Texas Instruments LM5146 Handleiding

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LM5146 100-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range

1 Features

•Functional Safety-Capable

–Documentation available to aid functional safety

system design

•Versatile synchronous buck DC/DC controller

–Wide input voltage range of 5.5 V to 100 V

–150°C maximum junction temperature

–0.8-V reference with ±1% feedback accuracy

–Adjustable output voltage from 0.8 V to 60 V

–40-ns t

ON(min)

for high V

IN

/ V

OUT

ratio

–140-ns t

OFF(min)

for low dropout

–Lossless R

DS(on)

or shunt current sensing

–Optimized for CISPR 11 and CISPR 32 Class B

EMI requirements

•Switching frequency from 100 kHz to 1 MHz

–SYNC in and SYNC out capability

–Selectable diode emulation or FPWM

•7.5-V gate drivers for standard V

TH

MOSFETs

–14-ns adaptive dead-time control

–2.3-A source and 3.5-A sink capability

•Fast line and load transient response

–Voltage-mode control with line feedforward

–High gain-bandwidth error amplifier

•Inherent protection features for robust design

–Adjustable output voltage soft start

–Hiccup-mode overcurrent protection

–Input UVLO with hysteresis

–VCC and gate-drive UVLO protection

–Precision enable input and open-drain PGOOD

indicator for sequencing and control

–Thermal shutdown protection with hysteresis

•20-pin VQFN package with wettable flanks

•Create a custom design using the LM5146 with

WEBENCH

®

Power Designer

2 Applications

•Wireless infrastructure, cloud computing

•Industrial motor drives, test and measurement

•Personal transport vehicle: electric bike

•Asset tracking and fleet management systems

•Non-isolated PoE, IP cameras

•Inverting buck-boost regulators

3 Description

The LM5146 100-V synchronous buck controller

regulates from a high input voltage source or from an

input rail subject to high-voltage transients, minimizing

the need for external surge suppression components.

A high-side switch minimum on-time of 40 ns gives

large step-down ratios, enabling the direct step-down

conversion from a 48-V nominal input to low-voltage

rails for reduced system complexity and solution cost.

The LM5146 continues to operate during input voltage

dips as low as 5.5 V, at nearly 100% duty cycle

if needed, making it an excellent choice for high-

performance industrial controls, robotics, datacom,

and RF applications.

Forced-PWM (FPWM) operation eliminates switching

frequency variation to minimize EMI, while

user-selectable diode emulation lowers current

consumption at light-load conditions. The adjustable

switching frequency as high as 1 MHz can be

synchronized to an external clock source to eliminate

beat frequencies in noise-sensitive applications.

Device Information

PART NUMBERPACKAGE

(1)

BODY SIZE (NOM)

LM5146VQFN (20)4.50 mm × 3.50 mm

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

the end of the data sheet.

BST

HO

SW

VCC

PGND

RT

SS/TRK

COMP

FB

AGND

V

IN

V

OUT

LM5146

V

OUT

SYNC In

GND

PG

SYNCOUT

SYNCIN

EN/UVLOVIN

ILIM

PGOOD

SYNC Out

LO

L

F

C

OUT

Q

1

Q

2

C

IN

R

ILIM

C

VCC

C

BST

C

SS

R

FB2

R

FB1

R

C2

C

C2

C

C1

R

C1

C

C3

R

RT

ENV

IN

Typical Application Circuit and Efficiency Performance, V

OUT

= 12 V, F

SW

= 400 kHz

LM5146

SNVSBV0A – JUNE 2021 – REVISED JUNE 2021

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.

Product specificaties