Electrical Description

TheSIL/SMT80C2isimplementedusingamulti-phasesynchronousbucktopology.Ablockdiagramof

theconverterisshowninFigure1.

Theoutputisadjustableoverarangeof

0.8375-5.1Vbyusingaresistorfromthetrimpin

to-trimpin,orbydrivingtheTRIMpinwitha

voltage.

Theconvertercanbeshutdownviatheenable

pin.Thisinputisrunwithpositivelogicthatis

compatiblewithpopularlogicdevices.Positive

logicimpliesthattheconverterisenabledifthe

inputishigh(orfloating),anddisabledifitislow.

Outputismonitoredforovercurrentandshort-

circuitconditions.WhenthePWMcontroller

detectsanovercurrentcondition,itforcesthe

moduleintohiccupmode.

AtypicalapplicationisshowninFigure2.

Wide Operating Temperature Range

TheSIL/SMT80C2'sabilitytoaccommodateawide

rangeofambienttemperaturesistheresultofits

extremelyhighpowerconversionefficiencyand

resultantlowpowerdissipation,combinedwiththe

excellentthermalperformanceofthePCBsubstrate.

Maximumoutputpowerthatthemodulecandeliver

dependsonanumberofparameters,primarily:

• Input voltage range

• Outputloadcurrent

• Air velocity (forced or natural convection)

• MountingorientationoftargetapplicationPCB,i.e.,vertical/horizontalmount,ormechanicallytied

down (especially important in natural convection conditions).

• TargetapplicationPCBdesign,especiallygroundplanes.Thesecanbeeffectiveheatsinksforthecon-

verter.

TheSIL/SMT80C2modulehasanoperatingtemperaturerangeof0°Cto85°Cwithsuitablederatingand/

or forced air cooling.

Ilimit

Lout

V out

GND

Remote

ON/OFF

PWRGD

Trim

Vout

Vin

Phase 1

Phase 2

Upper G/Drive

Upper G/Drive

Lower G/Drive

Lower G/Drive

1

∩∩∩

∩∩∩

Lout2

Phase 3

Upper G/Drive

Lower G/Drive

∩∩∩

Lout3

Phase 4

Upper G/Drive

Lower G/Drive

∩∩∩

Lout4

SIL80C2

Rev. 04.25.11

SIL/SMT80C2

2 of 20

Embedded Power for

Business-Critical Continuity

Technical Reference Note

General Description

Figure1-ElectricalBlockDiagram

Figure 2 - Standard Application Drawing

5

12-14

9

15,16,18,

20,22,24

10

SIL80C2

Enable On/Off

GND

R

L

O

A

D

1

11

+Sense

-Sense

Ishare

6

4

Power Good

GND

3,7,8,17,

19,21,23