PT6510_08 Datasheet, PDF (7/11 Pages) Texas Instruments – 8-A Rated Output Current

Application Notes
PT6510 Series
Capacitor Recommendations for the PT6510 Series of
Integrated Switching Regulators
Input Capacitors:
The recommended input capacitance is determined by
330 µF minimum value (300 µF for Oscon or low-ESR
tantalum types), and 1 A minimum ripple current rating.
Ripple current and less than 100 mΩ equivalent series
resistance (ESR) are the major parameters, along with
temperature, when selecting an input capacitor. Tanta-
lum capacitors have a recommended minimum voltage
rating of twice 2× (max. DC voltage + AC ripple). This
is standard practice to insure reliability.
Output Capacitors:
The ESR of the required output capacitor must not be
greater than 150 mΩ. Electrolytic capacitors have poor
ripple performance at frequencies greater than 400 kHz
but excellent low-frequency transient response. Above
the ripple frequency, ceramic capacitors are necessary to
improve the transient response and reduce any high
frequency noise components apparent during higher
current excursions. Preferred low-ESR type capacitor
part numbers are identified in Table 2-1.
Tantalum Capacitors
Tantalum type capacitors may be used for the output but
only the AVX TPS, Sprague 593D/594/595, or Kemet
T495/T510 series. These capacitors are recommended
over many other tantalum types due to their higher rated
surge, power dissipation, and ripple current capability.
As a caution the TAJ series by AVX is not recommended.
This series has considerably higher ESR, reduced power
dissipation, and lower ripple current capability. The TAJ
series is less reliable than the AVX TPS series when
determining power dissipation capability. Tantalum or
Oscon types are recommended for applications where
ambient temperatures fall below 0 °C.
Capacitor Table
Table 2-1 identifies the characteristics of capacitors from
a number of vendors with acceptable ESR and ripple
current (rms) ratings. The number of capacitors required
at both the input and output buses is identified for each
capacitor type.
This is not an extensive capacitor list. Capacitors from other
vendors are available with comparable specifications. Those listed
are for guidance. The RMS ripple current rating and ESR
(at 100 kHz) are critical parameters necessary to insure both
optimum regulator performance and long capacitor life.
Table 2-1: Suggested Input/Output Capacitors
Capacitor
Vendor/
Component
Series
Working
Voltage
Panasonic
FC
United
Chemi-Con
LXV/FS/
LXZ
Nichicon
PL/ PM
Panasonic
FC
(Surface Mtg)
Oscon- SS
SV
25 V
35 V
35 V
16 V
35 V
10 V
20 V
35 V
35 V
50 V
10 V
35 V
16 V
10 V
10 V
20 V
Value (µF)
560 µF
390 µF
330 µF
330 µF
470 µF
330 µF
150 µF
560 µF
330 µF
470 µF
1000 µF
330 µF
330 µF
330 µF
330 µF
150 µF
Capacitor Characteristics
Max. ESR
at 100 kHz
0.0065 Ω
0.065 Ω
0.117 Ω
0.120 Ω
0.052 Ω
0.025 Ω
0.030 ÷2 Ω
0.048 Ω
0.065 ÷2 Ω
0.046 Ω
0.043 Ω
0.065 Ω
0.150 Ω
0.025 Ω
0.025 Ω
0.024 ÷2 Ω
Max. Ripple
Current at 85 °C
(Irms)
1205 mA
1205 mA
555 mA
555 mA
122 0mA
3500 mA
3200 mA
1360 mA
1020 mA
1470 mA
1205 mA
1205 mA
670 mA
>3500 mA
>3800 mA
3600 mA
Physical Size
(mm)
12.5x15
12.5x15
8x11.5
8x12
10x20
10x10.5
10x10.5
16x15
12.5x15
18x15
12x16.5
12.5x16
10x10.2
10.0x10.5
10.3x10.3
10.3x10.3
AVX
Tantalum
TPS
Kemet
T510/
T495
Sprague
594D
10 V
10 V
10 V
10 V
10 V
10 V
10 V
330 µF
330 µF
220 µF
330 µF
220 µF
330 µF
220 µF
0.100 ÷2 Ω
0.100 ÷2 Ω
0.095 Ω
0.033 Ω
0.07 Ω ÷2 =0.035 Ω
0.045 Ω
0.065 Ω
>2500 mA
>3000 mA
>2000 mA
1400 mA
>2000 mA
2350 mA
>2000 mA
7.3Lx
4.3Wx
4.1H
7.3Lx5.7W
x 4.0H
7.3Lx
6.0Wx
4.1H
N/R –Not recommended. The ripple current rating and ESR does not meet the requirements.
Quantity
Input Output
Bus Bus
Vendor Number
1
1 EEUFC1E561S
2
1 EEUFC1V391S
N/R
1 EEUFC1C331
N/R
1 LXZ16VB331M8X12LL
1
1 LXZ35VB471M10X20LL
1
1 10FS330M
2
2 20FS150M
1
1 UPL1V561MHH6
1
1 UPL1V331MHH6
1
1 UPM1H4711MHH6
1
1 EEVFC1A102LQ
1
1 EEVFC1V331LQ
N/R
1 EEVFC1C331P
1
1 10SS330M
1
1 10SV330M
2
2 20SV150M
SV= Surface Mount
2
1 TPSV337M010R0100
2
1 TPSV337M010R0060
2
2 TPSV227M0105R0100
2
1 T510X337M010AS
2
2 T495X227M010AS
2
1 4D337X0010R2T
2
2 594D227X0010D2T
For technical support or further information, visit http://power.ti.com