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| 型號(hào)： | PT6937A |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 10 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA23 |
| 封裝： | HORIZONTAL MOUNT PACKAGE-23 |
| 文件頁(yè)數(shù)： | 13/14頁(yè) |
| 文件大?。?/td> | 267K |
| 代理商： | PT6937A |
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For technical support and more information, see inside back cover or visit www.ti.com
Table 1: Input/Output Capacitors
N/R –Not recommended. The voltage rating does not meet the minimum operating limits.
Capacitor Recommendations for
the
Dual-Output PT6935 Regulator Series
Input Capacitors:
The recommended input capacitance is determined by 1.0
ampere minimum ripple current rating and 330F minimum
capacitance (300F for Oscon or low ESR tantalum).
Ripple current and <100m
equivalent series resistance
(ESR) values are the major considerations, along with tem-
perature, when designing with different types of capacitors.
Tantalum capacitors have a recommended minimum voltage
rating of 2
× the maximum DC voltage + AC ripple. This is
necessary to insure reliability for input voltage bus applica-
tions
Output Capacitors: C2(Required), C3(Optional)
The ESR of the required capacitor (C2) must not be greater
than 150m
. Electrolytic capacitors have poor ripple per-
formance at frequencies greater than 400kHz but excellent
low frequency transient response. Above the ripple fre-
quency, 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 1. The optional 100F capacitor (C3) for V2out can
have an ESR of up to 200m
for optimum performance
and ripple reduction. (Note: Vendor part numbers for the
optional capacitor, C3, are not identified in the table. Use the
same series selected for C2)
PT6935 Series
Tantalum Capacitors
Tantalum type capacitors can be used for the output but only
the AVX TPS series, Sprague 593D/594/595 series 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 dissipa-
tion, 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 tem-
peratures fall below 0°C.
Capacitor Table
Table 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
(Equivalent Series Resistance at 100kHz) are critical parameters
necessary to insure both optimum regulator performance and
long capacitor life.
Application Notes
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