Overview
The LM3478MA/NOPB is a high-efficiency, low-side N-Channel MOSFET controller designed for switching regulators, produced by Texas Instruments. This versatile controller is suitable for various topologies such as boost, flyback, and SEPIC converters. It operates with a wide supply voltage range of 2.97 V to 40 V and supports adjustable clock frequencies from 100 kHz to 1 MHz. The LM3478MA/NOPB features current mode operation, internal soft-start, and thermal shutdown, making it a reliable and efficient solution for power management applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | SOIC-8, VSSOP-8 |
| Supply Voltage Range | 2.97 V to 40 V |
| Adjustable Clock Frequency | 100 kHz to 1 MHz |
| Peak Drive Current | 1 A |
| Operating Temperature Range | -40°C to 125°C |
| Shutdown Current | 5 µA (typical) |
| Internal Reference Accuracy | ±2.5% (over temperature) |
| Thermal Shutdown Temperature | 165°C |
| Thermal Shutdown Hysteresis | 10°C |
Key Features
- Internal Push-Pull Driver with 1-A Peak Current Capability
- Current Limit and Thermal Shutdown
- Frequency Compensation Optimized with a Capacitor and a Resistor
- Internal Soft Start
- Current Mode Operation
- Undervoltage Lockout with Hysteresis
- Overvoltage Protection
- Power-Saving Shutdown Mode (5 µA typical)
- Adjustable Frequency PWM Control
Applications
- Distributed Power Systems
- Battery Chargers
- Offline Power Supplies
- Telecom Power Supplies
- Automotive Power Systems
Q & A
- What is the supply voltage range of the LM3478MA/NOPB? The supply voltage range is from 2.97 V to 40 V.
- What are the adjustable clock frequencies for the LM3478MA/NOPB? The clock frequencies can be adjusted from 100 kHz to 1 MHz.
- What is the peak drive current of the LM3478MA/NOPB? The peak drive current is 1 A.
- What is the operating temperature range of the LM3478MA/NOPB? The operating temperature range is from -40°C to 125°C.
- Does the LM3478MA/NOPB have thermal shutdown protection? Yes, it has thermal shutdown protection at 165°C with a hysteresis of 10°C.
- What is the shutdown current of the LM3478MA/NOPB in power-saving mode? The shutdown current is 5 µA (typical).
- Does the LM3478MA/NOPB support overvoltage protection? Yes, it supports overvoltage protection.
- What types of power topologies can the LM3478MA/NOPB be used in? It can be used in boost, flyback, and SEPIC topologies.
- Does the LM3478MA/NOPB have an internal soft-start feature? Yes, it has an internal soft-start feature to limit inrush current during start-up.
- What is the internal reference accuracy of the LM3478MA/NOPB? The internal reference accuracy is ±2.5% over temperature.
