Datasheet

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PTMA401120ELECTRICALCHARACTERISTICS
PTMA403033
PTMA402050
PTMA401120
SLTS259B–FEBRUARY2006–REVISEDMAY2007
T
A
=25°C,V
I
=48V,V
O
=12V,C
I
=0µF,C
O
=0µF,andI
O
=I
O
max(Unlessotherwisestated)
PTMA401120
PARAMETERTESTCONDITIONSUNIT
MINTYPMAX
P
O
OutputpowerOverV
I
range12W
I
O
OutputcurrentOverV
I
range0.1
(1)
1
(2)
A
I
LIM
CurrentLimitThresholdShutdown,followedbyautorecovery1.5A
V
I
InputvoltagerangeOverI
O
range364875V
Set-pointvoltagetolerance±2
(3)
%V
O
Temperaturevariation-40°C≤T
A
≤85°C±1%V
O
LineregulationOverV
I
range10mV
V
O
LoadregulationOverI
O
range3mV
TotaloutputvoltagevariationIncludesset-point,line,load,–40°C≤T
A
≤85°C35
(3)
%V
O
TrimadjustrangeOverV
I
range10.813.2V
ηEfficiencyP
O
=P
O
max87%
V
O
Ripple(peak-to-peak)20-MHzbandwidth85mV
pp
0.1A/µsloadstep,Recoverytime400µs
TransientResponse50%to100%
V
O
over/undershoot±250mV
I
O
max
ReferencedtoV
I
–Inputhighvoltage(V
IH
)4.5Open
(4)
V
Outputenableinput(pin3)Inputlowvoltage(V
IL
)–0.20.8
Inputlowcurrent(I
IL
)1mA
StandbyinputcurrentPin3open8mA
UVLOUndervoltagelockout3234V
OVPOutputOvervoltageProtection13.517.5V
ƒ
S
SwitchingfrequencyOverV
I
range250300350kHz
Free-running180215
(5)
250
SyncswitchingfrequencykHz
Synchronizationrange250
(5)
350
(5)
SYNChigh-levelinputvoltage3.56V
low-levelinputvoltage–0.30.5V
clockdutycycle2575%
C
I
Externalinputcapacitance047µF
C
O
Externaloutputcapacitance047
(6)
220µF
V
ISO
Isolationvoltage1,500Vdc
C
ISO
IsolationcapacitancePrimary-Secondary1,100pF
R
ISO
Isolationresistance10MΩ
(1)Theconverterrequiresaminimumloadcurrentforproperoperation.Theconverterisnotdamagedwhenoperatedunderano-load
condition.
(2)Seetemperaturederatingcurvesforsafeoperatingarea(SOA),todetermineoutputcurrentderatingatelevatedambienttemperatures.
(3)Theset-pointvoltagetoleranceisaffectedbythetoleranceandstabilityofR
TRIM
.ThestatedlimitisunconditionallymetifR
TRIM
hasa
toleranceof1%,with100ppm/°Ctemperaturestability.
(4)TheEnableinput(pin 3)hasaninternalpullupresistor.Donotplaceanexternalpullupresistoronthisinputpin.Iftheenablefeatureis
notused,forapositiveenabledevicethisinputshouldbeleftopencircuitandanegativeenabledeviceshouldbepermanently
connectedtoV
I
–(pin2).AdiscreteMOSFETorbipolartransistorisrecommendedfortheenablecontrol.Theopen-circuitvoltageis
typicallylessthan5V.SeetheApplicationInformationforamoredetaileddescription.
(5)Adevicewiththesynchronizationoptionhasareducedswitchingfrequencyof215kHztypical.Thesynchronizationfrequencycanonly
beadjustedtoahigherfrequency,upto350kHzmaximum.
(6)Anoutputcapacitorisnotrequiredforproperoperation.However,additionalcapacitanceattheloadwillimprovethetransientresponse.
5
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