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Texas Instruments LM3481 | Demoboard PMP8638
LM3481 / -Q1 High-Efficiency Controller for Boost, SEPIC and Flyback DC-DC Converters
Overview
| Topology | Flyback Converter |
| Input voltage | 21-265 V |
| IC revision | 1 |
Description
The LM3481 device is a versatile Low-Side N-FET high-performance controller for switching regulators. The device is designed for use in Boost, SEPIC and Flyback converters and topologies requiring a lowside FET as the primary switch. The LM3481 device can be operated at very high switching frequencies to reduce the overall solution size. The switching frequency of the LM3481 device can be adjusted to any value between 100kHz and 1MHz by using a single external resistor or by synchronizing it to an external clock. Current mode control provides superior bandwidth and transient response in addition to cycle-by-cycle current limiting. Current limit can be programmed with a single external resistor. The LM3481 device has built-in protection features such as thermal shutdown, short-circuit protection and overvoltage protection. Power-saving shutdown mode reduces the total supply current to 5 µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up. Integrated current slope compensation simplifies the design and, if needed for specific applications, can be increased using a single resistor.
Features
- LM3481QMM are Automotive-Grade Products That are AEC-Q100 Grade 1 Qualified (–40°C to +125°C Operating Junction Temperature)
- 10-Lead VSSOP Package
- 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 Softstart
- Current Mode Operation
- Adjustable Undervoltage Lockout With Hysteresis
- Pulse Skipping at Light Loads
- Key Specifications
- Wide Supply Voltage Range of 2.97 V to 48 V
- 100-kHz to 1-MHz Adjustable and Synchronizable Clock Frequency
- ±1.5% (Over Temperature) Internal Reference
- 10-µA Shutdown Current (Over Temperature)
- Create a Custom Design Using the LM3481 with the WEBENCH Power Designer
Typical applications
- Automotive ADAS Driver Information, One Cell/Two Cell Li-ion Battery Powered Portable Bluetooth Audio Systems, Offline Power Supplies, Boost for Audio Amplifiers
- Automotive Start-Stop Applications
- Notebooks, PDAs, Digital Cameras, and Other Portable Application, Set-Top Boxes
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | ISAT(A) | fres(MHz) | IR(A) | L(µH) | RDC max.(Ω) | VR(V (AC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-TI HV Radial Leaded Wire Wound Inductor (High Voltage), 0.55 A, 1.8 MHz | Status Activei| Production is active. Expected lifetime: >10 years. | Saturation Current0.55 A | Self Resonant Frequency1.8 MHz | Rated Current0.5 A | Inductance1000 µH | DC Resistance2.08 Ω | – | – | MaterialNiZn | Length7.8 mm | Width7.8 mm | Height9.5 mm | MountTHT | |||||
 | WE-CMB Common Mode Power Line Choke, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CMB Common Mode Power Line Choke | – | – | Rated Current0.5 A | Inductance20000 µH | DC Resistance1 Ω | Rated Voltage250 V (AC) | Insulation Test Voltage1500 V (AC) | MaterialMnZn | Length15 mm | Width7.8 mm | Height17.5 mm | MountTHT | ||||
750314160 | Flyback Transformer, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Flyback Transformer | – | – | – | – | – | – | – | – | – | – | – | – |