UCC2810, UCC3810

SLUS162C − FEBRUARY 1999 − REVISED NOVEMBER 2004

3

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ELECTRICAL CHARACTERISTICS

All parameters are the same for both channels, −40

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

REFERENCE

VCC Output voltage

TJ = 25_C

4.925

5.000

5.075

V

VCC Output voltage

TJ = full range,

0 mA

≤ IREF ≤ 5 mA

4.85

5.00

5.10

V

Load regulation

0 mA

≤ IREF ≤ 5 mA

5

30

Line regulation

UVLO stop threshold voltage,

0.5 V

≤ VCC ≤ VSHUNT

12

mV

Output noise voltage(7)

10 Hz < f < 10 kHz,

TJ = 25_C

235

µV

Long term stability(7)

TA = 125_C,

1000 hours

5

mV

IO(SC)Output short circuit current

−8

−25

mA

OSCILLATOR

fOSC Oscillator frequency(2)

RT = 30 kΩ

CT = 120 pF

760

880

1000

kHz

fOSC Oscillator frequency(2)

RT = 150 kΩ

CT = 120 pF

190

220

250

kHz

Temperature stability(7)

2.5%

Peak voltage

2.5

Valley voltage

0.05

V

Peak-to-peak amplitude

2.25

2.45

2.65

V

SYNC threshold voltage

0.80

1.65

2.20

SYNC input current

SYNC = 5 V

30

µA

ERROR AMPLIFIER

VFB FB input voltage

COMP = 2.5 V

2.44

2.50

2.56

V

IFB

FB input bias current

±1

µA

Open loop voltage gain

60

73

dB

fGAIN Unity gain bandwidth(7)

2

MHz

ISINK Sink current, COMP

FB = 2.7 V,

COMP = 1 V

0.3

1.4

3.5

mA

ISRCESource current, COMP

FB = 1.8 V,

COMP = 4 V

−0.2

−0.5

−0.8

mA

Minimum duty cycle

COMP = 0 V

0%

Soft-start rise time, COMP

FB = 1.8 V,

rise from 0.5 V to (REF − 1.5 V)

5

ms

(1) For UCC3810, adjust VCC above the start threshold before setting at 10 V.

(2) Oscillator frequency is twice the output frequency. f

4

R

T

C

T

(3) Current sense gain A is defined by: A

+

DV

COMP

DV

CS

, 0 V

≤ VCS ≤ 0.8 V.

(4) Parameter measured at trip point of latch with FB = 0 V.

(5) CS blank time is measured as the difference between the minimum non-zero on-time and the CS-to-OUT delay.

(6) Start threshold voltage and VCC internal zener voltage track each other.

(7) Ensured by design. Not production tested.