PT6715_14 Datasheet, PDF (7/9 Pages) Texas Instruments – 13-A Output Current

Application Notes
PT6701/PT6702/PT6703,
PT6705 & PT6715 Series
Capacitor Recommendations for the Non-Isolated
13-A Excalibur™ Series of Regulators
Input Capacitors
The recommended input capacitor(s) is determined by
the 2 ampere (rms) minimum ripple current rating and
1,000µF minimum capacitance. Ripple current and
≤100mΩ ESR (Equivalent Series Resistance) values are
the major considerations, along with temperature, when
selecting the proper capacitor. Tantalum capacitors have a
recommended minimum voltage rating of 2× the input
voltage; 10V for +5V operation.
Output Capacitors
The minimum required output capacitance is 330µF
with a maximum ESR ≤100mΩ. Failure to observe this
requirement may lead to regulator instability or oscilla-
tion. Electrolytic capacitors have poor ripple performance
at frequencies greater than 400kHz, but excellent low
frequency transient response. Above the ripple frequency
ceramic decoupling capacitors are necessary to improve
the transient response and reduce any high frequency
noise components apparent during higher current excur-
sions. Preferred low ESR type capacitor part numbers
are identified in Table 3-1 below.
Table 3-1 Capacitors Characteristic Data
Tantalum Characteristics
Tantalum capacitors with a minimum 10V rating are
recommended for the input bus, but only the AVX TPS,
Sprague 594/595, or Kemet T495/T510 series. These
types are recommended over many others due to their
higher surge current, power dissipation and ripple cur-
rent capability. As a caution, the TAJ series by AVX is
not recommended. This series exhibits considerably
higher ESR, reduced power dissipation and lower ripple
current capability. The TAJ Series is also less reliable
compared to the TPS series when determining power
dissipation capability. Tantalum capacitors are highly
recommended in applications where ambient tempera-
tures fall below 0°C.
Capacitor Table
Table 3-1 identifies the characteristics of capacitors from
a number of vendors with acceptable ESR and ripple cur-
rent (rms) ratings. The suggested minimum quantities per
regulator for both the input and output buses are iden-
tified.
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 (Equivalent Series Resistance at 100kHz) are the critical
parameters to insure both optimum regulator performance
and long capacitor life.
Capacitor Vendor
Series
Capacitor Characteristics
Quantity
Working
Voltage
Panasonic
25V
FC/FK (Surface Mount)
35V
FC (Radial)
25V
25V
United Chemi-Con
25V
LXV (Radial)
35V
16V
FX (Surface Mount)
10V
Nichicon
25V
PL Series
25V
PM Series
25V
Os-con:
SS
10V
SVP (Surface Mount)
10V
AVX Tanatalum
TPS Series
10V
(Surface Mount)
10V
Vishay/Sprague Tantalum 10V
595D/594D Series
(Surface Mount)
10V
Kemet Tantalum
10V
T510/T495 Series
(Surface Mount)
10V
Sanyo Poscap
10V
TPB (surface Mount)
Value(µF) (ESR) Equivalent
Series Resistance
1000
330
330
1200
330
1200
2700
680
330
2200
330
0.038Ω
0.080Ω
0.090Ω
0.038Ω
0.084Ω
0.028Ω
0.028Ω
0.015Ω÷2 =0.007Ω
0.095Ω
0.028Ω
0.095Ω
330 0.025Ω÷3 =0.008Ω
330 0.025Ω÷3 =0.008Ω
330 0.100Ω÷3 =0.034Ω
330 0.060Ω÷3 =0.020Ω
330 0.045Ω÷3 =0.015Ω
680 0.090Ω÷4 =0.023Ω
330 0.035Ω÷3 =0.012Ω
220 0.070Ω÷5 =0.035Ω
220 0.040Ω÷5 =0.008Ω
85°C Maximum
Ripple
Current(Irms)
2000mA
850mA
755mA
2000mA
825mA
2070mA
2070mA
>7000mA
750mA
2050mA
750mA
>7000mA
>7000mA
>3500mA
>3500mA
>4600mA
>2500mA
>5000mA
>3000mA
>3000mA
Physical
Size(mm)
18×16.5
10×10.2
10×12.5
18×15
10×16
16×25
16×25
10×10.5
10×15
18×20
10×15
10×10.5
10.3×11
7.0 L
×5.97 W
×3.45 H
7.2 L
×6.0 W
×3.5 H
7.3 L
×4.3 W
×4.0 H
7.2 L
×4.3 W
×3.1 H
Input
Bus
Output
Bus
Vendor Number
1
1 EEVFC1E102N
1 EEVFK1V331P
1 EEUFC1E331
1
1 EEUFC1E122S
1 LXV25VB331M10X16LL
1
1 LXV35VB122M16X25LL
1
1 LXV16VB272M16X25LL
2
1 10FX680M (Os-con)
1 UPL1E331MPH6
1
1 UPL1E222MHH6
1 UPM1E331MPH6
3
1 10SS330M
3
1 10SVP330
3
1 TPSV337M010R0100
3
1 TPSV337M010R0060
3
1 594D337X0010R2T
2
1 595D687X0010R2T
3
1 T510X337M010AS
5
2 T495X227M010AS
5
2 10TPB220M
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