3

UCC1810

UCC2810

UCC3810

UCC1810; –40

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Current Sense Section

Gain

(Note 6)

1.20

1.55

1.80

V/V

Maximum Input Signal

COMP = 5V (Note 7)

0.9

1.0

1.1

V

CS Input Bias Current

± 200

nA

CS to OUT Propagation Delay

CS steps from 0V to 1.2V, COMP = 2.5V

75

ns

CS Blank Time

(Note 8)

55

ns

CS Overcurrent Threshold

1.35

1.55

1.85

V

COMP to CS Offset

CS = 0V

0.65

0.95

1.4

V

PWM Section

Maximum Duty Cycle

45

49

50

%

Maximum Duty Cycle

40

45

48

%

Minimum On Time

CS =1.2V, COMP = 5V

130

ns

Output Section

OUT Low Level

0.12

0.42

V

0.48

1.10

V

0.7

1.20

V

OUT High Level

0.15

0.42

V

1.20

2.30

V

OUT Rise Time

20

50

ns

OUT Fall Time

30

60

ns

Undervoltage Lockout Section

Start Threshold

9.9

11.3

13.2

V

Stop Threshold

7.5

8.3

9.5

V

Start to Stop Hysteresis

1.7

3.0

4.7

V

ENABLE2 Input Bias Current

ENABLE2 = 0V

–20

–35

–55

µA

ENABLE2 Input Threshold

Voltage

0.80

1.53

2.00

V

Overall Section

Startup Current

0.15

0.25

mA

Operating Supply Current,

Outputs Off

2.0

3.0

mA

Operating Supply Current,

Outputs On

3.2

5.1

mA

Operating Supply Current,

Outputs On

8.5

14.5

mA

11.0

12.9

14.0

V

Start Threshold Voltage

0.4

1.2

V

Note 5: Oscillator frequency is twice the output frequency.

F

RT

CT

OSC

≈

×

4

Note 6: Current Sense Gain A is defined by:

A

VCOMP

VCS

VCS

V

=≤

≤

∆

∆

00 8

.

.

Note 7: Parameter measured at trip point of latch with FB = 0V.

Note 8: CS Blank Time is measured as the difference between the minimum non-zero on-time and the CS to OUT delay.

Note 10: Guaranteed by design. Not 100% tested in production.