Texas Instruments LM5005 Bedienungsanleitung

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LM5005 75V, 2.5A Step-Down Switching Regulator With Wide Input Voltage Range

1 Features

•High-efficiency DC-DC buck converter

–Wide input voltage range: from 7V to 75V

–Adjustable output voltage: as low as 1.225V

–Output current: as high as 2.5A

–Junction temperature range –40°C to 125°C

•Integrated 75V, 160mΩ buck MOSFET

•Meets EN55022 and CISPR 22 EMI standards

•Feedback voltage accuracy: ±1.5%

•Emulated peak current-mode control

–Ultra-fast line and load transient response

•Switching frequency: from 50kHz to 500kHz

•Controller or peripheral frequency synchronization

input

•80ns minimum PWM ON time for low V

OUT

•Monotonic start-up into prebiased output

•Internal high-voltage VCC bias supply regulator

•Auxiliary bias supply option to VCC

•Configurable soft start with tracking

•Precision standby and shutdown input

–Programmable input UVLO with hysteresis

•Remote shutdown and standby control

•Cycle-by-cycle overcurrent protection

•VCC and gate drive UVLO protection

•Thermal shutdown protection with hysteresis

•Thermally-enhanced 20-pin HTSSOP package

•Create a custom design using the LM5005 with the

WEBENCH

®

Power Designer

2 Applications

•High-efficiency point-of-load regulators

•Telecommunications infrastructure

•Factory automation and control

3 Description

The LM5005 high-voltage buck converter features all

of the functions necessary to implement an efficient

high-voltage switching regulator with a minimum

number of external components. This easy-to-use

converter operates over an input voltage range

from 7V to 75V and delivers a maximum output

current of 2.5A. The control loop architecture is

based upon current-mode control using an emulated

current ramp for high noise immunity. Current-mode

control provides inherent line feed-forward, cycle-by-

cycle overcurrent protection and straightforward loop

compensation. The use of an emulated control ramp

reduces noise sensitivity of the PWM circuit, allowing

reliable control of small duty cycles necessary in high

input voltage applications.

The switching frequency is resistor-programmable

from 50kHz to 500kHz. To reduce EMI, an oscillator

synchronization pin allows multiple LM5005 regulators

to self-synchronize or be synchronized to an external

clock signal. Additional protection features include

configurable soft start, external power supply tracking,

thermal shutdown with automatic recovery, and

remote shutdown capability.

The LM5005 is available in an 20-pin HTSSOP

package with an exposed pad that is soldered to

the PCB to achieve a low junction-to-board thermal

impedance. To create a custom regulator design, use

the LM5005 with WEBENCH

®

Power Designer.

Package Information

PART NUMBERPACKAGE

(1)

PACKAGE SIZE

(2)

LM5005PWP (HTSSOP, 20)6.50mm × 4.40mm

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

the end of the data sheet.

(2)The package size (length × width) is a nominal value and

includes pins, where applicable.

FB

V

IN

LM5005

V

OUT

AGND

COMP

VIN

SYNC

SW

SD

L

F

R

C1

C

C1

C

C2

R

FB1

R

FB2

PGND

VCC

5

17,18

2

7

6

10

13,14

3,4

SS

C

SS

11

C

IN

C

OUT

optional

C

VCC

1

IS

15,16

RT

R

T

8

C

RAMP

RAMP

9

C

BST

OUT

12

BST

20

D

F

PRE

19

optional

SYNC

Copyright © 2016, Texas Instruments Incorporated

Typical Application Circuit

Output Current (A)

Efficiency ()

00.511.522.5

20

30

40

50

60

70

80

90

100

D001

VIN = 12 V

VIN = 24 V

VIN = 36 V

VIN = 48 V

VIN = 60 V

VIN = 75 V

Typical Efficiency, V

OUT

= 5V

LM5005

SNVS397F – SEPTEMBER 2005 – REVISED DECEMBER 2025

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.

Produktspezifikationen