UCC2808A1, UCC2808A2, UCC3808A1, UCC3808A2

LOW POWER CURRENT MODE PUSHPULL PWM

SLUS456D − APRIL 1999 - REVISED AUGUST 2002

2

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description (continued)

The UCC3808A family offers a variety of package options, temperature range options, and choice of undervoltage

lockout levels. The family has UVLO thresholds and hysteresis options for off-line and battery powered systems.

Thresholds are shown in the table below.

The UCC3808A is an enhanced version of the UCC3808 family. The significant difference is that the A versions

feature an internal discharge transistor from the CS pin to ground, which is activated each clock cycle during the

oscillator dead time. The feature discharges any filter capacitance on the CS pin during each cycle and helps minimize

filter capacitor values and current sense delay.

ORDERING INFORMATION

TA = TJ

Packaged Devices

TA = TJ

UVLO Option

SOIC (D)

{

PDIP (N)

TSSOP (PW)

{

−40

°C to 85°C

12.5 V/8.3 V

UCC2808AD−1

UCC2808AN−1

UCC2808APW−1

−40

°C to 85°C

4.3 V/4.1 V

UCC2808AD−2

UCC2808AN−2

UCC2808APW−2

0

°C to 70°C

12.5 V/8.3 V

UCC3808AD−1

UCC3808AN−1

UCC3808APW−1

0

°C to 70°C

4.3 V/4.1 V

UCC3808AD−2

UCC3808AN−2

UCC3808APW−2

† D (SOIC−8) and PW (TSSOP−8) packages are available taped and reeled. Add TR suffix to device type (e.g.

UCC3808ADTR−1) to order quantities of 2500 devices per reel for SOIC-8 and 2000 devices per reel for TSSOP-8.

Supply voltage (IDD

≤ 10 mA)

15 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Supply current

20 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OUTA/OUTB source current (peak)

−0.5 A

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OUTA/OUTB sink current (peak)

1.0 A

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Analog inputs (FB, CS)

−0.3 V to VDD + 0.3 V, not to exceed 6 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

650 mW

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

400 mW

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−65

°C to150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−55

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature (soldering, 10 sec.)

300

°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

† Currents are positive into, negative out of the specified terminal. Consult Packaging Section of the Power Supply Control Data Book (TI Literature

Number SLUD003) for thermal limitations and considerations of packages.

VDD = 10 V (see Note 6), 1-

otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Oscillator Section

Oscillator frequency

175

194

213

kHz

Oscillator amplitude/VDD

See Note 1

0.44

0.5

0.56

V/V

NOTES:

1. Measured at RC. Signal amplitude tracks VDD.

6. For UCCx808A−1, set VDD above the start threshold before setting at 10 V.