LM317A - LM117/LM317A/LM317 3 端子可调稳压器

LM317A是TI德州仪器公司的一款单通道LDO产品，LM317A是LM117/LM317A/LM317 3 端子可调稳压器，本站介绍了LM317A的封装应用图解、特点和优点、功能等，并给出了与LM317A相关的TI元器件型号供参考。

LM317A - LM117/LM317A/LM317 3 端子可调稳压器 - 单通道LDO - 线性稳压器(LDO) - 德州仪器

产品特性

Typical 0.005%/V Line Regulation
1% Output Voltage Tolerance
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
−40°C to 125°C Operating Temperature Range

产品应用

Automotive LED Lighting
Battery Chargers
Post Regulation for Switching Supplies
Constant-Current Regulator
Microprocessor Supplies

Typical Application

*Needed if device is more than 6 inches from filter capacitors.
†Optional—improves transient response
††

产品说明

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. The LM317A device is available in an SOT-223 package, which makes it ideal for space-constrained applications that require high-performance regulation. The device is exceptionally easy to use and requires only two external resistors to set the output voltage. 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 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 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. 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 data sheets for LM150 series (3A), SNVS772, and LM138 series (5A), SNVS771. For the negative complement, see LM137 (SNVS778) series data sheet.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
LM317A	TO-220 (3)	14.986 mm × 10.16 mm
	SOT-223 (4)	6.50 mm × 3.50 mm
	TO (3)	8.255 mm × 8.255 mm
	TO-252 (3)	6.58 mm × 6.10 mm

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