LM317A

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1.5A、40V、高精度、可调节线性稳压器

产品详情

Output options Adjustable Output, Fixed Output Iout (max) (A) 1.5 Vin (max) (V) 40 Vin (min) (V) 3 Vout (max) (V) 37 Vout (min) (V) 1.2 Fixed output options (V) 37 Rating Catalog, Military Noise (µVrms) 38 PSRR at 100 KHz (dB) 40 Iq (typ) (mA) 5 Thermal resistance θJA (°C/W) 24 Load capacitance (min) (µF) 0 Regulated outputs (#) 1 Accuracy (%) 5 Dropout voltage (Vdo) (typ) (mV) 2250 Operating temperature range (°C) -40 to 125
Output options Adjustable Output, Fixed Output Iout (max) (A) 1.5 Vin (max) (V) 40 Vin (min) (V) 3 Vout (max) (V) 37 Vout (min) (V) 1.2 Fixed output options (V) 37 Rating Catalog, Military Noise (µVrms) 38 PSRR at 100 KHz (dB) 40 Iq (typ) (mA) 5 Thermal resistance θJA (°C/W) 24 Load capacitance (min) (µF) 0 Regulated outputs (#) 1 Accuracy (%) 5 Dropout voltage (Vdo) (typ) (mV) 2250 Operating temperature range (°C) -40 to 125
SOT-223 (DCY) 4 45.5 mm² 6.5 x 7 TO-220 (NDE) 3 46.5328 mm² 10.16 x 4.58 TO-252 (NDP) 3 65.2078 mm² 6.58 x 9.91 TO-CAN (NDT) 3 91.6742 mm² 10.03 x 9.14
  • For a newer drop-in alternative, see the LM317
  • Typical 0.005%/V line regulation
  • 1% output voltage tolerance
  • 1.5-A output current
  • Adjustable output down to 1.25 V
  • Input-output differential up to 40 V
  • Current limit constant with temperature
  • No output capacitor required
  • Short-circuit protected output
  • −40°C to 125°C operating temperature range
  • For a newer drop-in alternative, see the LM317
  • Typical 0.005%/V line regulation
  • 1% output voltage tolerance
  • 1.5-A output current
  • Adjustable output down to 1.25 V
  • Input-output differential up to 40 V
  • Current limit constant with temperature
  • No output capacitor required
  • Short-circuit protected output
  • −40°C to 125°C operating temperature range

The LM317A adjustable 3-terminal, positive-voltage regulators are capable of supplying current in excess of 1.5 A over a 1.25-V to 37-V output range and provide 1% output-voltage accuracy. Both line regulation and load regulation are better achieved with the LM317A device than with standard fixed regulators.

The LM317A offers full overload protection such as over current, thermal-overload protection, and safe-area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected.

Typically, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors, in which case an input bypass is needed. An optional output capacitor can be added to improve transient response and can be replaced with a ceramic and appropriate ESR. The adjustment terminal can be bypassed to achieve very high ripple-rejection ratios that are difficult to achieve with standard 3-terminal regulators.

Because the LM317A regulator is floating and detects only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input-to-output differential is not exceeded. Exceeding the maximum input-to-output deferential will result in short-circuiting the output. By connecting a fixed resistor between the adjustment pin and output, the LM317A can be also used as a precision current regulator.

For applications requiring greater output current, see the LM150 series (3A) and LM138 series (5A) data sheets. For the negative complement, see the LM137 series data sheet.

The LM317A adjustable 3-terminal, positive-voltage regulators are capable of supplying current in excess of 1.5 A over a 1.25-V to 37-V output range and provide 1% output-voltage accuracy. Both line regulation and load regulation are better achieved with the LM317A device than with standard fixed regulators.

The LM317A offers full overload protection such as over current, thermal-overload protection, and safe-area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected.

Typically, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors, in which case an input bypass is needed. An optional output capacitor can be added to improve transient response and can be replaced with a ceramic and appropriate ESR. The adjustment terminal can be bypassed to achieve very high ripple-rejection ratios that are difficult to achieve with standard 3-terminal regulators.

Because the LM317A regulator is floating and detects only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input-to-output differential is not exceeded. Exceeding the maximum input-to-output deferential will result in short-circuiting the output. By connecting a fixed resistor between the adjustment pin and output, the LM317A can be also used as a precision current regulator.

For applications requiring greater output current, see the LM150 series (3A) and LM138 series (5A) data sheets. For the negative complement, see the LM137 series data sheet.

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技术文档

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类型 标题 下载最新的英语版本 日期
* 数据表 LM317A 1% Accurate 1.5A Adjustable Voltage Regulator 数据表 (Rev. A) PDF | HTML 2020年 6月 9日
应用手册 A Topical Index of TI LDO Application Notes (Rev. F) 2019年 6月 27日
EVM 用户指南 LM317A-337N-EVM User's Guide 2016年 1月 21日
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应用手册 AN-1028 Maximum Power Enhancement Techniques for Power Packages (Rev. B) 2013年 5月 6日
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应用手册 AN-1148 Linear Regulators: Theory of Operation and Compensation (Rev. B) 2013年 5月 6日
应用手册 AN-182 Improving Power Supply Reliability with IC Power Regulators (Rev. B) 2013年 5月 5日
应用手册 Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) 2013年 5月 5日
更多文献资料 Die D/S LM317A MWC 3-Terminal Adj Regulator 2012年 9月 20日
应用手册 Packaging Limits Range of Linear Regulators 2010年 5月 8日
应用手册 Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A) 2008年 6月 4日
应用手册 Adjustable 3-Terminal Regulator for Low-Cost Battery Charging Systems 2002年 10月 3日
应用手册 Understanding the Terms and Definitions of LDO Voltage Regulators 1999年 10月 21日

设计和开发

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评估板

LM317A-337N-EVM — 3 引脚可调节稳压器评估模块

LM317A-337N-EVM 演示了 LM317A 可调稳压器及其负向互补稳压器 LM337-N 的典型应用。此评估模块为每个器件采用 SOT-223 封装选项,提供高达 1.0A 的负载电流。此 EVM 可轻松修改以填充 TO-220 版器件,从而适应 1.5A 工作电流。此模块提供了足量的占用空间供客户选择电容,还具有 4 个铜层和散热空间以实现出色的功耗。

用户指南: PDF
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仿真模型

LM317A PSpice Transient Model (Rev. A)

SNVMAP0A.ZIP (54 KB) - PSpice Model
仿真模型

LM317A Unencrypted PSpice Transient Model (Rev. A)

SNVMAP1A.ZIP (2 KB) - PSpice Model
封装 引脚 CAD 符号、封装和 3D 模型
SOT-223 (DCY) 4 Ultra Librarian
TO-220 (NDE) 3 Ultra Librarian
TO-252 (NDP) 3 Ultra Librarian
TO-CAN (NDT) 3 Ultra Librarian

订购和质量

包含信息:
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 鉴定摘要
  • 持续可靠性监测
包含信息:
  • 制造厂地点
  • 封装厂地点

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