Texas Instruments LM5149 Bruksanvisning

Läs gratis den bruksanvisning för Texas Instruments LM5149 (72 sidor) i kategorin ej kategoriserat. Guiden har ansetts hjälpsam av 2 personer och har ett genomsnittsbetyg på 4.6 stjärnor baserat på 7 recensioner. Har du en fråga om Texas Instruments LM5149 eller vill du ställa frågor till andra användare av produkten? Ställ en fråga

LM5149 80-V, Synchronous, Buck, DC/DC Controller with Ultra-Low I

Q

and Integrated

Active EMI Filter

1 Features

•Functional Safety-Capable

–Documentation available to aid functional safety

system design

•Two integrated EMI mitigation mechanisms

–Active EMI Filter for enhanced EMI

performance at lower frequencies

–Selectable dual random spread spectrum

(DRSS) for enhanced EMI performance across

low and high-frequency bands

–EMI reduced by an average of 25 dBµV

–Reduces the external differential-mode input

filter size by 50% and lowers systems cost

–Optimized for CISPR 32 Class B requirements

•Versatile synchronous buck DC/DC controller

–Wide input voltage range of 3.5 V to 80 V

–1% accurate, fixed 3.3 V, 5 V, 12 V, or

adjustable output from 0.8 V to 55 V

–150°C maximum junction temperature

–Shutdown mode current: 2.3 µA

–No-load sleep current: 9.5 µA

–Stackable up to two phases

–Advanced dropout with frequency foldback

•Switching frequency from 100 kHz to 2.2 MHz

–SYNC in and SYNC out capability

•Inherent protection features for robust design

–Internal hiccup-mode overcurrent protection

–ENABLE and PGOOD functions

–VCC, VDDA, and gate-drive UVLO protection

–Internal or external loop compensation

–Thermal shutdown protection with hysteresis

•Create a custom design using the LM5149 with

WEBENCH

®

Power Designer

2 Applications

•Building automation

•Industrial transport

•Wireless infrastucture

•Test and measurement

3 Description

The LM5149 is a 80-V, ultra-low I

Q

synchronous

buck DC/DC controller for high-current, single-output

applications. The controller uses a peak current-mode

control architecture for easy loop compensation,

fast transient response, and excellent load and line

regulation. The LM5149 can be set up in interleaved

dual-phase mode with accurate current sharing for

high-current applications. The device can operate with

V

IN

as low as 3.5 V, at nearly 100% duty cycle if

needed.

The LM5149 has two unique EMI reduction features:

active EMI filterand dual random spread spectrum

(DRSS). The active EMI filter senses any noise

or ripple voltage on the DC input bus and injects

an out-of-phase cancellation signal to reduce the

disturbance. DRSS combines low-frequency triangular

and high-frequency randomized modulations to

mitigate EMI across lower and higher frequency

bands, respectively. This hybrid technique aligns with

the multiple resolution bandwidth (RBW) settings

specified in industry-standard EMC tests.

Package Information

PART NUMBERPACKAGE

(1)

BODY SIZE (NOM)

LM5149RGY (VQFN, 24)3.50 mm × 5.50 mm

(1)For all available packages, see the orderable addendum at

the end of the data sheet

PFM/SYNC

REFAGND

AVSS

CNFG

INJ

SENSE

AEFVDDA

PG/SYNCOUT

AGND

RT

VDDA

PGND

VOUT

ISNS+

LO

SW

HO

CBOOT

VIN

VCC

EN

EXTCOMP

FB

V

OUT

= 5 V

I

OUT

= 8 A

* V

OUT

tracks V

IN

if V

IN

< 5.2 V

R

RT

C

VDDA

C

VCC

C

BOOT

C

IN

C

O

R

S

L

O

Q

1

Q

2

4 47



F

5 m



0.68



H

0.1



F

2.2



F

V

IN

= 5.5 V...36 V

9.52 k



0.1



F

R

FB

24.9 k



3  10



F

R

CNFG

24.9 k



R

COMP

10 k



C

HF

N/A

C

COMP

2.7 nF

L

IN

0.68 µH

R

AEFVDD

3



C

AEFVDD

VCC

2.2



F

R

DAMP

3



R

INC

0.47



R

AEFDC

49.9 k



C

INC

0.1



F

C

INJ

0.47



F

C

SEN

0.1



F

R

AEFC

200



C

AEFC

1 nF

C

DAMP1

47



F

LM5149

VDDA

To AEF

sense point

VCCX

Tie to V

OUT

or GND

Typical Application Schematic

Start 150 kHzStop 30 MHz

Peak

Average

CISPR 25 Class 5 Peak

CISPR 25 Class 5 Average

CISPR 25 EMI Performance - 150 kHz to 30 MHz

LM5149

SNVSBV4A – DECEMBER 2020 – REVISED JANUARY 2023

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Produktspecifikationer