Overview
The LM2576S-12/NOPB is a monolithic integrated circuit designed by Texas Instruments, serving as a step-down (buck) switching regulator. This device is capable of driving a 3-A load with excellent line and load regulation. It is available in a fixed output voltage of 12V and is part of the LM2576 series, which also includes other fixed output voltages such as 3.3V, 5V, 15V, and an adjustable output version. The LM2576S-12/NOPB is known for its high efficiency, simplicity in design, and minimal requirement for external components, making it a versatile solution for various power supply applications.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage Range (Vin) | 4V to 40V (up to 60V for HV version) |
| Output Voltage (Vout) | 12V (fixed) |
| Maximum Output Current (Iout) | 3A |
| Operating Temperature Range | -40°C to 125°C |
| Package Type | TO-263-5 |
| Number of Pins | 5 |
| Oscillator Frequency | 52 kHz (fixed) |
| Output Voltage Tolerance | ±4% over line and load conditions |
| Standby Current | 50 µA (typical) |
Key Features
- High-efficiency step-down switching regulator
- Fixed output voltage of 12V with ±4% tolerance over line and load conditions
- Maximum output current of 3A
- Wide input voltage range: 4V to 40V (up to 60V for HV version)
- Requires only four external components
- 52-kHz fixed-frequency internal oscillator
- TTL-shutdown capability and low-power standby mode
- Cycle-by-cycle current limiting and thermal shutdown for fault protection
- Uses readily available standard inductors
Applications
The LM2576S-12/NOPB is suitable for a variety of power supply applications where high efficiency and reliability are crucial. It can be used in systems requiring a stable 12V output voltage from a wide range of input voltages. Typical applications include:
- Power supplies for electronic devices
- DC-DC converters
- Industrial control systems
- Automotive systems
- Telecommunication equipment
Q & A
- Q: What is the maximum output current of the LM2576S-12/NOPB?
A: The LM2576S-12/NOPB can provide a maximum output current of 3A. - Q: What is the fixed output voltage of the LM2576S-12/NOPB?
A: The fixed output voltage is 12V. - Q: What is the input voltage range for the LM2576S-12/NOPB?
A: The input voltage range is from 4V to 40V (up to 60V for HV version). - Q: Does the LM2576S-12/NOPB require additional heatsinking?
A: Heatsinking may be required based on the specific application and load conditions to ensure optimal thermal performance. - Q: What is the oscillator frequency of the LM2576S-12/NOPB?
A: The oscillator frequency is 52 kHz (fixed). - Q: What is the standby current of the LM2576S-12/NOPB?
A: The standby current is 50 µA (typical). - Q: How many external components are required for the LM2576S-12/NOPB?
A: Only four external components are required. - Q: What type of package does the LM2576S-12/NOPB come in?
A: The LM2576S-12/NOPB comes in a TO-263-5 package. - Q: What is the operating temperature range for the LM2576S-12/NOPB?
A: The operating temperature range is -40°C to 125°C. - Q: Does the LM2576S-12/NOPB have fault protection features?
A: Yes, it includes cycle-by-cycle current limiting and thermal shutdown for fault protection.
