Overview
The LM2577S-ADJ/NOPB is a monolithic integrated circuit designed by Texas Instruments, serving as a versatile step-up (boost), flyback, and forward converter switching regulator. This device is part of the SIMPLE SWITCHER family and is known for its simplicity and cost-effectiveness. It requires a minimum number of external components, making it easy to integrate into various power supply designs. The LM2577S-ADJ/NOPB is available in an adjustable output voltage version, allowing for flexible application in different systems.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | TO-263 (KTT) | 5 pins |
| Operating Temperature Range | -40°C to 125°C | |
| Input Voltage Range | 3.5V to 40V | |
| Output Switch Current | 3.0A | |
| Output Voltage Versions | 12V, 15V, and adjustable | |
| Oscillator Frequency | 52 kHz | |
| Efficiency | Up to 80% at VIN = 5V, ILOAD = 800 mA | |
| Current Limit | 3.7A to 6.0A | |
| Undervoltage Lockout | 2.7V to 3.1V |
Key Features
- Requires few external components, making it cost-effective and simple to use.
- NPN output switch capable of handling 3.0A and standing off 65V.
- Wide input voltage range: 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
- Simple boost regulators.
- Flyback and forward regulators.
- Power supply systems requiring step-up, flyback, or forward conversion.
- Industrial and consumer electronics where efficient and reliable power conversion is necessary.
Q & A
- What is the input voltage range of the LM2577S-ADJ/NOPB?
The input voltage range is from 3.5V to 40V.
- What are the available output voltage versions for the LM2577S-ADJ/NOPB?
The device is available in 12V, 15V, and adjustable output voltage versions.
- What is the maximum current handling capability of the output switch?
The output switch can handle up to 3.0A and stand off 65V.
- What is the oscillator frequency of the LM2577S-ADJ/NOPB?
The oscillator frequency is 52 kHz.
- Does the LM2577S-ADJ/NOPB have built-in protection features?
- What is the efficiency of the LM2577S-ADJ/NOPB at typical operating conditions?
The efficiency can be up to 80% at VIN = 5V and ILOAD = 800 mA.
- What is the operating temperature range of the LM2577S-ADJ/NOPB?
The operating temperature range is from -40°C to 125°C.
- What package type is the LM2577S-ADJ/NOPB available in?
The device is available in a TO-263 (KTT) package with 5 pins.
- Does the LM2577S-ADJ/NOPB require many external components?
No, it requires a minimum number of external components, making it simple to use.
- What is the purpose of the soft-start function in the LM2577S-ADJ/NOPB?
The soft-start function reduces in-rush current during start-up.
