Overview
The TL431ACLPME3 is a precision programmable shunt regulator produced by Texas Instruments. This device is part of the TL431 series, known for its adjustable output voltage and high thermal stability. The TL431ACLPME3 is a three-terminal adjustable shunt regulator that can be used in a variety of applications requiring precise voltage regulation.
It operates over a wide temperature range, making it suitable for automotive, commercial, and military applications. The device can be set to any output voltage between approximately 2.5V and 36V using two external resistors, providing flexibility in design.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Voltage Tolerance at 25°C | - | - | 1% (A Grade) | % |
| Adjustable Output Voltage | 2.5 | - | 36 | V |
| Operating Temperature Range | -40 | - | 125 | °C |
| Typical Temperature Drift | - | 6 mV (C Temp), 14 mV (I Temp, Q Temp) | - | mV |
| Output Impedance | - | 0.2 Ω | - | Ω |
| Sink-Current Capability | 1 mA | - | 100 mA | mA |
| Cathode Voltage (VKA) | - | - | 37 V | V |
| Reference Input Current (Iref) | -0.05 mA | - | 10 mA | mA |
Key Features
- Adjustable Output Voltage: The output voltage can be set to any value between approximately 2.5V and 36V using two external resistors.
- High Thermal Stability: Operates over a wide temperature range from -40°C to 125°C, ensuring stability in various environmental conditions.
- Low Output Noise: Features low output noise, making it suitable for applications requiring minimal noise.
- Low Output Impedance: Typical output impedance of 0.2 Ω, which is beneficial for maintaining voltage stability.
- Sink-Current Capability: Can sink currents from 1 mA to 100 mA, providing flexibility in current handling.
- Sharp Turn-On Characteristic: Active output circuitry provides a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
Applications
- Rack Server Power: Used in power supplies for rack servers due to its high thermal stability and adjustable output voltage.
- Industrial AC/DC and AC Inverter & VF Drives: Suitable for industrial power supplies and drive systems requiring precise voltage regulation.
- Servo Drive Control Module: Used in servo drive control modules for precise voltage referencing.
- Notebook PC Power Adapter Design: Employed in power adapter designs for notebooks due to its compact size and adjustable output voltage.
- Zener Replacement: Often used as a replacement for Zener diodes in various applications due to its sharp turn-on characteristic and adjustable output voltage.
- Secondary Side Regulation in Flyback SMPSs: Used in secondary side regulation of flyback switching mode power supplies (SMPSs).
Q & A
- What is the TL431ACLPME3 used for?
The TL431ACLPME3 is a precision programmable shunt regulator used for voltage regulation in various applications, including power supplies, servo drive control modules, and as a replacement for Zener diodes.
- What is the adjustable output voltage range of the TL431ACLPME3?
The output voltage can be set to any value between approximately 2.5V and 36V using two external resistors.
- What are the operating temperature ranges for the TL431ACLPME3?
The device operates from -40°C to 125°C, making it suitable for automotive, commercial, and military applications.
- What is the typical output impedance of the TL431ACLPME3?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431ACLPME3?
The device can sink currents from 1 mA to 100 mA.
- Why is the TL431ACLPME3 preferred over Zener diodes in some applications?
It is preferred due to its sharp turn-on characteristic, adjustable output voltage, and low output noise.
- What are some common applications of the TL431ACLPME3?
Common applications include rack server power, industrial AC/DC and AC inverter & VF drives, servo drive control modules, and notebook PC power adapter designs.
- How does the TL431ACLPME3 handle temperature drift?
The device has a low temperature drift, with typical values of 6 mV (C Temp) and 14 mV (I Temp, Q Temp).
- What is the reference voltage tolerance of the TL431ACLPME3 at 25°C?
The reference voltage tolerance is 1% for the A Grade.
- What packages are available for the TL431ACLPME3?
The device is available in various packages, including SOT-23-3, SOT-23-5, SOIC, PDIP, and SOP.
