UCC2891, UCC2892

UCC2893, UCC2894

SLUS542F − OCTOBER 2003 − REVISED JULY 2009

3

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THERMAL RESISTANCE INFORMATION

PACKAGE

THERMAL RESISTANCE

UNITS

SOIC−16 (D)

θjc

36.9 to 38.4

°C/W

SOIC−16 (D)

θja (0 LFM)

73.1 to 111.6

°C/W

TSSOP−16 (PW)

θjc

33.6 to 35.0

°C/W

TSSOP−16 (PW)

θja (0 LFM)

108.4 to 147.0

°C/W

PIN ASSIGNMENTS

RTDEL

RTON

RTOFF

VREF

SYNC

GND

CS

RSLOPE

LINEOV

LINEUV

VDD

OUT

AUX

PGND

SS/SD

FB

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

UCC2892 AND UCC2894

D AND PW PACKAGE

(TOP VIEW)

RTDEL

RTON

RTOFF

VREF

SYNC

GND

CS

RSLOPE

VIN

LINEUV

VDD

OUT

AUX

PGND

SS/SD

FB

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

UCC2891 AND UCC2893

D and PW PACKAGEs

(TOP VIEW)

ELECTRICAL CHARACTERISTICS

VDD = 12 V(1), 1-µF capacitor from VDD to GND, 0.01-µF capacitor from VREF to GND, RON = ROFF = 75 kΩ, RDEL = 10 kΩ,

RSLOPE = 50 kΩ, −40 °C ≤ TA = TJ ≤ 125°C (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

OVERALL

ISTARTUP Start-up current

VDD < VUVLO

300

500

µA

IDD

Operating supply current(1)(2)

VFB = 0 V,

VCS = 0 V,

Outputs not switching

2

3

mA

HIGH-VOLTAGE BIAS SECTION (UCC2891, UCC2893)

IDD−ST

VDD startup current

Current available from VDD during Start-

up, VIN = 36 V, TA = −40°C to 85°C (3)

4

11

mA

IVIN

JFET leakage current

VIN = 120 V; VDD = 14 V

75

µA

UNDERVOLTAGE LOCKOUT

Start threshold voltage(1)

12.2

12.7

13.2

Minimum operating voltage after start

7.6

8.0

8.4

V

Hysteresis

4.4

4.7

5.0

V

LINE MONITOR

VLINEUV Line UV and Line OV voltage threshold

1.243

1.268

1.293

V

ILINEHYS Line UV and Line OV hysteresis current

11.8

12.5

14.5

µA

SOFT-START

ISS

Charge current

RTON = 75 kΩ

−10.5

−18.5

A

ISS

Discharge current

RTON = 75 kΩ

10.5

18.5

µA

VSS/SD

Discharge/shutdown threshold voltage

0.4

0.5

0.6

V

(1) Set VDD above the start threshold before setting at 12 V.

(2) Does not include current of the external oscillator network.

(3) The power supply starts with IDD−ST load on VDD, part will start up with no load up to 125°C. For more detailed information, see pin descriptions

for VIN and VDD.

(4) ISSC and ISS/SD are directly proportional to IRON. See equation 7.