Toshiba Electronic Devices and Storage Corporation

Discrete Thermostat Solution

Toshiba's discrete thermostat improves operating life and increases the functionality and performance of smart home devices

Image of Toshiba's Discrete Thermostat SolutionToshiba's discrete thermostat solution improves operating life and increases the functionality and performance of smart home devices while reducing power consumption and space requirements. Energy efficiency savings, smart controlling, and reduction in per-unit energy costs are a few of the underlining parameters where these devices shine. Toshiba offers products that meet these important requirements and more with their LDO technologies and photo relays, which have garnered success in thermostats and other similar designs.

Power Supply Circuit Block Diagram

Image of Toshiba's Power Circuit Block Diagram

Various power supply voltages are required for thermostat sensors and high-frequency circuits to increase functionality and reduce power consumption. Therefore, it is especially important to choose an LDO regulator for power supply stabilization and voltage conversion. For LDO regulators, TCR3UM and TAR5SB are recommended. Low stand-by current reduces total system power consumption, and overtemperature/overcurrent protection provides stability to avoid unexpected system power events.

Interface Circuit Block Diagram

Image of Toshiba's Interface Circuit Block Diagram

In Europe and North America, central heating and forced air systems are standard. Modern systems for heating, cooling, and ventilation (HVAC) have evolved, and thermostats are an integral part. This system is connected to a motor or something similar, which means that the thermostat is always exposed to the risk of motor noise or abnormality. Isolation from the system is essential to avoid this risk. The photorelays shown below are preferred for such isolation due to low ON-resistance (RON), a wide range of allowable on-current (ION), and are available in small packages designed to shrink the footprint and improve design flexibility.

Resources

Application details

Features
  • Keeps low stand-by current for low-power operation
  • Increases heat dissipation capabilities with efficient packaging
  • Optical coupling over an isolated barrier
  • Application notes, reference designs and other material to help with design
  • Wide portfolio of products

LDO Regulators

ImageManufacturer Part NumberDescriptionAvailable QuantityPriceView Details
IC REG LINEAR 5V 200MA SMVTAR5SB50(TE85L,F)IC REG LINEAR 5V 200MA SMV4500 - Immediate$2.96View Details
IC REG LINEAR 1.8V 300MA 4-DFNTCR3UM18A,LFIC REG LINEAR 1.8V 300MA 4-DFN0 - Immediate$3.95View Details
IC REG LINEAR 2.8V 300MA 4-DFNTCR3UM28A,LFIC REG LINEAR 2.8V 300MA 4-DFN0 - Immediate$3.95View Details
IC REG LINEAR 3V 300MA 4-DFNTCR3UM30A,LFIC REG LINEAR 3V 300MA 4-DFN0 - Immediate$3.70View Details

Isolation/Switch (Photorelays)

ImageManufacturer Part NumberDescriptionAvailable QuantityPriceView Details
SSR RELAY SPST-NO 4A 0-60VTLP3107A(TP,FSSR RELAY SPST-NO 4A 0-60V10817 - Immediate$32.68View Details
SSR RELAY SPST-NO 3A 0-100VTLP3109A(TP,FSSR RELAY SPST-NO 3A 0-100V0 - Immediate$38.77View Details
SSR RELAY SPST-NO 3A 0-60VTLP3555A(TP1,FSSR RELAY SPST-NO 3A 0-60V1176 - Immediate$25.19View Details
SSR RELAY SPST-NO 3A 0-100VTLP3823F(TP4,FSSR RELAY SPST-NO 3A 0-100V0 - Immediate$64.79View Details
SSR RELAY SPST-NO 1.5A 0-200VTLP3825F(TP4,FSSR RELAY SPST-NO 1.5A 0-200V752 - Immediate$64.79View Details

Associated Product

ImageManufacturer Part NumberDescriptionAvailable QuantityPriceView Details
MOSFET P-CH 20V 250MA VESMSSM3J35AMFV,L3FMOSFET P-CH 20V 250MA VESM20898 - Immediate$1.73View Details
MOSFET N-CH 20V 500MA VESMSSM3K36MFV,L3FMOSFET N-CH 20V 500MA VESM397980 - Immediate$2.80View Details
MOSFET N-CH 20V 1.4A CST3SSM3K56ACT,L3FMOSFET N-CH 20V 1.4A CST3138274 - Immediate$0.91View Details
MOSFET P-CH 20V 1.4A CST3SSM3J56ACT,L3FMOSFET P-CH 20V 1.4A CST317494 - Immediate$3.38View Details
MOSFET P-CH 20V 10A 6UDFNBSSM6J501NU,LFMOSFET P-CH 20V 10A 6UDFNB1671 - Immediate$5.02View Details
MOSFET N-CH 30V 15A 6UDFNBSSM6K513NU,LFMOSFET N-CH 30V 15A 6UDFNB52047 - Immediate$5.84View Details
MOSFET N-CH 40V 12A 6UDFNBSSM6K514NU,LFMOSFET N-CH 40V 12A 6UDFNB14018 - Immediate$5.35View Details
MOSFET P-CH 60V 3.5A SOT-23FSSM3J351R,LFMOSFET P-CH 60V 3.5A SOT-23F59051 - Immediate$4.53View Details
IC CMOS 1 CIRCUIT UFVTC75S67TU,LFIC CMOS 1 CIRCUIT UFV12018 - Immediate$2.30View Details
Published: 2020-07-02

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