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LM317T

1.5A adjustable positive voltage regulator, 1.25-37V, TO-220-3

15200

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Pieza del fabricante：

LM317T

Paquete：

TO-220-3 / KCS (10.16 x 4.55 x 9.28 mm, tab=VOUT)

Marca：
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Descripción

Productos

The LM317T from Texas Instruments is an adjustable 3-terminal positive voltage regulator capable of supplying over 1.5A over an output voltage range of 1.25V to 37V. Only two external resistors set the output voltage. Features internal current limiting, thermal shutdown, and safe operating area protection in a TO-220-3 package.

Especificaciones

Output Voltage Range 1.25V to 37V
Corriente de salida 1.5A
Line Regulation 0.01%/V typical
Load Regulation 0.1% typical
Reference Voltage 1.25V nominal
Ripple Rejection 80dB @ 120Hz
Temperatura de funcionamiento 0 to 125°C
Paquete TO-220-3

Características

  • 1.25V to 37V adjustable output with two resistors
  • 1.5A output current
  • 0.01%/V line regulation, 0.1% load regulation
  • Internal thermal overload protection
  • Internal short-circuit current limiting
  • Output safe-area compensation
  • Floating operation for high-voltage applications

Aplicaciones

  • Adjustable bench power supplies
  • On-card voltage regulation
  • Battery charger circuits
  • Current regulator applications
  • Programmable output regulators

The LM317T from TI is an industry-standard adjustable 3-terminal positive voltage regulator. It supplies over 1.5A with proper heatsinking and output voltage is set by two external resistors: VOUT = 1.25V x (1 + R2/R1). Outstanding 0.01%/V line regulation and 0.1% load regulation. Comprehensive protection: current limiting, thermal shutdown, safe-area compensation.

Maintains 1.25V reference between OUTPUT and ADJUST pins. With R1 (OUT-ADJ) and R2 (ADJ-GND), VOUT = 1.25V x (1 + R2/R1) + IADJ x R2. Internal error amplifier adjusts NPN Darlington output to maintain regulation. Thermal shutdown at ~170°C. Current limit reduces output when input-output differential exceeds safe operating area.

Pin Nombre Tipo Función
1 ADJUST Entrada Voltage adjustment feedback
2 VOUT Salida Regulated output (heatsink tab)
3 VIN Potencia Unregulated input supply
  • Adjustable bench power supplies (1.25-37V)
  • Local on-card voltage regulation
  • Battery charger circuits (constant V or I)
  • Current regulator (IOUT = 1.25V/R)
  • Programmable supply with DAC-controlled R2
Fabricante Número de pieza Paquete Notas
TI LM317AT TO-220-3 Tighter 1% tolerance
onsemi LM317TG TO-220-3 onsemi version, pin compatible
TI LM337T TO-220-3 Negative adjustable complement
TI LM317DCY SOT-223 SMD version
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Tel / WhatsApp: +86 13760382860

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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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