1 Features

? 28-V VDD recommended max operating ratings

? New undervoltage lockout options to support both

Si and SiC MOSFET applications

? Operating frequency: 1 MHz

? 50-μA Standby Current, 75-μA Maximum

? Low operating current: 1.3 mA (@ fOSC = 52 kHz)

? Fast, cycle-by-cycle overcurrent limiting: 35-ns

? Peak driving current: ±1-A. Rail-to-rail output:

– 25-ns rise time

– 20-ns fall time

? Initial trimmed 2.5-V error amplifier reference: ±1

? Pin-to-pin compatible to UCCx8C4x and drop-in

substitution

2 Applications

? General purpose single-ended DC-DC or off-line

isolated power converters

? Aux power supply in polyphase motor drives and

energy storage systems

? Flyback power supplies in solar power inverters

3 Description

The UCCx8C5x family are high-performance, currentmode

PWM controllers with low startup current.

The UCCx8C5x is an enhanced BiCMOS version

with pin-for-pin compatibility to the industry standard

UCCx8C4x family. With the VDD absolute maximum

rating extended from 20 V to 30 V for optimal

gate voltage design on 20-Vgs, 18-Vgs or 15-Vgs

SiC MOSFETs by the introduction of UCC28C56H/L,

UCC28C57H/L and UCC28C58/9, three new sets of

UVLO options allow SiC FET operating reliably while

avoiding thermal runaway. Existing UVLO options of

UCCx8C4x are maintained with improvements on

startup current, operating current and VDD absolute

maximum rating.

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 table below compares the improvements from

UCCx8C5x to UCCx8C4x.