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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

UC2856Q

SGLS265 – NOVEMBER 2004

UNIT

Supply voltage

40 V

Collector supply voltage

40 V

DC

0.5 A

Output current (sink or source)

Pulse (0.5 ms)

2 A

Error amplifier input voltage

–0.3 V to VIN

Shutdown input voltage

–0.3 V to 10 V

Current sense input voltage

–0.3 V to 3 V

SYNC output current

±10 mA

Error amplifier output current

-5 mA

Soft start sink current

50 mA

Oscillator charging current

5 mA

1 W

Power dissipation

2 W

Operating junction temperature range

–55

°C to 150°C

Storage temperature range

–65

°C to 150°C

Lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds

300

°C

(1)

Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating

conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2)

Unless otherwise indicated, voltages are reference to ground and currents are positive into and negative out of the specified terminals.

T

(1)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

REFERENCE SECTION

Output voltage

5.05

5.1

5.15

V

Line regulation voltage

VIN = 8 V to 40 V

20

mV

Load regulation voltage

15

mV

Total output variation

Line, Load, and Temperature

5

5.2

V

Output noise voltage

f = 10 Hz to 10 kHz,

50

µV

Long term stability

5

25

mV

Short circuit current

VREF = 0 V

–25

–45

–65

mA

OSCILLATOR SECTION

180

200

220

Initial accuracy

kHz

170

230

Voltage stability

VIN = 8 V to 40 V

2%

VCT = 2 V,

7.5

8

8.8

Discharge current

mA

VCT = 2 V

6.7

8

8.8

Sync output high level voltage

2.4

3.6

V

Sync output low level voltage

0.2

0.4

V

Sync input high level voltage

CT = 0 V, RT = VREF

2

1.5

V

Sync input low level voltage

CT = 0 V, RT = VREF

1.5

0.8

V

Sync input current

1

10

µA

Sync delay to outputs

50

100

ns

(1)

All voltages are with respect to GND. Currents are positive into, negative out of the specified terminal.

(2)

This parameter, although specified over the recommended operating conditions, is not 100% tested in production.

3