Overview
The TL1431MDREPG4 is a precision programmable reference device produced by Texas Instruments. It is part of the TL1431 series, known for its thermal stability over automotive, commercial, and military temperature ranges. This device is highly versatile and can be used in a variety of applications, including onboard regulation, adjustable power supplies, and switching power supplies. The TL1431MDREPG4 is characterized for operation over the full military temperature range of –55°C to 125°C, making it suitable for demanding environments.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VI(ref) - Reference Input Voltage | TA = 25°C | 2475 | 2500 | 2540 | mV |
| VI(ref) - Reference Input Voltage | TA = –55°C to 125°C | 2460 | 2550 | mV | |
| VI(dev) - Deviation of Reference Input Voltage | TA = –55°C to 125°C | 17 | 55 | mV | |
| II(ref) - Reference Input Current | TA = 25°C, R1 = 10 kΩ, R2 = ∞ | 1.5 | 2.5 | µA | |
| II(dev) - Deviation of Reference Input Current | TA = –55°C to 125°C, R1 = 10 kΩ, R2 = ∞ | 0.5 | 2 | µA | |
| Imin - Minimum Cathode Current for Regulation | TA = 25°C, VKA = VI(ref) | 0.45 | 1 | mA | |
| Ioff - Off-state Cathode Current | TA = 25°C, VKA = 36 V, VI(ref) = 0 | 0.18 | 0.5 | µA | |
| |zKA| - Output Impedance | TA = 25°C, f ≤ 1 kHz, IKA = 1 mA to 100 mA | 0.2 | 0.4 | Ω | |
| VKA - Adjustable Output Voltage | 2.5 | 36 | V |
Key Features
- 0.4% Initial Voltage Tolerance: High accuracy in the reference voltage.
- 0.2-Ω Typical Output Impedance: Low impedance for stable output.
- Fast Turnon (500 ns): Quick response time for dynamic applications.
- Sink Current Capability (1 mA to 100 mA): Versatile current handling.
- Low Reference Current (REF): Efficient operation with minimal current draw.
- Adjustable Output Voltage (VI(ref) to 36 V): Flexible voltage setting with external resistors.
- Internal Compensation for Stability: No need for an external output capacitor for stability.
Applications
- Adjustable Voltage and Current Referencing: Suitable for applications requiring precise voltage or current references.
- Secondary Side Regulation in Flyback SMPSs: Used in switching power supplies for efficient regulation.
- Zener Replacement: Can replace Zener diodes in many applications due to its adjustable output voltage.
- Voltage Monitoring: Ideal for monitoring voltage levels in various systems.
- Comparator With Integrated Reference: Functions as a comparator with an integrated reference voltage.
Q & A
- What is the temperature range for the TL1431MDREPG4?
The TL1431MDREPG4 is characterized for operation over the full military temperature range of –55°C to 125°C.
- What is the typical output impedance of the TL1431MDREPG4?
The typical output impedance is 0.2 Ω.
- What is the minimum cathode current required for regulation?
The minimum cathode current required for regulation is 0.45 mA.
- Can the TL1431MDREPG4 be used as a comparator?
Yes, the TL1431MDREPG4 can be used as a comparator in open-loop configuration.
- How is the output voltage of the TL1431MDREPG4 adjusted?
The output voltage can be adjusted using two external resistors.
- What is the maximum sink current capability of the TL1431MDREPG4?
The maximum sink current capability is 100 mA.
- Does the TL1431MDREPG4 require an external output capacitor for stability?
No, the TL1431MDREPG4 is internally compensated and does not require an external output capacitor for stability.
- What are some common applications of the TL1431MDREPG4?
Common applications include adjustable voltage and current referencing, secondary side regulation in flyback SMPSs, Zener replacement, voltage monitoring, and as a comparator with integrated reference.
- What is the reference input voltage of the TL1431MDREPG4 at 25°C?
The reference input voltage at 25°C is approximately 2500 mV.
- What is the off-state cathode current of the TL1431MDREPG4?
The off-state cathode current is typically 0.18 µA at 25°C.
