Overview
The LM2587SX-ADJ is a versatile and highly efficient DC-DC switching regulator produced by Texas Instruments (though it was originally developed by National Semiconductor, which is now part of Texas Instruments). This regulator is designed for a wide range of applications, including flyback, step-up (boost), and forward converter configurations. It is known for its simplicity, requiring a minimum number of external components, and its robust performance characteristics.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Input Voltage Range | Minimum to Maximum Input Voltage | 4 V to 40 V |
| Output Voltage Range | Minimum to Maximum Adjustable Output Voltage | 1.23 V to 60 V |
| Output Current | Maximum Switch Current | 5 A |
| Switching Frequency | Fixed Switching Frequency | 100 kHz |
| Operating Temperature Range | Junction Temperature Range | -40°C to 125°C |
| Package Type | Package and Case Type | TO-263-5, DDPAK/TO-263 |
| Topology | Supported Converter Topologies | Boost, Flyback, Forward Converter |
Key Features
- Wide Input Voltage Range: The LM2587SX-ADJ can operate with input voltages ranging from 4 V to 40 V, making it versatile for various power supply applications.
- High Current Capability: The regulator features a 5 A NPN output switch that can stand off up to 65 V.
- Current-Mode Operation: This ensures improved transient response, line regulation, and current limiting.
- Internal Soft-Start: Reduces in-rush current during startup.
- Protection Features: Includes current limit, undervoltage lockout, and thermal shutdown to protect the output transistor.
- Adjustable Output Voltage: The output voltage can be adjusted from 1.23 V to 60 V.
- Low Component Count: Requires a minimal number of external components, making it cost-effective and simple to use.
Applications
- Flyback Regulator: Suitable for flyback converter applications.
- Step-Up (Boost) Regulator: Can be used to produce an output voltage greater than the input supply voltage.
- Forward Converter: Applicable in forward converter configurations.
- Multiple-Output Regulator: Can be used in systems requiring multiple output voltages.
Q & A
- What is the input voltage range of the LM2587SX-ADJ?
The input voltage range is from 4 V to 40 V.
- What is the maximum output current of the LM2587SX-ADJ?
The maximum output current is 5 A.
- What is the switching frequency of the LM2587SX-ADJ?
The switching frequency is fixed at 100 kHz.
- What are the supported topologies for the LM2587SX-ADJ?
The supported topologies include Boost, Flyback, and Forward Converter.
- What is the operating temperature range of the LM2587SX-ADJ?
The operating temperature range is from -40°C to 125°C.
- Does the LM2587SX-ADJ have built-in protection features?
Yes, it includes current limit, undervoltage lockout, and thermal shutdown.
- How does the LM2587SX-ADJ reduce in-rush current during startup?
It features an internal soft-start function to reduce in-rush current during startup.
- What is the typical output voltage tolerance of the LM2587SX-ADJ?
The output voltage tolerance is ±4% over specified input voltages and output load conditions.
- Can the LM2587SX-ADJ be used in multiple-output regulator configurations?
Yes, it can be used in systems requiring multiple output voltages.
- What package types are available for the LM2587SX-ADJ?
The available package types include TO-263-5 and DDPAK/TO-263.
