LM317-N
- For a newer drop-in alternative, see the LM317
- Typ. 0.1% load regulation
- Typ. 0.01%/V line regulation
- 1.5-A output current
- Adjustable output down to 1.25 V
- Current limit constant with temperature
- 80-dB ripple rejection
- Short-circuit protected output
- −55°C to 150°C operating temperature range (LM117)
The LM117 and LM317-N series of adjustable 3-pin positive voltage regulators are capable of supplying in excess of 1.5 A over a 1.25-V to 37-V output range and a wide temperature range. They are exceptionally easy to use and require only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators.
The LM117 and LM317-N offer full overload protection such as current limit, 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. 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 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. That is, avoid short-circuiting the output.
By connecting a fixed resistor between the adjustment pin and output, the LM117 and LM317-N can be also used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground, which programs the output to 1.25 V where most loads draw little current.
For applications requiring greater output current, see the LM150 series (3 A) and LM138 series (5 A) data sheets. For the negative complement, see the LM137 series data sheet.
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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。
MLTLDO2EVM-037 — 用于 DCY、DDA 和 KVU 封装的通用 LDO 线性稳压器评估模块
借助采用多种封装选项的 MLTLDO2EVM-037 低压降 (LDO) 评估模块 (EVM),设计工程师能评估可能用于其自身电路应用的线性稳压器采用多种常见封装时的运行情况和性能。这种 EVM 配置包含一个 DDA、3 引脚和 5 引脚 KVU 以及 DCY 封装,便于工程师焊接和评估部件。
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-220 (NDG) | 3 | Ultra Librarian |
TO-252 (NDP) | 3 | Ultra Librarian |
TO-263 (KTT) | 3 | Ultra Librarian |
TO-CAN (NDT) | 3 | Ultra Librarian |
订购和质量
- 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
- 制造厂地点
- 封装厂地点
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