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TL431ACLP

Precision shunt regulator, 2.495V-36V adjustable, 1% accuracy, TO-92

7680

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Pieza del fabricante：

TL431ACLP

Paquete：

TO-92 (4.83×3.43×3.68 mm, through-hole)

Marca：
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Descripción

Productos

The TL431ACLP from Texas Instruments is a three-terminal adjustable precision shunt regulator. It provides a programmable output voltage between Vref (~2.495V) and 36V using two external resistors, with 1% initial accuracy (A grade). Packaged in a through-hole TO-92, it is widely used as a voltage reference, error amplifier in SMPS feedback loops, and as a precision Zener diode replacement.

Especificaciones

Reference Voltage 2.495V (typical), ±1% (A grade)
Adjustable Output Range Vref to 36V
Cathode Current Range 1 mA to 100 mA
Dynamic Output Impedance 0.2Ω (typical)
Temperature Drift 6 mV typical over temperature (C grade)
Reference Input Current 1.5 µA (typical)
Off-State Cathode Current 0.05 µA (typical)
Max Cathode Voltage 37V
Temperatura de funcionamiento 0°C to +70°C (C grade)
Paquete TO-92 (LP, 3-pin)

Características

  • Precision 2.495V bandgap reference with 1% accuracy (A grade)
  • Adjustable output from 2.5V to 36V via external resistor divider
  • Low dynamic output impedance: 0.2Ω typical
  • Sharp turn-on characteristic for Zener diode replacement
  • Sink current capability: 1 mA to 100 mA
  • Three accuracy grades: 0.5% (B), 1% (A), 2% (standard)
  • Industry-standard TO-92 3-pin package

Aplicaciones

  • SMPS feedback loop error amplifier with optocoupler
  • Adjustable voltage reference and Zener replacement
  • On-board voltage regulation and power supply control
  • Battery charger voltage monitoring
  • Current limit and constant-current sink circuits

The TL431ACLP from Texas Instruments is a three-terminal adjustable precision shunt regulator with 1% initial reference accuracy (A grade). Its programmable output range from 2.495V to 36V and low 0.2Ω dynamic output impedance make it an ideal replacement for Zener diodes in precision applications. Widely used as an error amplifier in SMPS feedback loops with optocouplers, it is one of the most popular voltage reference ICs in power supply design.

The TL431ACLP operates as a precision shunt regulator by comparing the voltage at the REF pin with an internal 2.495V bandgap reference. When the REF pin voltage exceeds the internal reference, the cathode-to-anode conduction increases, shunting more current to regulate the voltage. The output voltage is set by two external resistors: VOUT = VREF × (1 + R1/R2). The internal error amplifier drives a Darlington output stage that can sink up to 100 mA. The sharp turn-on characteristic makes it suitable for replacing Zener diodes with much better precision and lower dynamic impedance.

Pin Nombre Tipo Función
1 REF Entrada Reference input (compares with internal 2.495V)
2 Ánodo Potencia Anode (connect to ground/lower rail)
3 Cátodo Salida Cathode (shunt current output, regulated terminal)
  • SMPS and AC-DC converter feedback loop with optocoupler isolation
  • Precision adjustable voltage reference replacing Zener diodes
  • On-board voltage regulation and power supply output control
  • Battery charger voltage monitoring and charge termination
  • Constant-current sink and current limit circuits
Fabricante Número de pieza Paquete Notas
TI TL431BCLP TO-92 0.5% accuracy (B grade)
TI TL431CLP TO-92 2% accuracy (standard grade), lower cost
ON Semiconductor KA431AZTA TO-92 Direct equivalent, 1% accuracy
STMicroelectronics TS431ACILT SOT-23-3 SMD version, 1% accuracy
TI TL431AIDBZR SOT-23-3 SMD version, A grade
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