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参数资料
| 型号： | PT6721C |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 14 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA23 |
| 封装： | SURFACE MOUNT PACKAGE-23 |
| 文件页数： | 5/7页 |
| 文件大小： | 194K |
| 代理商： | PT6721C |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT6721/6725 Series
Capacitor Recommendations for the
PT6721 and PT6725 Series Regulators
Input Capacitors
The recommended input capacitance is determined by
1.6 ampere minimum ripple current rating and 1000F
minimum capacitance. Tantalum capacitors listed below
cannot be used on the input bus since they are not rated
for 12V operation. Ripple current and Equivalent Series
Resistance (ESR) values are the major considerations along
with temperature when selecting the proper capacitor.
Output Capacitors
The minimum required output capacitance is 330F with
a maximum ESR less than or equal to 50mW. Failure to
observe this requirement may lead to regulator instability
or oscillation. 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 micropro-
cessor high frequency noise components apparent during
higher current excursions. Preferred low ESR type
capacitor part numbers are identified in the Table 1 below.
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Note: (N/R) 10V tantalums are not recommend for the input bus.
Table 1 Capacitors Characteristic Data
Tantalum Characteristics
Tantalum capacitors are recommended on the output bus
but only TPS Series, Sprague 593D/594/595 Series, or
Kemet T495/T510 Series. The AVX TPS Series, Sprague
Series or Kemet Series tantalum capacitors are recom-
mended over other manufacturer’s due to their higher
surge current, excellent power dissipation and ripple current
ratings. As an example, 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 a less reliable compared to
the TPS series when comparing power dissipation
capability.
Capacitor Table
Table 1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple current
(rms) ratings. The suggested minimum quantities per
regulator for both the input and output buses are identified.
This is not an extensive capacitor list. The table below is a
selection guide for input and output capacitors. Other capacitor
vendors are available with comparable RMS ripple current rating
and ESR (Equivalent Series Resistance at 100kHz). These critical
parameters are necessary to insure both optimum regulator perfor-
mance and long capacitor life.
相关PDF资料 |
PDF描述 |
|---|---|
| PT6722A | 14 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA23 |
| PT6722N | 14 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA27 |
| PT6722C | 14 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA27 |
| PT6727N | 13 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA17 |
| PT6724C | 14 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA17 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PT67-21C | 制造商:EVERLIGHT 制造商全称:Everlight Electronics Co., Ltd 功能描述:Top Phototransistor |
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| PT67-21C/L41/TR8 | 功能描述:光电晶体管 IR Phototransistor RoHS:否 制造商:OSRAM Opto Semiconductors 最大功率耗散:165 mW 最大暗电流:200 nA 封装 / 箱体:T-1 |
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| PT67-21C2 | 制造商:EVERLIGHT 制造商全称:Everlight Electronics Co., Ltd 功能描述:high speed silicon NPN epitaxial planar phototransistor in a compact surface-mountable package. |
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