LM5005MH National Semiconductor, LM5005MH Datasheet

LM5005MH

Manufacturer Part Number

LM5005MH

Description

IC, BUCK REGULATOR, TSSOP-20

Manufacturer

National Semiconductor

Datasheets

1.LM5005MH.pdf (22 pages)

2.LM5005MH.pdf (21 pages)

3.LM5005MH.pdf (21 pages)

Specifications of LM5005MH

Primary Input Voltage

75V

No. Of Outputs

Output Voltage

1.225V

Output Current

2.5A

No. Of Pins

Operating Temperature Range

-40Â°C To +125Â°C

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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Current page: 1 of 21
Download datasheet (772Kb)

LM5005

High Voltage 2.5 Amp Buck Regulator

General Description

The LM5005 high voltage switching regulator features all of

the functions necessary to implement an efficient high volt-

age buck regulator using a minimum of external compo-

nents. This easy to use regulator includes a 75V N-Channel

buck switch with an output current capability of 2.5 Amps.

The regulator control method is based upon current mode

control utilizing an emulated current ramp. Current mode

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

current limiting and ease of loop compensation. The use of

an emulated control ramp reduces noise sensitivity of the

pulse-width modulation circuit, allowing reliable control of

very small duty cycles necessary in high input voltage appli-

cations. The operating frequency is programmable from

50kHz to 500kHz. An oscillator synchronization pin allows

multiple LM5005 regulators to self-synchronize or to be syn-

chronized to an external clock. Additional protection features

include: current limit, thermal shutdown and remote shut-

down capability. The device is available in a power enhanced

TSSOP-20 package featuring an exposed die attach pad to

aid thermal dissipation.

Simplified Application Schematic

DS201619

Features

n Integrated 75V, 2.5A N-Channel Buck Switch

n Ultra-wide input voltage range from 7V to 75V

n Internal high voltage bias regulator

n Adjustable output voltage from 1.225V

n 1.5% feedback reference accuracy

n Current mode control with emulated inductor current

n Single resistor oscillator frequency setting

n Oscillator synchronization input

n Programmable soft-start

n Shutdown / Standby input

n Wide bandwidth error amplifier

n Thermal Shutdown

Package

n TSSOP-20EP (Exposed Pad)

ramp

20161901

September 2005

www.national.com

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