Startseite Energiemanagement AC/DC & DC/DC controllers (external FET)
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AC/DC & DC/DC controllers (external FET)

TL1454A

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Zweikanaliger PWM-Steuerkreis

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TL1454A

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Produktdetails

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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Technische Dokumentation

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Typ Titel Datum
* 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 Mär 2019
Application note Understanding Boost Power Stages In Switchmode Power Supplies 04 Mär 1999
Application note Understanding Buck Power Stages In Switchmode Power Supplies 04 Mär 1999
User guide Designing with the TL1454 PWM Controller User's Guide 08 Dez 1998

Design und Entwicklung

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Designtool

CIRCUIT060010 — PWM-Generatorschaltung

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 (...)
Benutzerhandbuch: PDF
Optionen anzeigen
Gehäuse Pins Herunterladen
PDIP (N) 16 Optionen anzeigen
SOIC (D) 16 Optionen anzeigen
SOP (NS) 16 Optionen anzeigen
SSOP (DB) 16 Optionen anzeigen
TSSOP (PW) 16 Optionen anzeigen
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