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 22
Download datasheet (418Kb)

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 voltage

buck regulator using a minimum of external components. 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 in-

herent 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 nec-

essary in high input voltage applications. The operating fre-

quency is programmable from 50kHz to 500kHz. An oscillator

synchronization pin allows multiple LM5005 regulators to self-

synchronize or to be synchronized to an external clock. Ad-

ditional protection features include: current limit, thermal

shutdown and remote shutdown 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

201619

Features

■

Package

■

Integrated 75V, 2.5A N-Channel Buck Switch

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

Internal high voltage bias regulator

Adjustable output voltage from 1.225V

1.5% feedback reference accuracy

Current mode control with emulated inductor current ramp

Single resistor oscillator frequency setting

Oscillator synchronization input

Programmable soft-start

Shutdown / Standby input

Wide bandwidth error amplifier

Thermal Shutdown

TSSOP-20EP (Exposed Pad)

20161901

www.national.com

March 2006

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