors The tolerances of R1 R2 and R3 should be considered to calculate actual voltage sensing error 4 2 Test mode considerations The TLP7820 enters test mode when either the VIN or VIN pin exceeds VDD1 2 volt...

Page 12: ...has x8 2 as large an amplitude as the input signal 10kHz sine wave with 0 2Vp p This is equal to the specified typical gain of x8 2 of the TLP7820 indicating that simulation ran properly Figure 5 2 Simulation results Vin Vout Time 0s 50us 100us 150us 200us 250us 300us 1 V Vin 2 V Vout 250mV 200mV 150mV 100mV 50mV 0mV 50mV 100mV 150mV 200mV 250mV V i n 0 6V 0 8V 1 0V 1 2V 1 4V 1 6V 1 8V 2 0V 2 2V 2...

Page 13: ... 5 3 shows the circuit simulated Figure 5 3 Simulation circuit superimposing a noise Figure 5 4 shows the simulation results which indicate that the output waveform was not measured properly due to the influence of the noise Figure 5 4 Simulation waveforms with noise Vin Vout V_noise is superimposed on Vin1 Time 0s 50us 100us 150us 200us 250us 300us 1 V Vin 2 V Vout 250mV 200mV 150mV 100mV 50mV 0m...

Page 14: ...put line Noise filter frequency 230kHz Amplitude adjustment gain 0 dB Input series resistors 10 kΩ Input bypass capacitors C4 C5 68 pF Figure 5 5 shows the simulation circuit Figure 5 5 Circuit with filters simulated Figure 5 6 provides the simulation results which show that the filters removed a noise from the output waveform The output is a 10kHz sine wave with 1 64Vp p which has x8 2 as large a...

Page 15: ...ation Figure 5 6 Results of simulation of a circuit with filters Time 0s 50us 100us 150us 200us 250us 300us 1 V Vin 2 V Vout 250mV 200mV 150mV 100mV 50mV 0mV 50mV 100mV 150mV 200mV 250mV V i n 0 6V 0 8V 1 0V 1 2V 1 4V 1 6V 1 8V 2 0V 2 2V 2 4V 2 6V V o u t 1 64 Vp p Vout Vin Vin1 V_noise ...

Page 16: ...sumption Primary supply current 8 6 mA typical Secondary supply current 6 2 mA typical Thin package SO8L contributes flexible PCB designs Excellent output nonlinearity characteristics NL200 0 02 typical at Vin 200mV to 200mV NL100 0 015 typical at Vin 100mV to 100mV Excellent temperature stability Input offset drift 2μV C typical Gain drift 0 00012V V C typical VOUT nonlinearity drift 0 00007 C ty...

Page 17: ... diagram Note Add 0 1μF bypass capacitors between Pin 1 and Pin 4 and between Pin 5 and Pin 8 Figure 6 2 Internal block diagram of the TLP7820 External view and marking Pin assignment Pin No Symbol Description 1 VDD1 Input side supply voltage 2 VIN Positive input 3 VIN Negative input 4 GND1 Input side ground 5 GND2 Output side ground 6 VOUT Negative output 7 VOUT Positive output 8 VDD2 Output side...

Page 18: ...tput voltages obtained from different primary and secondary side power supply combinations Table 6 1 Output voltages for different power supply combinations VOUT output VOUT output Primary Side Power Supply VDD1 Primary Side Power Supply VDD1 ON OFF ON OFF Secondary Side Power Supply VDD2 ON VIN x Gain 2 1 25 V GND Secondary Side Power Supply VDD2 ON VIN x Gain 2 1 25 V 2 5 V OFF GND GND OFF GND G...

Page 19: ...s which minimize risk and avoid situations in which a malfunction or failure of semiconductor devices could cause loss of human life bodily injury or damage to property including data loss or corruption Customers must also refer to and comply with the latest versions of all relevant our information including without limitation specifications data sheets and application notes for semiconductor devi...

Reviews: