Overview
The LM2577T-12/NOPB is a monolithic integrated circuit designed by Texas Instruments, part of their SIMPLE SWITCHER® series. This device is a step-up (boost), flyback, and forward converter switching regulator, specifically configured to provide a fixed output voltage of 12V. It is known for its simplicity, requiring a minimal number of external components, making it cost-effective and easy to use. The LM2577T-12/NOPB features a 3.0A NPN output switch that can withstand up to 65V, along with built-in protection circuitry including current limiting, under-voltage lockout, and thermal shutdown.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Output Voltage | 12V | V |
| Input Voltage Range | 3.5V to 40V | V |
| Maximum Output Current | 3A | A |
| Switching Frequency | 52 kHz | Hz |
| Operating Temperature Range | -40°C to 125°C | °C |
| Package Type | TO-220-5 | |
| Topology | Boost, Flyback, Forward Converter | |
| Current Limit | 3.0A to 6.0A | A |
| Line Regulation | 20 mV to 100 mV | mV |
| Load Regulation | 20 mV to 100 mV | mV |
Key Features
- Requires few external components, making it cost-effective and simple to use.
- NPN output switch capable of handling up to 3.0A and withstanding up to 65V.
- Wide input voltage range from 3.5V to 40V.
- Current-mode operation for improved transient response, line regulation, and current limit.
- 52 kHz internal oscillator that requires no external components.
- Soft-start function to reduce in-rush current during start-up.
- Output switch protected by current limit, under-voltage lockout, and thermal shutdown.
Applications
The LM2577T-12/NOPB is versatile and can be used in various applications, including:
- Simple boost regulators.
- Flyback and forward regulators.
- Power supplies for industrial and consumer electronics.
- Battery-powered systems requiring step-up voltage conversion.
- Distributed power systems and point-of-load regulators.
Q & A
- What is the output voltage of the LM2577T-12/NOPB?
The output voltage of the LM2577T-12/NOPB is fixed at 12V.
- What is the input voltage range for the LM2577T-12/NOPB?
The input voltage range is from 3.5V to 40V.
- What is the maximum output current of the LM2577T-12/NOPB?
The maximum output current is 3A.
- What is the switching frequency of the LM2577T-12/NOPB?
The switching frequency is 52 kHz.
- What type of protection does the LM2577T-12/NOPB have?
The device has current limit, under-voltage lockout, and thermal shutdown protection.
- What is the operating temperature range of the LM2577T-12/NOPB?
The operating temperature range is from -40°C to 125°C.
- What package type is the LM2577T-12/NOPB available in?
The device is available in a TO-220-5 package.
- What topologies does the LM2577T-12/NOPB support?
The device supports boost, flyback, and forward converter topologies.
- Does the LM2577T-12/NOPB require many external components?
No, it requires a minimal number of external components.
- What is the purpose of the soft-start function in the LM2577T-12/NOPB?
The soft-start function reduces in-rush current during start-up.
