TI LM25119PSQE/NOPB

降压降压4.5V ~ 42V

Overview

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The LM25119 device is a dual synchronous buck controller intendedfor step-down regulator applications from a high voltage or widely varying input supply. Thecontrol method is based upon current mode control using an emulated current ramp. Current modecontrol provides inherent line feedforward, cycle-by-cycle current limiting and ease-of-loopcompensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-widthmodulation circuit, allowing reliable control of very small duty cycles necessary in high inputvoltage applications. The switching frequency is programmable from 50 kHz to 750 kHz. TheLM25119 device drives external high-side and low-side N-channel MOS powerswitches with adaptive dead-time control. A user-selectable diode emulation mode enablesdiscontinuous mode operation for improved efficiency at light load conditions. A high voltage biasregulator with automatic switch-over to external bias further improves efficiency. Additionalfeatures include thermal shutdown, frequency synchronization, cycle-by-cycle and hiccup modecurrent limit and adjustable line undervoltage lockout. The device is available in a power enhancedleadless 32-pin WQFN package featuring an exposed die attach pad to aid thermaldissipation.

Features

Tape & Reel (TR) Package
Transistor Driver Outputs
Switching Frequency: 50kHz~750kHz
Enable, Frequency Control, Ramp, Reset, Soft Start
PULSE WIDTH MODULATION
PROGRAMMABLE OUTPUT FROM 0.8 V

Surface Mount Mounting Type

Applications

There are a lot of Texas Instruments
LM25119PSQE/NOPB DC to DC converter applications.

• CNC system
• Servo drive system
• Digital display device
• Linear guide
• Ball screw pair
• Computer application technology
• Network technology
• Automation technology
• CMM
• Various precision measuring instruments