PA13 • PA13A

6

PA13U

P r o d u c t I n n o v a t i o n F r o m

1. Capacitiveanddynamic*inductiveloadsuptothefollowingmaximumaresafewiththecurrentlimitssetas

specified.

CAPACITIVE LOAD

INDUCTIVE LOAD

±V

I

I

I

I

50V

200µF

125µF

5mH

2.0mH

40V

500µF

350µF

15mH

3.0mH

35V

2.0mF

850µF

50mH

5.0mH

30V

7.0mF

2.5mF

150mH

10mH

25V

25mF

10mF

500mH

20mH

20V

60mF

20mF

1,000mH

30mH

15V

150mF

60mF

2,500mH

50mH

*Iftheinductiveloadisdrivennearsteadystateconditions,allowingtheoutputvoltagetodropmorethan12.5Vbe-

lowthesupplyrailwithILIM=10Aor27VbelowthesupplyrailwithILIM=5Awhiletheamplifieriscurrentlimiting,

theinductormustbecapacitivelycoupledorthecurrentlimitmustbeloweredtomeetSOAcriteria.

2. TheamplifiercanhandleanyEMFgeneratingorreactiveloadandshortcircuitstothesupplyrailorcommonif

thecurrentlimitsaresetasfollowsatTC=25°C:

SHORT TO ±V

S

SHORT TO

±V

S

C, L, OR EMF LOAD

COMMON

45V

.43A

3.0A

40V

.65A

3.4A

35V

1.0A

3.9A

30V

1.7A

4.5A

25V

2.7A

5.4A

20V

3.4A

6.7A

15V

4.5A

9.0A

Thesesimplifiedlimitsmaybeexceededwithfurtheranalysisusingtheoperatingconditionsforaspecificapplica-

tion.

CURRENT LIMITING

RefertoApplicationNote9,"CurrentLimiting",fordetailsofbothfixedandfoldovercurrentlimitoperation.Visitthe

ApexPrecisionPowerwebsiteatwww.cirrus.comforacopyofPower_design.exewhichplotscurrentlimitsvs.

steadystateSOA.Bewarethatcurrentlimitshouldbethoughtofasa±20%functioninitiallyandvariesabout2:1

overtherangeof–55°Cto125°C.

Forfixedcurrentlimit,leavepin4openanduseequations1and2.

R

0.65

I

CL

(1)

I

0.65

R

CL

(2)

Where:

I

R