Inicio Gestión de la energía AC/DC & DC/DC controllers (external FET)

TL1454A

ACTIVO

Circuito de control de doble canal de modulación por duración de pulsos (PWM)

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Funcionalidad similar a la del dispositivo comparado
LM5155 ACTIVO Controlador elevador no síncrono MOSFET de 1.5 A y VIN amplia de 2.2 MHz Up to 2.2MHz fSW, higher efficiency and up to 45V input operating voltage

Detalles del producto

Vin (min) (V) 3.6 Vin (max) (V) 20 Iout (max) (A) 3 Operating temperature range (°C) -20 to 85 Control mode Voltage mode Topology Boost, Buck, Flyback, Forward, SEPIC Rating Catalog Vout (min) (V) 1.26 Vout (max) (V) 20 Iq (typ) (A) 0.0035 Duty cycle (max) (%) 100
Vin (min) (V) 3.6 Vin (max) (V) 20 Iout (max) (A) 3 Operating temperature range (°C) -20 to 85 Control mode Voltage mode Topology Boost, Buck, Flyback, Forward, SEPIC Rating Catalog Vout (min) (V) 1.26 Vout (max) (V) 20 Iq (typ) (A) 0.0035 Duty cycle (max) (%) 100
PDIP (N) 16 181.42 mm² 19.3 x 9.4 SOIC (D) 16 59.4 mm² 9.9 x 6 SOP (NS) 16 79.56 mm² 10.2 x 7.8 SSOP (DB) 16 48.36 mm² 6.2 x 7.8 TSSOP (PW) 16 32 mm² 5 x 6.4
  • Two Complete PWM Control Circuits
  • Outputs Drive MOSFETs Directly
  • Oscillator Frequency . . . 50 kHz to 2 MHz
  • 3.6-V to 20-V Supply-Voltage Range
  • Low Supply Current . . . 3.5 mA Typ
  • Adjustable Dead-Time Control, 0% to 100%
  • 1.26-V Reference

  • Two Complete PWM Control Circuits
  • Outputs Drive MOSFETs Directly
  • Oscillator Frequency . . . 50 kHz to 2 MHz
  • 3.6-V to 20-V Supply-Voltage Range
  • Low Supply Current . . . 3.5 mA Typ
  • Adjustable Dead-Time Control, 0% to 100%
  • 1.26-V Reference

The TL1454A is a dual-channel pulse-width-modulation (PWM) control circuit, primarily intended for low-power, dc/dc converters. Applications include LCD displays, backlight inverters, notebook computers, and other products requiring small, high-frequency, dc/dc converters.

Each PWM channel has its own error amplifier, PWM comparator, dead-time control comparator, and MOSFET driver. The voltage reference, oscillator, undervoltage lockout, and short-circuit protection are common to both channels.

Channel 1 is configured to drive n-channel MOSFETs in step-up or flyback converters, and channel 2 is configured to drive p-channel MOSFETs in step-down or inverting converters. The operating frequency is set with an external resistor and an external capacitor, and dead time is continuously adjustable from 0 to 100% duty cycle with a resistive divider network. Soft start can be implemented by adding a capacitor to the dead-time control (DTC) network. The error-amplifier common-mode input range includes ground, which allows the TL1454A to be used in ground-sensing battery chargers as well as voltage converters.

The TL1454A is a dual-channel pulse-width-modulation (PWM) control circuit, primarily intended for low-power, dc/dc converters. Applications include LCD displays, backlight inverters, notebook computers, and other products requiring small, high-frequency, dc/dc converters.

Each PWM channel has its own error amplifier, PWM comparator, dead-time control comparator, and MOSFET driver. The voltage reference, oscillator, undervoltage lockout, and short-circuit protection are common to both channels.

Channel 1 is configured to drive n-channel MOSFETs in step-up or flyback converters, and channel 2 is configured to drive p-channel MOSFETs in step-down or inverting converters. The operating frequency is set with an external resistor and an external capacitor, and dead time is continuously adjustable from 0 to 100% duty cycle with a resistive divider network. Soft start can be implemented by adding a capacitor to the dead-time control (DTC) network. The error-amplifier common-mode input range includes ground, which allows the TL1454A to be used in ground-sensing battery chargers as well as voltage converters.

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Documentación técnica

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Tipo Título Fecha
* Data sheet Dual-Channel Pulse-Width-Modulation (PWM) Control Circuit datasheet (Rev. A) 25 sep 2002
Application note Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) 12 mar 2019
Application note Understanding Boost Power Stages In Switchmode Power Supplies 04 mar 1999
Application note Understanding Buck Power Stages In Switchmode Power Supplies 04 mar 1999
User guide Designing with the TL1454 PWM Controller User's Guide 08 dic 1998

Diseño y desarrollo

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Herramienta de diseño

CIRCUIT060010 — Circuito generador PWM

This circuit utilizes a triangle wave generator and comparator to generate a 500 kHz pulse-width modulated (PWM) waveform with a duty cycle that is inversely proportional to the input voltage. An op amp and comparator generate a triangle waveform which is applied to the inverting input of a second (...)
Guía del usuario: PDF
Paquete Pasadores Descargar
PDIP (N) 16 Ver opciones
SOIC (D) 16 Ver opciones
SOP (NS) 16 Ver opciones
SSOP (DB) 16 Ver opciones
TSSOP (PW) 16 Ver opciones

Pedidos y calidad

Información incluida:
  • RoHS
  • REACH
  • Marcado del dispositivo
  • Acabado de plomo/material de la bola
  • Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje

Soporte y capacitación

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