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Texas Instruments TLV76050DBZR | Demoboard TIDA-010085
24-VAC multi-channel solid state relay reference design using digital isolator
Overview
| Topology | Other Topology |
| IC revision | 001 |
Description
This reference design demonstrates a multi-channel solid state relay (SSR) using a single isolation. The design uses a multi-channel digital isolator with a single isolated power supply and common ground gate-drive circuit to control multiple SSRs independently. The design is rated for 24-VAC powered relays with current rating up to 2 A, but scalable up to 240 VAC and higher current rating. Each SSR channel consumes less than 75-mm2 space with a maximum height of the component around 3-mm, enabling considerable size saving compared to electromechanical relays. The use of single isolated power supply reduces board space and BOM cost
Features
- Multiple solid-state relays using a single isolation with multichannel digital isolator, easily scalable to any number of SSR channels with minimum extra cost
- SSR drive voltage 24 VAC ±20%, drive current 2-A RMS (voltage and current rating, scalable by using appropriately rated components)
- SSR turn on and turn off time: 15–300 μs (adjustable), average current consumption per SSR drive (referred to primary) < 4 mA (adjustable down to 20 μA per channel)
- SSR size < 75 mm2 per channel. Height is around 3 mm.
- Functionally isolated open-loop flyback based power supply without the need of an MCU
- Surge and switching overvoltage protection
Typical applications
- Thermostat, HVAC Controller
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | λDom typ.(nm) | Emitting Color | λPeak typ.(nm) | IV typ.(mcd) | VF typ.(V) | Chip Technology | 2θ50% typ.(°) | C | Tol. C | VR(V (DC)) | Size | Operating Temperature | DF(%) | RISO | Ceramic Type | L(mm) | W(mm) | H(mm) | Fl(mm) | Packaging | L1(µH) | L2(µH) | n | IR(A) | ISAT(A) | RDC1 typ(mΩ) | RDC2 typ(mΩ) | RDC1 max(mΩ) | RDC2 max(mΩ) | fres 1(MHz) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WL-SMCW SMT Mono-color Chip LED Waterclear, 625 nm, Red | Downloads27 files RAY files
| Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear | Dominant Wavelength [typ.]625 nm | Emitting ColorRed | Peak Wavelength [typ.]630 nm | Luminous Intensity [typ.]250 mcd | Forward Voltage [typ.]2 V | Chip TechnologyAlInGaP | Viewing Angle Phi 0° [typ.]140 ° | – | – | – | Size0603 | Operating Temperature -40 °C up to +85 °C | – | – | – | Length1.6 mm | Width0.8 mm | Height0.7 mm | – | PackagingTape and Reel | – | – | – | – | – | – | – | – | – | – | |||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | – | – | Capacitance1 nF | Capacitance±10% | Rated Voltage50 V (DC) | Size0402 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor2.5 % | Insulation Resistance10 GΩ | Ceramic TypeX7R Class II | Length1 mm | Width0.5 mm | Height0.5 mm | Pad Dimension0.25 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | |||||
 | WE-MTCI SMT Multi-Turn Ratio coupled Inductor, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MTCI SMT Multi-Turn Ratio coupled Inductor | – | – | – | – | – | – | – | – | – | Rated Voltage80 V (DC) | Size5030 | Operating Temperature -40 °C up to +125 °C | – | – | – | Length5.2 mm | Width5.2 mm | Height3.1 mm | – | – | Inductance 133 µH | Inductance 2297 µH | Turns Ratio1:3 | Rated Current0.45 A | Saturation Current0.75 A | DC Resistance 11466 mΩ | DC Resistance 23758 mΩ | DC Resistance 11900 mΩ | DC Resistance 25200 mΩ | Self Resonant Frequency [1]4 MHz |