UC3842B/3843B

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

4 of 11

www.unisonic.com.tw

QW-R103-012.D

PARAMETER

SYMBOL

RATINGS

UNIT

Total Power Supply and Zener Current

30

mA

Output Current, Source or Sink (note1)

Io

1.0

A

Output Energy (capacitive load per cycle)

W

5.0

μJ

Current Sense and Voltage Feedback Inputs

-0.3 ~ +5.5

V

Error Amp. Output Sink Current

10

mA

DIP-8

1250

mW

Power Dissipation

SOP-8

702

mW

Operating Junction Temperature

+150

°C

Operating Temperature

0 ~ +70

°C

Storage Temperature Range

-65 ~ +150

°C

Note Absolute maximum ratings are those values beyond which the device could be permanently damaged.

Absolute maximum ratings are stress ratings only and functional device operation is not implied.

THERMAL DATA

PARAMETER

SYMBOL

RATINGS

UNIT

DIP-8

100

°C/W

Thermal Resistance Junction to Ambient

SOP-8

178

°C/W

ELECTRICAL CHARACTERISTICS

(0

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

REFERENCE SECTION

Output Voltage

4.9

5.0

5.1

V

Line Regulation

2.0

20

mV

Load Regulation

Io=1.0mA ~ 20mA

3.0

25

mV

Temperature Stability

0.2

mV/

°C

Total Output Variation

Line, Load, Temperature

4.82

5.18

V

Output Noise Voltage

eN

50

uV

Long Term Stability

S

5

mV

Output Short Circuit Current

-30

-85

-180

mA

OSCILLATOR SECTION

Frequency

F

49

48

225

52

250

55

56

275

kHz

Frequency Change with Voltage

0.2

1.0

%

Frequency Change with

Temperature

0.5

%

Oscillator Voltage Swing(Peak to

Peak)

1.6

V

Discharge Current

Idischg

0

7.8

7.6

8.3

8.8

8.8

mA

ERROR AMPLIFIER SECTION

Voltage Feedback Input

Vo=2.5V

2.42

2.50

2.58

V

Input Bias Current

-0.1

-2.0

μA

Open Loop Voltage Gain

2 ≤Vo≤4V

65

90

dB

Unity Gain Bandwidth

0.7

1.0

MHz

Power Supply Rejection Ratio

PSRR

I2V≤Vcc≤25V

60

70

dB

Output Sink Current

2.0

12

mA

Output Source Current

-0.5

-1.0

mA

Output Voltage Swing High State

5.0

6.2

V