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TI LM5117/ Controller with Analog Current Monitor ic-stocks

  • 저자:salmon ye
  • 출처:www.ic-stocks.com
  • 출시일:2018-11-29

General Description

The LM5117 is a synchronous buck controller intended forstep-down regulator applications from a high voltage or widelyvarying input supply. The control method is based upon currentmode control utilizing an emulated current ramp.

Currentmode control provides inherent line feed-forward, cycle-bycyclecurrent limiting and ease of loop compensation. The useof an emulated control ramp reduces noise sensitivity of thepulse-width modulation circuit, allowing reliable control ofvery small duty cycles necessary in high input voltage applications.

The operating frequency is programmable from 50 kHz to 750kHz. The LM5117 drives external high-side and low-sideNMOS power switches with adaptive dead-time control. A user-selectablediode emulation mode enables discontinuousmode operation for improved efficiency at light load conditions.

A high voltage bias regulator that allows external biassupply further improves efficiency. The LM5117’s unique analogtelemetry feature provides average output current information.Additional features include thermal shutdown, frequencysynchronization, hiccup mode current limit andadjustable line under-voltage lockout.


Features

■ LM5117Q is an Automotive Grade product that is AECQ100grade 1 qualified (-40°C to +125°C operatingjunction temperature)

■ Emulated peak current mode control

■ Wide operating range from 5.5V to 65V

■ Robust 3.3A peak gate drives

■ Adaptive dead-time output driver control

■ Free-run or synchronizable clock up to 750kHz

■ Optional diode emulation mode

■ Programmable output from 0.8V

■ Precision 1.5% voltage reference

■ Analog current monitor

■ Programmable current limit

■ Hiccup mode over current protection

■ Programmable soft-start and tracking

■ Programmable line under-voltage lockout

■ Programmable switch-over to external bias supply

■ Thermal shutdown

Packages

■ TSSOP-20EP (Thermally enhanced)

■ LLP-24 (4mmx4mm)


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