Overview
The TL1431MDREP, produced by Texas Instruments, is a precision-programmable reference device designed for high accuracy and versatility. This component is part of the TL1431 family, which includes various versions tailored for different temperature ranges and applications. The TL1431MDREP is specifically characterized for operation over the full military temperature range of –55°C to 125°C, making it suitable for defense, aerospace, and medical applications.
The device features active output circuitry, providing a sharp turn-on characteristic, which makes it an excellent replacement for Zener diodes and other types of references. It can be used in a variety of applications, including onboard regulation, adjustable power supplies, and switching power supplies.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Input Voltage (VI(ref)) | 2460 | 2500 | 2540 | mV |
| Deviation of Reference Input Voltage (VI(dev)) | - | - | 55 | mV |
| Output Impedance | - | 0.2 | - | Ω |
| Sink Current Capability | 1 | - | 100 | mA |
| Reference Input Current (II(ref)) | - | 4 | 10 | μA |
| Operating Temperature Range | -55 | - | 125 | °C |
| Package Type | - | SOIC (8) | - | - |
| Body Size (Nominal) | - | 3.91 mm × 4.90 mm | - | - |
Key Features
- 0.4% Initial Voltage Tolerance: Ensures high accuracy in reference voltage.
- 0.2-Ω Typical Output Impedance: Low impedance for stable output.
- Fast Turn-on (500 ns): Quick response time for dynamic applications.
- Sink Current Capability (1 mA to 100 mA): Supports a wide range of current requirements.
- Low Reference Current (REF): Minimizes power consumption.
- Adjustable Output Voltage (VI(ref) to 36 V): Flexible voltage setting with external resistors.
- Temperature-Compensated: Maintains stability over a wide temperature range.
Applications
- Shunt Regulators: Used in voltage regulation circuits.
- Temperature-Compensated Comparators: Ideal for comparator circuits requiring stable references.
- PWM Converter Reference: Suitable for pulse-width modulation converters.
- Photodiode Reference Drivers: Used in photodiode-based circuits.
- Precision Current Limiters: For applications requiring precise current control.
- Secondary Side Regulation in Flyback SMPSs: Used in flyback switching mode power supplies.
- Voltage Monitoring: For monitoring voltage levels in various systems.
- Comparator With Integrated Reference: Combines reference and comparator functions.
Q & A
- What is the typical output impedance of the TL1431MDREP?
The typical output impedance is 0.2 Ω.
- What is the operating temperature range of the TL1431MDREP?
The operating temperature range is –55°C to 125°C.
- How can the output voltage of the TL1431MDREP be adjusted?
The output voltage can be adjusted using two external resistors.
- What is the sink current capability of the TL1431MDREP?
The device can sink current from 1 mA to 100 mA.
- What is the reference input current of the TL1431MDREP?
The reference input current is typically 4 μA.
- Can the TL1431MDREP replace Zener diodes?
Yes, it can replace Zener diodes and other types of references due to its sharp turn-on characteristic.
- What are the common applications of the TL1431MDREP?
Common applications include shunt regulators, temperature-compensated comparators, PWM converter references, and more.
- What is the initial voltage tolerance of the TL1431MDREP?
The initial voltage tolerance is 0.4%.
- How fast is the turn-on time of the TL1431MDREP?
The turn-on time is approximately 500 ns.
- What package type is the TL1431MDREP available in?
The TL1431MDREP is available in an 8-pin SOIC package.
