TL1454A

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Dual-Channel Pulse-Width-Modulation (PWM) Control Circuit

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Product details

Parameters

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Package | Pins | Size

PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (D) 16 59 mm² 9.9 x 6 SOP (NS) 16 80 mm² 10.2 x 7.8 SSOP (DB) 16 48 mm² 6.2 x 7.8 TSSOP (PW) 16 22 mm² 4.4 x 5 TSSOP (PW) 16 22 mm² 2.9 x 1.6 open-in-new Find other Boost converters (integrated switch)

Features

  • 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

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Description

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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Technical documentation

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Type Title Date
* Datasheet Dual-Channel Pulse-Width-Modulation (PWM) Control Circuit datasheet (Rev. A) Sep. 25, 2002
Application notes Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) Mar. 12, 2019
Application notes Understanding Boost Power Stages In Switchmode Power Supplies Mar. 04, 1999
Application notes Understanding Buck Power Stages In Switchmode Power Supplies Mar. 04, 1999
User guides Designing with the TL1454 PWM Controller User's Guide Dec. 08, 1998

Design & development

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Design tools & simulation

DESIGN TOOLS Download
PWM generator circuit
CIRCUIT060010 — 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 (...)
document-generic User guide
Features
  • 5V Single supply with half-supply reference 
  • Input: -2V to 2V 
  • Output: 0V to 5V

CAD/CAE symbols

Package Pins Download
PDIP (N) 16 View options
SO (NS) 16 View options
SOIC (D) 16 View options
SSOP (DB) 16 View options
TSSOP (PW) 16 View options

Ordering & quality

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