TEXAS INSTRUMENTS -TL1454A TL1454AY DUAL-CHANNEL PULSE-WIDTH-MODULATION (PWM) CONTROL CIRCUIT handbook
Update: 30 September, 2023
The TL1454A/TL1454AY 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-sensitive applications.
Brand: TEXAS
File format: PDF
Size: 585 KB
MD5 Checksum: 5494B7CD07B5FF48C115D0C6367FA872
Publication date: 04 May, 2012
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