Texas Instruments LM25119 | Demoboard LM25119 AN-2065

Description

The LM25119 device is a dual synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control using an emulated current ramp. Current mode control provides inherent line feedforward, cycle-by-cycle current limiting and ease-of-loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The switching frequency is programmable from 50 kHz to 750 kHz. The LM25119 device drives external high-side and low-side N-channel MOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved

Features

• Emulated Peak Current Mode Control
• Wide Operating Range (4.5 V to 42 V)
• Easily Configurable for Dual Outputs or Interleaved Single Output
• Robust 3.3-A Peak Gate Drive
• Switching Frequency Programmable to 750 kHz
• Optional Diode Emulation Mode
• Programmable Output From 0.8 V
• Precision 1.5% Voltage Reference
• Programmable Current Limit

Typical applications

• Industrial DC-DC Motor Drivers
• Telecom Servers and Routers

More information

• Datasheet
• IC product information