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 QuantityView Details
IC REG LINEAR 5V 200MA SMVTAR5SB50(TE85L,F)IC REG LINEAR 5V 200MA SMV0View Details
IC REG LINEAR 1.8V 300MA 4DFNTCR3UM18A,LFIC REG LINEAR 1.8V 300MA 4DFN1642 - ImmediateView Details
IC REG LINEAR 2.8V 300MA 4DFNTCR3UM28A,LFIC REG LINEAR 2.8V 300MA 4DFN0View Details
IC REG LINEAR 3V 300MA 4DFNTCR3UM30A,LFIC REG LINEAR 3V 300MA 4DFN16906 - ImmediateView Details

Isolation/Switch (Photorelays)

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
PHOTORELAY; 2.54SOP6 PACKAGETLP3107A(TP,FPHOTORELAY; 2.54SOP6 PACKAGE0View Details
PHOTORELAY; 2.54SOP6 PACKAGETLP3109A(TP,FPHOTORELAY; 2.54SOP6 PACKAGE0View Details
SSR RELAY SPST-NO 3A 0-60VTLP3555A(TP1,FSSR RELAY SPST-NO 3A 0-60V0View Details
SSR RELAY SPST-NO 3A 0-100VTLP3823F(TP4,FSSR RELAY SPST-NO 3A 0-100V542 - ImmediateView Details
SSR RELAY SPST-NO 1.5A 0-200VTLP3825F(TP4,FSSR RELAY SPST-NO 1.5A 0-200V12 - ImmediateView Details

Associated Product

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
MOSFET P-CH 20V 250MA VESMSSM3J35AMFV,L3FMOSFET P-CH 20V 250MA VESM0View Details
MOSFET N-CH 20V 500MA VESMSSM3K36MFV,L3FMOSFET N-CH 20V 500MA VESM0View Details
MOSFET N-CH 20V 1.4A CST3SSM3K56ACT,L3FMOSFET N-CH 20V 1.4A CST30View Details
MOSFET P-CH 20V 1.4A CST3SSM3J56ACT,L3FMOSFET P-CH 20V 1.4A CST39953 - ImmediateView Details
MOSFET P-CH 20V 10A 6UDFNBSSM6J501NU,LFMOSFET P-CH 20V 10A 6UDFNB11212 - ImmediateView Details
MOSFET N-CH 30V 15A 6UDFNBSSM6K513NU,LFMOSFET N-CH 30V 15A 6UDFNB0View Details
MOSFET N-CH 40V 12A 6UDFNBSSM6K514NU,LFMOSFET N-CH 40V 12A 6UDFNB0View Details
MOSFET P-CH 60V 3.5A SOT-23FSSM3J351R,LFMOSFET P-CH 60V 3.5A SOT-23F0View Details
IC CMOS 1 CIRCUIT UFVTC75S67TU,LFIC CMOS 1 CIRCUIT UFV0View Details
Published: 2020-07-02