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SP7661 Datasheet(PDF) 8 Page - Sipex Corporation

Part # SP7661
Description  Wide Input Voltage Range 3A, 600kHz, Buck Regulator
PDF  20 Pages
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP7661 Datasheet(HTML) 8 Page - Sipex Corporation

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Nov3-06 Rev I
SP766 Wide Input Voltage Range 3A, 600kHz Buck Regulator
© 2006 Sipex Corporation
SolvingforRS3weget:
RS3 =[60mV•(RS1+RS2)]
[(IMAx •DCR)–60mV]
Asanexample:ifdesiredIMAxis17A,then
RS3=63.4KΩ.
RS3
63.4KΩ
CSP
6.8nF
SWN
ISP
ISN
SP7661
CS
0.1uF
RS2
5.11KΩ
RS
5.11KΩ
L=2.7uH,DCR=4.1mΩ
VOUT
Over-current detection circuit for
Imax > 60mV / DCR
Decreasing the Current Limit
IfitisrequiredtosetIMAx<{60mV/DCR,
aresistorisaddedasshowninthefollow-
ing figure. RS3 increases the net voltage
detectedbythecurrent-sensecomparator.
Voltageatthepositiveandnegativeterminal
ofcomparatorisgivenby:
VSP = VOut+(IMAx •DCR)
VSN = VOut •
{RS3/(RS2+RS3)}
Sincethecomparatoristriggeredat60mV:
VSP-VSN=60mV
Combiningtheaboveequationsandsolv-
ingforRS3:
RS3 =
RS2 •
[VOut-60mV+(IMAX• DCR)]
60mV-(IMAX •DCR)
Asanexample:forIMAxof4AandVOutof3.3V,
calculated RS3is381kΩ.
CSP
6.8nF
ISN
SP7661
SWN
ISP
CS
0.1uF
RS2
5.11KΩ
RS
5.11KΩ
VOUT
L=2.7uH,DCR=4.1mΩ
RS3
1.5MΩ
Over-current detection circuit for
Imax < {60mV / DCR}
Handling of Faults
Uponthedetectionofpower(UVLO),ther-
mal,orshort-circuitfaults,theSP7661is
forcedintoanidlestatewheretheSSand
COMPpinsarepulledlowandbothswitches
areheldoff.IntheeventofUVLOfault,the
SP7661remainsinthisidlestateuntilthe
UVLOfaultisremoved.Uponthedetection
ofathermalorshort-circuitfault,aninternal
100mstimerisactivated.Intheeventofa
short-circuitfault,arestartisattemptedim-
mediatelyafterthe100mstimeoutexpires.
Whereas,whenathermalfaultisdetected
the100msdelaycontinuouslyrecyclesanda
restartcannotbeattempteduntilthethermal
faultisremovedandthetimerexpires.
THEORY OF OPERATION



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