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Texas Instruments SN6505BDBVR | Demoboard TIDA-010065
High-efficiency, low-emission, isolated DC/DC converter-based analog input module reference design
Overview
| Topology | Push-Pull Converter symmetrical isolated |
| Input voltage | 5 V |
| Switching frequency | 100-1600 kHz |
| Output 1 | 6 V |
| IC revision | E2 |
Description
This reference design is a simplified architecture for generating an isolated power supply for isolated amplifiers for measuring isolated voltages and currents. A fully integrated DC/DC converter with reinforced isolation operating from a 5-V input with configurable 5-V or 5.4-V output (headroom for low dropout regulator (LDO)) generates the isolated power. Shunts that are interfaced to ±50-mV input range isolation amplifiers configured as channel isolated inputs measure the current. Potential divider output interfaced to ±250-mV or ±12-V input range isolation amplifiers configured as group isolated inputs measure the voltage. The outputs of the isolation amplifiers interface directly to 24-bit delta sigma analog-to-digital converter (ADC) or are scaled to ±10 V using gain amplifiers and interfaced to 16-bit SAR ADC for performance evaluation. On-board digital diagnostics improves reliability and enhances system performance.
Features
- Generation of high efficiency isolated supply of 5 or 5.4V (LDO head room) from 4.5 to 5.5 V input providing reinforced isolation
- Measures three group isolated voltage inputs with a range of 3-350V providing pin compatible basic or reinforced isolation and three isolated current inputs from 40mA-12.5A providing reinforced isolation
- ISO224 with input range of ±12V input range connects directly to low power current transformer output as per IEC 60044-8
- Measurement of DC voltage and current with 1us fast fault detection comparator path
- Gain scaling of isolation amplifier output to ADS8588H input range of ±10V using instrumentation, precision or general purpose amplifiers
- Achieves ±0.2% accuracy for both voltage and current using 16-bit SAR or 24-bit delta-sigma ADC
Typical applications
- Process control / Precision instruments / Low-noise filament supplies
- Isolated power supply for CAN, RS-485, RS-422, RS-232, SPI, I2C, low-power LAN / Low-noise isolated USB supplies / Distributed supplies
- Telecom supplies / Radio supplies
- Medical instruments
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | VR(V (DC)) | Size | Operating Temperature | DF(%) | RISO | Ceramic Type | L(mm) | W(mm) | H(mm) | Fl(mm) | Packaging | VIN | VOut1(V (DC)) | IOut1(A) | Type of Insulation | fswitch(kHz) | ∫Udt(Vµs) | NPRI : NSEC | L(µH) | VT(V (RMS)) | Mount | Pins | Type | IR(A) | Working Voltage(V (AC)) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WCAP-CSGP MLCCs 50 V(DC), 100 nF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance100 nF | Capacitance±10% | Rated Voltage50 V (DC) | Size0603 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor3 % | Insulation Resistance5 GΩ | Ceramic TypeX7R Class II | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |||||
 | WR-PHD Pin Header - Single, –, – | Simulation– | Downloads7 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header - Single | – | – | – | – | Operating Temperature -40 °C up to +105 °C | – | Insulation Resistance1000 MΩ | – | Length10.16 mm | – | – | – | PackagingBag | – | – | – | – | – | – | – | – | – | MountTHT | Pins4 | TypeAngled | Rated Current3 A | Working Voltage250 V (AC) | ||
 | WE-PPTI Push-Pull Transformers, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PPTI Push-Pull Transformers | – | – | – | Size1209 | Operating Temperature -40 °C up to +125 °C | – | – | – | Length9.14 mm | Width12.7 mm | Height7.62 mm | – | PackagingTape and Reel | Input Voltage 5 V (DC) | Output Voltage 15 V (DC) | Output Current 10.65 A | Type of InsulationReinforced | Switching Frequency 300 - 620 | Voltage-µSecond10 Vµs | Turns Ratio1:1.3 | Inductance340 µH | Insulation Test Voltage5000 V (RMS) | MountSMT | – | – | – | – |