UCC2808N-1G4 datasheet(5/22 Pages) TI1

Part #	UCC2808N-1G4

Description	Low Power Current Mode Push-Pull PWM

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Manufacturer	TI1 [Texas Instruments]

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COMP

CS

V

A

,0

V

0.4V

V

D

=

£

D

(3)

Gain is defined by:

0 v VCS v 0.4 V

UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2

www.ti.com

SLUS168E – APR 1999 – REVISED AUGUST 2015

Electrical Characteristics (continued)

TA = 0°C to 70°C for the UCC3808-x, –40°C to 85°C for the UCC2808-x and –55°C to 125°C for the UCC1808-x, VDD = 10

V

(1), 1-μF capacitor from VDD to GND, R = 22 kΩ , C = 330 pF, T

A = TJ , (unless otherwise specified)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

COMP source current

FB = 1.3 V, COMP = 3.5 V

–0.25

–0.5

mA

PWM SECTION

Maximum duty cycle

Measured at OUTA or OUTB

48%

49%

50%

Minimum duty cycle

COMP = 0 V

0%

CURRENT SENSE SECTION

Gain(3)

1.9

2.2

2.5

V/V

Maximum input signal

COMP = 5 V (4)

0.45

0.5

0.55

V

COMP = 3.5 V, CS from 0 to 600

CS to output delay

100

200

ns

mV

CS source current

–200

nA

Over current threshold

0.7

0.75

0.8

V

COMP to CS offset

CS = 0 V

0.35

0.8

1.2

V

OUTPUT SECTION

OUT low level

I = 100 mA

0.5

1

V

OUT high level

I = – 50 mA, VDD – OUT

0.5

1

V

Rise time

CL = 1 nF

25

60

ns

Fall time

CL = 1 nF

25

60

ns

UNDERVOLTAGE LOCKOUT SECTION

UCCx808-1 (1)

11.5

12.5

13.5

Start threshold

V

UCCx808-2

4.1

4.3

4.5

UCCx808-1

7.6

8.3

9

Minimum operating voltage after

V

start

UCCx808-2

3.9

4.1

4.3

UCCx808-1

3.5

4.2

5.1

Hysteresis

V

UCCx808-2

0.1

0.2

0.3

SOFT-START SECTION

COMP rise time

FB = 1.8 V, rise from 0.5 V to 4 V

3.5

20

ms

OVERALL SECTION

Start-up current

VDD < start threshold

130

260

µA

Operating supply current

FB = 0 V, CS = 0 V (5) (1)

1

2

mA

VDD zener shunt voltage

IDD = 10 mA (6)

13

14

15

V

(4)

Parameter measured at trip point of latch with FB at 0 V.

(5)

For UCCx808 – 1, set VDD above the start threshold before setting at 10 V

(6)

Start threshold and Zener shunt threshold track one another.

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Product Folder Links: UCC2808-1 UCC2808-2 UCC3808-1 UCC3808-2

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