UCC2540

SLUS539A − JUNE 2004 − REVISED AUGUST 2004

4

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ELECTRICAL CHARACTERISTICS

VDD = 12 V, 1-µF capacitor from VDD to GND, 1-µF capacitor from BST to SW, 1-µF capacitor from REF to GND, 0.1-µF and 2.2-µF capacitors

from VDRV to PGND, fSYNCIN = 200 kHz, TA = TJ = −40°C to 105°C, (unless otherwise noted).

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

OVERALL

IVDD

Operating current

DC

8

11

13

mA

IVDD

Operating current

fS = 200 kHz,

CLOAD = 2.2 nF

9

12

30

mA

UNDERVOLTAGE LOCKOUT

VVDD

Start threshold voltage

MODE 1

8.0

8.5

9.0

VVDD

Stop threshold voltage

MODE 1

7.5

8.0

8.5

VVDD

Hysteresis

MODE 1

0.3

0.5

0.8

VVDRV

Start threshold voltage

MODE 2,

VVDD = 4 V

4.30

4.65

4.85

VVDRV

Stop threshold voltage

MODE 2

4.0

4.3

4.6

V

VVDRV

Hysteresis

MODE 2

0.15

0.35

0.55

V

VREF

Start threshold voltage

MODE 3

VVDD= VVDRV= 2.7 V

2.75

3.00

3.20

VREF

Stop threshold voltage

MODE 3

2.25

2.50

2.70

VREF

Hysteresis

MODE 3

0.3

0.5

0.8

VOLTAGE REFERENCE (REF)

VREF

Reference output voltage

TA = 25°C

3.28

3.30

3.32

V

VREF

Reference output voltage

Total variation

3.2

3.3

3.4

V

ISC

Short circuit current

VREF = 0 V,

TA = 25°C

10

13

20

mA

Line regulation

5.25 V

≤ VREF ≤ 7.2 V

0

1.5

15

mV

Load regulation

0 mA

≤ IREF ≤ 5 mA

0

30

70

mV

PWM (RAMP)

DMIN

Minimum duty cycle

0%

VRAMP

Offset voltage

0.10

0.25

0.45

V

Timeout threshold voltage

2.3

2.5

2.8

V

tDEAD

G1 deadtime at maximum duty cycle ratio

fSYNC = 200 kHz

150

175

200

ns

IRAMP

Ramp charge current

RRSET = 10 kΩ

−325

−300

−275

µA

CURRENT ERROR AMPLIFIER

VCEA+

Offset voltage

Total variation

45

50

55

mV

GBW

Gain bandwidth(3)

3

4

MHz

VOL

Low-level output voltage

ICOMP = 0 A,

VCEA− = 3.3 V,

VVEA− = 2.0 V

0.1

V

VOL

Low-level output voltage

ICOMP = 200 µA, VCEA− = 1.5 V

VVEA− = 1 V

0

0.60

0.83

V

VOH

High-level output voltage

ICOMP = 0 A,

VCEA− = 0 V,

VVEA− = 1 V

2.2

2.5

3.0

V

AVOL

Open loop

60

100

140

dB

IBIAS

Bias current

−200

−80

−10

nA

ISINK

Sink current

VCOMP = 1.0 V,

VCEA− = 1.5 V,

VVEA− = 0 V

0.35

0.80

1.70

mA

CMR

Common mode input range(3)

0

2

V

(3) Ensured by design. Not production tested.