Overview
The LTC1923EGN#PBF, produced by Analog Devices Inc., is a high-efficiency thermoelectric cooler (TEC) controller designed for applications requiring either unidirectional or bidirectional drive circuits. This pulse width modulator integrates all necessary control circuitry and two sets of complementary output drivers to drive a full bridge, enabling efficient bidirectional current flow to the TEC. The LTC1923 is particularly suited for precise temperature control in systems such as laser diode cooling, where it can achieve a typical temperature setpoint accuracy of 0.1°C, and with additional components, setpoint stability of 0.01°C.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Input Supply VDD | Operating Supply Voltage | 2.7 | 5.5 | 5.5 | V |
| UVLO (Undervoltage Lockout) | Low to High Threshold | 2.6 | 2.7 | 2.7 | V |
| UVHYST (Hysteresis) | High to Low | 50 | 130 | 130 | mV |
| IDD (Operating Supply Current) | No Output Load, Outputs Not Switching | 2 | 4 | 4 | mA |
| IDDSHDN (Shutdown IDD) | SDSYNC = 0V | 10 | 25 | 25 | µA |
| SHDNTH (Shutdown Threshold) | Measured at PDRVA, PDRVB | 0.3 | 0.8 | 1.4 | V |
| Operating Temperature Range | -40 | 85 | °C | ||
| Storage Temperature Range | -65 | 125 | °C | ||
| Lead Temperature (Soldering, 10 sec) | 300 | °C |
Key Features
- Integrated Control Circuitry and Output Drivers: The LTC1923 includes all necessary control circuitry and two sets of complementary output drivers to drive a full bridge, enabling efficient bidirectional current flow to the TEC.
- Precise Temperature Control: Achieves typical temperature setpoint accuracy of 0.1°C and with additional components, setpoint stability of 0.01°C.
- Adjustable Heating and Cooling Current Limits: Independent adjustable heating and cooling pulse-by-pulse current limits for precise control.
- Current Soft-Start and Output Slew Rate Control: Features current soft-start for controlled start-up and output slew rate control to reduce system noise.
- Differential Current Sense and Voltage Amplifiers: Includes differential current sense and voltage amplifiers for accurate monitoring and control.
- Auxiliary Circuits for Protection and Monitoring: Host of auxiliary circuits to protect the laser and provide redundant system monitoring.
Applications
- Laser Diode Cooling: The LTC1923 is particularly suited for precise temperature control in laser diode systems, ensuring stable operation and optimal performance.
- Thermoelectric Cooler (TEC) and Heater Applications: Designed for both unidirectional and bidirectional TEC or heater applications, making it versatile for various thermal management needs.
- High-Precision Temperature Control Systems: Ideal for any system requiring high accuracy and stability in temperature control, such as in scientific instruments, medical devices, and industrial equipment.
Q & A
- What is the primary function of the LTC1923?
The LTC1923 is a pulse width modulator designed for thermoelectric cooler (TEC) or heater applications, providing precise temperature control.
- What is the typical temperature setpoint accuracy of the LTC1923?
The LTC1923 achieves a typical temperature setpoint accuracy of 0.1°C, and with additional components, setpoint stability of 0.01°C.
- What are the key features of the LTC1923's output drivers?
The LTC1923 includes two sets of complementary output drivers to drive a full bridge, enabling efficient bidirectional current flow to the TEC.
- What is the operating supply voltage range of the LTC1923?
The operating supply voltage range of the LTC1923 is from 2.7V to 5.5V.
- What is the shutdown current of the LTC1923 when SDSYNC = 0V?
The shutdown current (IDDSHDN) of the LTC1923 when SDSYNC = 0V is between 10µA and 25µA.
- What are the storage and operating temperature ranges of the LTC1923?
The storage temperature range is -65°C to 125°C, and the operating temperature range is -40°C to 85°C.
- What are some of the auxiliary circuits included in the LTC1923?
The LTC1923 includes auxiliary circuits such as differential current sense and voltage amplifiers, and circuits for protecting the laser and providing redundant system monitoring.
- What is the lead temperature for soldering the LTC1923?
The lead temperature for soldering the LTC1923 is 300°C for 10 seconds.
- What are some common applications of the LTC1923?
The LTC1923 is commonly used in laser diode cooling, TEC or heater applications, and other high-precision temperature control systems.
- How does the LTC1923 reduce system noise?
The LTC1923 reduces system noise through its output slew rate control feature.
