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参数资料
| 型号： | PT7744N |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC BOOSTER MODULE |
| 封装： | SIP-27 |
| 文件页数： | 4/9页 |
| 文件大小： | 181K |
| 代理商： | PT7744N |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT7710 Family, PT7744/PT7745
Capacitor Recommendations for
the PT7710
Series of Regulators and Current Boosters
Input Capacitors
The recommended input capacitance is determined by the
1.4 ampere minimum ripple current rating and 1500F
minimum capacitance. Capacitors listed below must be
rated for a minimum of twice (2
×) the input voltage with
+5V operation. Ripple current and
≤100m Equivalent
Series Resistance (ESR) values are the major consider-
ations 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 100m
. Failure to
observe this requirement may lead to regulator instability or
oscillation. Electrolytic capacitors have poor ripple perfor-
mance 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 microprocessor high
frequency noise components apparent during higher current
excursions. Preferred low ESR type capacitor part numbers
are identified in the Table 1-1 below.
Note: (N/R) is not recommended for this application, due to extremely low Equivalent Series Resistance (ESR)
Table 1-1 Capacitors Characteristic Data
Tantalum Characteristics
Tantalum capacitors with a minimum 10-V rating are
recommended on the output bus, but only the AVX TPS
Series, Sprague 594/595 Series, or Kemet T495/T510
Series. These AVX, Sprague, and Kemet capacitors are
specified over other types due to their higher surge cur-
rent, excellent power dissipation and ripple current ratings.
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.
Capacitor Table
Table 1-1 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. Capacitors from
other vendors are available with comparible specifications.
The RMS ripple current rating and ESR (Equivalent Series
Resistance at 100kHz) are the critical parameters necessary
to insure both optimum regulator performance and long
capacitor life.
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相关PDF资料 |
PDF描述 |
|---|---|
| PT7745N | 1-OUTPUT DC-DC BOOSTER MODULE |
| PT7746N | 1-OUTPUT DC-DC BOOSTER MODULE |
| PT7748C | SWITCHING REGULATOR, SMA27 |
| PT7748A | SWITCHING REGULATOR, SMA27 |
| PT7748N | SWITCHING REGULATOR, SMA27 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PT7745 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:20 Amp ＇Current Booster＇ for PT7711 ISR |
| PT7745A | 功能描述:REGULATR 20A BSTR FOR PT7711 HRZ RoHS:否 类别:电源 - 板载 >> DC DC Converters 系列:PT7740 标准包装:10 系列:PT4570 类型:隔离 输出数:1 电压 - 输入（最小）:36V 电压 - 输入（最大）:75V Voltage - Output 1:9V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:3.3A 电源（瓦） - 制造商系列:30W 电压 - 隔离:1.5kV（1500V） 特点:- 安装类型:表面贴装 封装/外壳:19-SIP SMD 模块 尺寸/尺寸:3.00" L x 1.19" W x 0.50" H（76.2mm x 30.2mm x 12.7mm） 包装:托盘 工作温度:-40°C ~ 85°C 效率:84% 电源（瓦特）- 最大:30W |
| PT7745C | 功能描述:REGULATR 20A BSTR FOR PT7711 SMD RoHS:否 类别:电源 - 板载 >> DC DC Converters 系列:PT7740 标准包装:10 系列:PT4570 类型:隔离 输出数:1 电压 - 输入（最小）:36V 电压 - 输入（最大）:75V Voltage - Output 1:9V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:3.3A 电源（瓦） - 制造商系列:30W 电压 - 隔离:1.5kV（1500V） 特点:- 安装类型:表面贴装 封装/外壳:19-SIP SMD 模块 尺寸/尺寸:3.00" L x 1.19" W x 0.50" H（76.2mm x 30.2mm x 12.7mm） 包装:托盘 工作温度:-40°C ~ 85°C 效率:84% 电源（瓦特）- 最大:30W |
| PT7745N | 功能描述:REGULATR 20A BSTR FOR PT7711 VRT RoHS:否 类别:电源 - 板载 >> DC DC Converters 系列:PT7740 标准包装:10 系列:PT4570 类型:隔离 输出数:1 电压 - 输入（最小）:36V 电压 - 输入（最大）:75V Voltage - Output 1:9V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:3.3A 电源（瓦） - 制造商系列:30W 电压 - 隔离:1.5kV（1500V） 特点:- 安装类型:表面贴装 封装/外壳:19-SIP SMD 模块 尺寸/尺寸:3.00" L x 1.19" W x 0.50" H（76.2mm x 30.2mm x 12.7mm） 包装:托盘 工作温度:-40°C ~ 85°C 效率:84% 电源（瓦特）- 最大:30W |
| PT7746 | 制造商:TI 制造商全称:Texas Instruments 功能描述:32 AMP “CURRENT BOOSTER” FOR PT7770 SERIES |
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