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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
- 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
- Process control / Precision instruments / Low-noise filament supplies
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Product series | C | Tol. C | VR (V (DC)) | Size | Operating Temperature | DF (%) | RISO | Ceramic Type | L (mm) | W (mm) | Fl (mm) | VIN | VOut1 (V (DC)) | IOut1 (A) | Type of Insulation | fswitch (kHz) | ∫Udt (Vµs) | NPRI : NSEC | L (µH) | VT (V (RMS)) | Mount | Pins | Rows | H (mm) | Gender | Type | IR (A) | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 885012206095 | SPEC | 8 files | WCAP-CSGP MLCCs 50 V(DC) | 100 nF | ±10% | 50 | 0603 | -55 °C up to +125 °C | 3 | 5 GΩ | X7R Class II | 1.6 | 0.8 | 0.4 | – | – | – | – | – | – | – | – | – | – | – | – | 0.8 | – | – | – | 7" Tape & Reel | ||
 | 61300411021 | SPEC | – | 6 files | WR-PHD 2.54 mm THT Angled Pin Header | – | – | – | – | -40 °C up to +105 °C | – | 1000 MΩ | – | 10.16 | – | – | – | – | – | – | – | – | – | – | – | THT | 4 | Single | – | Pin Header | Angled | 3 | Bag | |
 | 750313638 | SPEC | – | 7 files | WE-PPTI Push-Pull Transformers | – | – | – | 1209 | -40 °C up to +125 °C | – | – | – | 9.14 | 12.7 | – | 5 V (DC) | 5 | 0.65 | Reinforced | 300 - 620 | 10 | 1:1.3 | 340 | 5000 | SMT | – | – | 7.62 | – | – | – | Tape and Reel |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 885012206095 | SPEC | |
| 61300411021 | SPEC | – |
| 750313638 | SPEC | – |
| Samples |
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| Order Code | Datasheet | Simulation | Downloads | Product series | C | Tol. C | VR (V (DC)) | Size | Operating Temperature | DF (%) | RISO | Ceramic Type | L (mm) | W (mm) | Fl (mm) | VIN | VOut1 (V (DC)) | IOut1 (A) | Type of Insulation | fswitch (kHz) | ∫Udt (Vµs) | NPRI : NSEC | L (µH) | VT (V (RMS)) | Mount | Pins | Rows | H (mm) | Gender | Type | IR (A) | Packaging | Samples |
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