UCC2817A, UCC2818A

UCC3817A, UCC3818A

SLUS577B − SEPTEMBER, 2003 − REVISED FEBRUARY 2006

2

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DESCRIPTION (CONTINUED)

The UCC3817A/18A family of PFC Controllers is directly pin for pin compatible with the UCC3817/18 family of

devices. Only the output stage of UCC3817A family has been modified to allow use of a smaller external gate

drive resistor values. For some power supply designs where an adequately high enough gate drive resistor can

not be used, the UCC3817A/18A family offers a more robust output stage at the cost of increasing the internal

gate resistances. The gate drive of the UC3817A/18A family however remains strong at

±1.2 A of peak current

capability.

UCC3817A offers an on-chip shunt regulator with low start-up current, suitable for applications utilizing a

bootstrap supply. UCC3818A is intended for applications with a fixed supply (VCC). Both devices are available

in the 16-pin D, N and PW packages.

PIN CONNECTION DIAGRAM

D, N, AND PW PACKAGES

(TOP VIEW)

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

GND

PKLMT

CAOUT

CAI

MOUT

IAC

VAOUT

VFF

DRVOUT

VCC

CT

SS

RT

VSENSE

OVP/EN

VREF

AVAILABLE OPTIONS TABLE

PACKAGE DEVICES

T

= T

SOIC (D) PACKAGE(1)

PDIP (N) PACKAGE

TSSOP (PW) PACKAGE(1)

TA = TJ

Turn-on

Threshold

16 V

Turn-on

Threshold

10.2 V

Turn-on

Threshold

16 V

Turn-on

Threshold

10.2 V

Turn-on

Threshold

16 V

Turn-on

Threshold

10.2 V

−40

°C to 85°C

UCC2817AD

UCC2818AD

UCC2817AN

UCC2818AN

UCC2817APW

UCC2818APW

0

°C to 70°C

UCC3817AD

UCC3818AD

UCC3817AN

UCC3818AN

UCC3817APW

UCC3818APW

NOTES: (1) The D and PW packages are available taped and reeled. Add R suffix to the device type (e.g. UCC3817ADR) to order quantities

of 2,500 devices per reel (D package) and 2,000 devices per reel (for PW package). Bulk quantities are 40 units (D package) and

90 units (PW package) per tube.

THERMAL RESISTANCE TABLE

PACKAGE

θjc(°C/W)

θja(°C/W)

SOIC−16 (D)

22

40 to 70 (1)

PDIP−16 (N)

12

25 to 50 (1)

TSSOP−16 (PW)

14 (2)

123 to 147 (2)

NOTES: (1) Specified

θja (junction to ambient) is for devices mounted to 5-inch2 FR4 PC board with one ounce copper

where noted. When resistance range is given, lower values are for 5 inch2 aluminum PC board. Test PWB

was 0.062 inch thick and typically used 0.635-mm trace widths for power packages and 1.3-mm trace

widths for non-power packages with a 100-mil x 100-mil probe land area at the end of each trace.

(2) Modeled data. If value range given for

θja, lower value is for 3x3 inch. 1 oz internal copper ground plane,

higher value is for 1x1-inch. ground plane. All model data assumes only one trace for each non-fused

lead.