UCC28C53_V01 datasheet(13/48 Pages) TI

13 / 48 page

8 Detailed Description

8.1 Overview

The UCCx8C5x series of control integrated circuits provide the features necessary to implement AC-DC or

‑to-DC fixed-frequency current-mode control schemes with a minimum number of external components.

Protection circuitry includes undervoltage lockout (UVLO) and current limiting. Internally implemented circuits

include a start-up current of less than 75 µA, a precision reference trimmed for accuracy at the error amplifier

input, logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-

limit control, and an output stage designed to source or sink high-peak current. The output stage, suitable for

driving N-channel MOSFETs, is low when it is in the OFF state. The oscillator contains a trimmed discharge

current that enables accurate programming of the maximum duty cycle and dead time limit, making this device

suitable for high-speed applications.

Major differences between members of this series are the UVLO thresholds, acceptable ambient temperature

range, maximum duty cycle and frequency. Typical UVLO thresholds of 14.5 V (ON) and 9 V (OFF) on the

UCCx8C52 and UCCx8C54 devices make them ideally suited to off-line AC-DC applications. The corresponding

typical thresholds for the UCCx8C53 and UCCx8C55 devices are 8.4 V (ON) and 7.6 V (OFF), making them

ideal for use with regulated input voltages used in DC-DC applications. The UCCx8C50 and UCCx8C51

feature a start-up threshold of 7 V and a turnoff threshold of 6.6 V (OFF), which makes them suitable for

battery-powered applications. The UCC28C56H/L, UCC28C57H/L, UCC28C58 and UCC28C59 operate with

higher start-up thresholds for them suitably to work with SiC MOSFETs which often being used in high-voltage

and high-power traction inverter applications. The UCC28C56H and UCC28C57H are with a start-up threshold

18.8 V (ON) and 15.5 V (OFF). The UCC28C56L and UCC28C57L are with a start-up threshold 18.8V (ON)

and 14.5 V (OFF). The UCC28C58 and UCC28C59 are with a start-up threshold 16 V (ON) and 12.5 V

(OFF). The UCCx8C50, UCCx8C52, UCCx8C53, UCC28C56H/L and UCC28C58 devices operate to duty cycles

approaching 100%. The UCCx8C51, UCCx8C54, UCCx8C55, UCC28C57H/L and UCC28C59 obtain a duty

cycle from 0% to 50% by the addition of an internal toggle flip-flop, which blanks the output off every other

clock cycle. The UCC28C5x series is specified for operation from –40°C to 125°C, and the UCC38C5x series

is specified for operation from 0°C to 85°C. The switching frequency (fSW) of the UCCx8C50, UCCx8C52,

UCCx8C53, UCC28C56H/L and UCC28C58 gate drive is equal to fOSC; the switching frequency of the

UCCx8C51, UCCx8C54, UCCx8C55, UCC28C57H/L and UCC28C59 is equal to half of the fOSC.

The UCC28C5x and UCC38C5x series are an enhanced replacement with pin-to-pin compatibility to the

BiCMOS UCCx8C4x, and to the bipolar UC284x, UC384x, UC284xA, and UC384xA families. The new series

offers improved performance when compared to older bipolar devices and other competitive BiCMOS devices

with similar functionality. These improvements generally consist of tighter specification limits that are a subset

of the older product ratings, maintaining drop-in capability. In new designs, these improvements can reduce the

component count or enhance circuit performance when compared to the previously available devices.

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UCC28C53, UCC28C54, UCC28C55

UCC28C56H, UCC28C57H, UCC28C57L, UCC28C59

SLUSER8 – JUNE 2022

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Product Folder Links: UCC28C53 UCC28C54 UCC28C55 UCC28C56H UCC28C57H UCC28C57L UCC28C59

UCC28C53 датащи(PDF) 13 Page - Texas Instruments