UCC28C53_V01 datasheet(6/48 Pages) TI

6 / 48 page

7.4 Thermal Information

THERMAL METRIC(1)

UCC28C5x, UCC38C5x

UNIT

D (SOIC)

DGK (VSSOP)

8 PINS

RθJA

Junction-to-ambient thermal resistance

107.7

159.9

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

52.7

°C/W

RθJB

Junction-to-board thermal resistance

48.3

80.5

°C/W

ψJT

Junction-to-top characterization parameter

11.3

6.2

°C/W

ψJB

Junction-to-board characterization parameter

47.8

79.1

°C/W

(1)

For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report.

7.5 Electrical Characteristics

VVDD = 20V for UCC28C56H/L, UCC28C57H/L, and UCC28C58/9, VVDD = 15 V for all other device options, RRT = 10 kΩ,

CCT = 3.3 nF, CVDD = 0.1 µF and no load on the outputs, –40°C ≤ TJ ≤ 125°C for the UCC28C5x, 0°C ≤ TJ ≤ 85°C, for the

UCC38C5x (unless otherwise noted).

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX UNIT

REFERENCE

VVREF

VREF voltage, initial accuracy

TA = 25°C, IOUT = 1 mA

4.95

5.05

Line regulation

12 V ≤ VVDD ≤ 18 V

0.2

Load regulation

1 mA to 20 mA

Temperature stability(2)

0.2

0.4 mV/°C

Total output variation(2)

4.85

5.15

VREF noise voltage(2)

10 Hz to 10 kHz, TA = 25°C

µV

Long term stability(2)

1000 hours, TA = 125°C

IVREF

Output short circuit

–55

–45

–30

OSCILLATOR

fOSC

Initial accuracy(3)

TA = 25°C

50.5

kHz

Voltage stability

12 V ≤ VVDD ≤ 18 V

0.2%

Temperature stability(2)

TA(MIN) to TA(MAX)

2.5%

Amplitude

RT/CT pin peak-to-peak voltage

1.9

Discharge current(4)

TA = 25°C, VRT/CT = 2 V

7.7

8.4

VRT/CT = 2 V

7.2

8.4

9.5

ERROR AMPLIFIER

VFB

Feedback input voltage, initial accuracy VCOMP = 2.5 V, TA = 25°C

2.475

2.5

2.525

Feedback input voltage, total variation

VCOMP = 2.5 V

2.45

2.5

2.55

IFB

Input bias current

VFB = 5 V

–0.1

–2

µA

AVOL

Open-loop voltage gain

2 V ≤ VOUT ≤ 4 V

Unity gain bandwidth(2)

1.5

MHz

PSRR

Power supply rejection ratio

12 V ≤ VVDD ≤ 18 V

Output sink current

VFB = 2.7 V, VCOMP = 1.1 V

Output source current

VFB = 2.3 V, VCOMP = 5 V

–0.5

–1

VOH

High-level COMP voltage

VFB = 2.7 V, RCOMP = 15 kΩ COMP to GND

VREF–

0.2

VOL

Low-level COMP voltage

VFB = 2.7 V, RCOMP = 15 kΩ COMP to VREF

0.1

1.1

CURRENT SENSE

ACS

Gain(5) (1)

2.85

3.15

V/V

VCS

Maximum input signal

VFB < 2.4 V

0.9

1.1

UCC28C53, UCC28C54, UCC28C55

UCC28C56H, UCC28C57H, UCC28C57L, UCC28C59

SLUSER8 – JUNE 2022

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