Overview
The LM134H/NOPB is a 3-terminal adjustable current source produced by Texas Instruments. This device is part of the LM134/LM234/LM334 family, known for its wide dynamic voltage range and high current regulation accuracy. The LM134H/NOPB operates from 1V to 40V and can be programmed to deliver currents from 1μA to 10mA with a simple external resistor connection. It is available in a TO hermetic package and is suitable for various applications requiring precise current control.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Operating Voltage Range | 1 | - | 40 | V |
| Set Current Range | 1μA | - | 10mA | - |
| Current Regulation | - | 0.02% | - | %/V |
| Initial Current Accuracy | - | ±3% | - | - |
| Operating Temperature Range | -55°C | - | 125°C | °C |
| Power Dissipation | - | - | 400mW | mW |
| ESD Susceptibility | - | - | 2000V | V |
Key Features
- True 2-terminal operation with no separate power supply connections.
- Wide dynamic voltage range from 1V to 40V.
- High current regulation accuracy with 0.02%/V regulation.
- Programmable current from 1μA to 10mA using a single external resistor.
- Available as fully specified temperature sensors with ensured initial accuracy.
- Reverse applied voltages up to 20V draw only a few dozen microamperes of current.
- Low noise characteristics, with current noise approximately 4 times the shot noise of a transistor.
- Zero drift operation achievable with additional external components.
Applications
- Bias networks and surge protection circuits.
- Low power reference and ramp generation.
- LED drivers and temperature sensing applications.
- Remote sense applications where series resistance in long wire runs does not affect accuracy.
- AC applications where the device can act as both a rectifier and current source.
Q & A
- What is the operating voltage range of the LM134H/NOPB?
The LM134H/NOPB operates from 1V to 40V.
- How is the set current programmed in the LM134H/NOPB?
The set current is programmed using a single external resistor.
- What is the current regulation accuracy of the LM134H/NOPB?
The current regulation accuracy is 0.02%/V.
- What is the initial current accuracy of the LM134H/NOPB?
The initial current accuracy is ±3%.
- What are the operating temperature ranges for the LM134H/NOPB?
The operating temperature range is from -55°C to 125°C.
- How does the LM134H/NOPB handle reverse applied voltages?
Reverse applied voltages up to 20V draw only a few dozen microamperes of current.
- Can the LM134H/NOPB be used in AC applications?
Yes, it can act as both a rectifier and current source in AC applications.
- How can the temperature coefficient of the LM134H/NOPB be minimized?
The temperature coefficient can be minimized by adding a diode and a resistor to the standard configuration.
- What are some common applications of the LM134H/NOPB?
Common applications include bias networks, surge protection, low power reference, ramp generation, LED drivers, and temperature sensing.
- What is the ESD susceptibility of the LM134H/NOPB?
The ESD susceptibility is 2000V.
