UCC2800/2801/2802/2803/2804/2805Q1

LOW POWER BICMOS CURRENT MODE PWM

SGLS121C − JULY 2002 − REVISED APRIL 2008

5

POST OFFICE BOX 655303

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Undervoltage Lockout Section

UCC2800

6.6

7.2

7.8

Start threshold

See Note 6

UCC2801

8.6

9.4

10.2

V

Start threshold

See Note 6

UCC2802/04

11.5

12.5

13.5

V

UCC2803/05

3.7

4.1

4.5

UCC2800

6.3

6.9

7.5

Stop threshold

See Note 6

UCC2801

6.8

7.4

8

V

Stop threshold

See Note 6

UCC2802/04

7.6

8.3

9

V

UCC2803/05

3.2

3.6

4

UCC2800

0.12

0.3

0.48

Start to stop hysteresis

UCC2801

1.6

2

2.4

V

Start to stop hysteresis

UCC2802/04

3.5

4.2

5.1

V

UCC2803/05

0.2

0.5

0.8

Soft Start Section

COMP rise time

FB = 1.8 V,

Rise from 0.5 V to REF − 1 V

4

10

ms

Overall Section

Start-up current

VCC < Start Threshold

0.1

0.2

mA

Operating supply current

FB = 0 V,

CS = 0 V

0.5

1

mA

VCC internal zener voltage

ICC = 10 mA,

See Notes 6 and 8

12

13.5

15

V

VCC internal zener voltage minus start

threshold voltage

See Note 6

UCC2802/04

0.5

1.0

V

NOTES:

1. Adjust VCC above the start threshold before setting at 10 V.

2. Oscillator frequency for the UCC2800, UCC2802 and UCC2803 is the output frequency.

Oscillator frequency for the UCC2801, UCC2804 and UCC2805 is twice the output frequency.

3. Gain is defined by:

A =

DVCOMP

DVCS

0

v VCS v 0.8 V.

4. Parameter measured at trip point of latch with pin 2 at 0 V.

5. Total variation includes temperature stability and load regulation.

6. Start threshold, stop threshold, and zener shunt thresholds track one another.

7. Not production tested.

8. The device is fully operating in clamp mode as the forcing current is higher than the normal operating supply current.