LM5115MTC National Semiconductor, LM5115MTC Datasheet

LM5115MTC

Manufacturer Part Number

LM5115MTC

Description

IC,SMPS CONTROLLER,VOLTAGE-MODE,TSSOP,16PIN,PLASTIC

Manufacturer

National Semiconductor

Datasheets

1.LM5115MTC.pdf (20 pages)

2.LM5115MTC.pdf (17 pages)

Specifications of LM5115MTC

Rohs Compliant

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Download datasheet (407Kb)

LM5115A

Secondary Side Post Regulator/DC-DC Converter with

Power-up/Power-down Tracking

General Description

The LM5115A controller contains all of the features neces-

sary to produce multiple tracking outputs using the Secondary

Side Post Regulation (SSPR) technique. The SSPR tech-

nique develops a highly efficient and well regulated auxiliary

output from the secondary side switching waveform of an iso-

lated power converter. LM5115A can be also used as a

standalone DC/DC synchronous buck controller (Refer to

Synchronous Buck section). Regulation of the auxiliary

output voltage is achieved by leading edge pulse width mod-

ulation (PWM) of the main channel duty cycle. Leading edge

modulation is compatible with either current mode or voltage

mode control of the main output. The LM5115A drives exter-

nal high-side and low-side NMOS power switches configured

as a synchronous buck regulator. A current sense amplifier

provides overload protection and operates over a wide com-

mon mode input range. Additional features include a low

dropout (LDO) bias regulator, error amplifier, precision refer-

ence, adaptive dead time control of the gate signals and

thermal shutdown.

Typical Application Circuit

FIGURE 1. Simplified Multiple Output Power Converter Utilizing SSPR Technique

202071

Features

■

Power-up/Power-down Tracking

Self-synchronization to main channel output

Leading edge pulse width modulation

Valley current Mode control

Standalone DC/DC synchronous buck mode

Operates from AC or DC input up to 75V

Wide 4.5V to 30V bias supply range

Wide 0.75V to 13.5V output range.

Top and bottom gate drivers sink 2.5A peak

Adaptive gate driver dead-time control

Wide bandwidth error amplifier (4MHz)

Programmable soft-start

Thermal shutdown protection

TSSOP-16 package

20207101

www.national.com

January 2007

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