UC3842A, 43A UC2842A, 43A

2

MOTOROLA ANALOG IC DEVICE DATA

MAXIMUM RATINGS

Rating

Symbol

Value

Unit

Total Power Supply and Zener Current

(ICC + IZ)

30

mA

Output Current, Source or Sink (Note 1)

IO

1.0

A

Output Energy (Capacitive Load per Cycle)

W

5.0

µJ

Current Sense and Voltage Feedback Inputs

Vin

– 0.3 to + 5.5

V

Error Amp Output Sink Current

IO

10

mA

Power Dissipation and Thermal Characteristics

D Suffix, Plastic Package

Maximum Power Dissipation @ TA = 25°C

Thermal Resistance, Junction–to–Air

N Suffix, Plastic Package

Maximum Power Dissipation @ TA = 25°C

Thermal Resistance, Junction–to–Air

PD

R

θJA

PD

R

θJA

862

145

1.25

100

mW

°C/W

W

°C/W

Operating Junction Temperature

TJ

+ 150

°C

Operating Ambient Temperature

UC3842A, UC3843A

UC2842A, UC2843A

TA

0 to + 70

– 25 to + 85

°C

Storage Temperature Range

Tstg

– 65 to + 150

°C

unless otherwise noted.)

UC284XA

UC384XA

Characteristics

Symbol

Min

Typ

Max

Min

Typ

Max

Unit

REFERENCE SECTION

Reference Output Voltage (IO = 1.0 mA, TJ = 25°C)

Vref

4.95

5.0

5.05

4.9

5.0

5.1

V

Line Regulation (VCC = 12 V to 25 V)

Regline

–

2.0

20

–

2.0

20

mV

Load Regulation (IO = 1.0 mA to 20 mA)

Regload

–

3.0

25

–

3.0

25

mV

Temperature Stability

TS

–

0.2

–

–

0.2

–

mV/

°C

Total Output Variation over Line, Load, Temperature

Vref

4.9

–

5.1

4.82

–

5.18

V

Output Noise Voltage (f = 10 Hz to 10 kHz, TJ = 25°C)

Vn

–

50

–

–

50

–

µV

Long Term Stability (TA = 125°C for 1000 Hours)

S

–

5.0

–

–

5.0

–

mV

Output Short Circuit Current

ISC

– 30

– 85

– 180

– 30

– 85

– 180

mA

OSCILLATOR SECTION

Frequency

TJ = 25°C

TA = Tlow to Thigh

fosc

47

46

52

–

57

60

47

46

52

–

57

60

kHz

Frequency Change with Voltage (VCC = 12 V to 25 V)

∆fosc/∆V

–

0.2

1.0

–

0.2

1.0

%

Frequency Change with Temperature

TA = Tlow to Thigh

∆fosc/∆T

–

5.0

–

–

5.0

–

%

Oscillator Voltage Swing (Peak–to–Peak)

Vosc

–

1.6

–

–

1.6

–

V

Discharge Current (Vosc = 2.0 V)

TJ = 25°C

TA = Tlow to Thigh

Idischg

7.5

7.2

8.4

–

9.3

9.5

7.5

7.2

8.4

–

9.3

9.5

mA

NOTES: 1. Maximum Package power dissipation limits must be observed.

2. Adjust VCC above the Startup threshold before setting to 15 V.

3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible

Thigh = +70°C for UC3842A, UC3843A