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參數(shù)資料
| 型號： | PT6985N |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | 隔離反激式開關(guān)穩(wěn)壓9V輸出 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 293K |
| 代理商： | PT6985N |
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 minimin operating limits.
Capacitor Recommendations for
the
Dual-Output PT6980 Regulator Series
Input Capacitors:
The recommended input capacitance is determined by 1.0
ampere minimum ripple current rating and 330μF minimum
capacitance . Ripple current and <100m
equivalent se-
ries resistance (ESR) values are the major considerations,
along with temperature, 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 applications
Output Capacitors: C
2
(Required), C
3
(Optional)
The ESR of the required capacitor (C
2
) must not be greater
than 50m
. 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 100μF capacitor (C
3
) for V
2
out can
have an ESR of up to 200m
for optimum performance
and ripple reduction.
(Note: Vendor part numbers for the
optional capacitor, C
3
, are not identified in the table. Use the
same series selected for C
2
)
PT6980 Series
Tantalum Capacitors
Tantalum type capacitors may be used at the output, but
only the AVX TPS series, Sprague 593D/594/595 series,
or Kemet T495/T510 series. The AVX TPS series, Kemet
or Sprague series tantalums are recommended over many
other 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 also 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 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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