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DESIGNING FOR VERY FAST LOAD TRANSIENTS

PTH12010W, PTH12010L

SLTS205E–JUNE 2003–REVISED APRIL 2006

APPLICATION INFORMATION (continued)

The transient response of the DC/DC converter has been characterized using a load transient with a di/dt of

1 A/µs. The typical voltage deviation for this load transient is given in the data sheet specification table using the

optional value of output capacitance. As the di/dt of a transient is increased, the response of a converter’s

regulation circuit ultimately depends on its output capacitor decoupling network. This is an inherent limitation

with any dc/dc converter once the speed of the transient exceeds its bandwidth capability. If the target

application specifies a higher di/dt or lower voltage deviation, the requirement can only be met with additional

output capacitor decoupling. In these cases special attention must be paid to the type, value and ESR of the

capacitors selected.

If the transient performance requirements exceed that specified in the data sheet, or the total amount of load

capacitance is above 3000 µF, the selection of output capacitors becomes more important.

CAPACITOR CHARACTERISTICS

QUANTITY

CAPACITOR VENDOR,

WORKING VALUE

MAX. ESR

MAX RIPPLE

PHYSICAL

INPUT

OPTIONAL VENDOR PART

TYPE/SERIES, (STYLE)

VOLTAGE

(µF)

AT 100 kHz

CURRENT AT

SIZE (mm)

BUS

OUTPUT

NUMBER

85°C (lrms)

BUS

Panasonic, Aluminum

25 V

560

0.065 Ω

1205 mA

12,5 x 15

1

1

EEUFC1E561S

(FC)

FC, Radial

25 V

1000

0.060 Ω

1100 mA

12,5 x 13,5

1

1

EEVFK1E102Q

FK, (SMD)

35 V

680

0.060 Ω

1100 mA

12,5 x 13,5

1

1

EEVFK1V681Q

United Chemi-Con

PS, Poly-Aluminum

16 V

330

0.014 Ω

5050 mA

10 x 12,5

2

≤2

16PS330MJ12

(Radial)

LXZ, Aluminium (Radial)

16 V

680

0.068 Ω

1050 mA

10 x 16

1

1

LXZ16VB681M10X16LL

PXA, Poly-Aluminum

16 V

330

0.014 Ω

5050 mA

10 x 12,2

2

≤2

PXA16VC331MJ12TP

(SMD)

Nichicon, Aluminum

25 V

560

0.060 Ω

1060 mA

12,5 x 15

1

1

UPM1E561MHH6

(PM)

HD, (Radial)

16 V

680

0.038 Ω

1430 mA

10 x 16

1

1

UHD1C681MPR

PM, (Radial)

35 V

560

0.048 Ω

1360 mA

16 x 15

1

1

UPM1V561MHH6

Panasonic,

Poly-Aluminum

S/SE,

6.3 V

180

0.005 Ω

4000 mA

7,3 x 4,3 x 4,2

EEFSEOJ181R

(SMD)Poly-Aluminum

Sanyo

TPE Poscap (SMD)

10 V

330

0.025 Ω

3000 mA

7,3 x 5,7

≤4

10TPE330M

SEQP, Os-Con (Radial)

16 V

330

0.016 Ω

>4720 mA

10 x 13

2

≤2

16SEQP330M

SVP, Os-Con (SMD)

16 V

330

0.016 Ω

4700 mA

11 x 12

2

≤3

16SVP330M

AVX, Tantalum Series III

TPS (SMD)

10 V

470

0.045 Ω

>1723 mA

TPSE477M010R0045

7,3 x 5,7 x 4,1

10 V

330

0.045 Ω

>1723 mA

TPSE377M010R0045

Kemet

(29) Capacitor Supplier Verification

Please verify availability of capacitors identified in this table. Capacitor suppliers may recommend alternative part numbers because of

limited availability or obsolete products. In some instances, the capacitor product life cycle may be in decline and have short-term

consideration for obsolescence.

RoHS, Lead-free and Material Details

Please consult capacitor suppliers regarding material composition, RoHS status, lead-free status, and manufacturing process

requirements. Component designators or part number deviations can occur when material composition or soldering requirements are

updated.

(30) N/R –Not recommended. The capacitor voltage rating does not meet the minimum derated operating limits.

(31) The voltage rating of this capacitor only allows it to be used for output voltages that are equal to or less than 5.1 V.

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