UC3842B datasheet(4/11 Pages) UTC

4 / 11 page

UC3842B/3843B

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

4 of 11

www.unisonic.com.tw

QW-R103-012.D

ABSOLUTE MAXIMUM RATINGS(Ta=25°C)

PARAMETER

SYMBOL

RATINGS

UNIT

Total Power Supply and Zener Current

(ICC + Iz)

Output Current, Source or Sink (note1)

1.0

Output Energy (capacitive load per cycle)

5.0

μJ

Current Sense and Voltage Feedback Inputs

VIN

-0.3 ~ +5.5

Error Amp. Output Sink Current

IO(SINK)

DIP-8

1250

Power Dissipation

SOP-8

702

Operating Junction Temperature

+150

°C

Operating Temperature

TOPR

0 ~ +70

°C

Storage Temperature Range

TSTG

-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

θJA

178

°C/W

ELECTRICAL CHARACTERISTICS

°C ≤TA≤70°C, VCC=15V [note 2], RT=10k, CT=3.3nF, unless otherwise specified)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

REFERENCE SECTION

Output Voltage

VREF

Io=1.0mA, TJ =25°C

4.9

5.0

5.1

Line Regulation

ΔVLINE

VCC=12V ~ 25V

2.0

Load Regulation

ΔVLOAD

Io=1.0mA ~ 20mA

3.0

Temperature Stability

0.2

mV/

°C

Total Output Variation

VREF

Line, Load, Temperature

4.82

5.18

Output Noise Voltage

F=10kHz ~ 10Hz, TJ =25°C

Long Term Stability

TA=125°C,1000Hrs

Output Short Circuit Current

ISC

-30

-85

-180

OSCILLATOR SECTION

Frequency

TJ =25°C

Ta=0°C ~ 70°C

TJ =25°C (RT=6.2k,CT=1.0nF)

225

250

275

kHz

Frequency Change with Voltage

ΔfOSC/ΔV 12 ≤ VCC ≤25V

0.2

1.0

Frequency Change with

Temperature

ΔfOSC/ΔT 0°C ≤TA ≤70°C

0.5

Oscillator Voltage Swing(Peak to

Peak)

VOSC

1.6

Discharge Current

Idischg

TJ =25°C

°C ≤TA ≤70°C

7.8

7.6

8.3

8.8

ERROR AMPLIFIER SECTION

Voltage Feedback Input

VFB

Vo=2.5V

2.42

2.50

2.58

Input Bias Current

II(BIAS)

VFB=5.0V

-0.1

-2.0

μA

Open Loop Voltage Gain

GVO

2 ≤Vo≤4V

Unity Gain Bandwidth

GBW

TJ =25°C

0.7

1.0

MHz

Power Supply Rejection Ratio

PSRR

I2V≤Vcc≤25V

Output Sink Current

ISINK

Vo=1.1V,VFB =2.7V

2.0

Output Source Current

ISOURCE

Vo=5.0V,VFB=2.3V

-0.5

-1.0

Output Voltage Swing High State

VOH

VFB=2.3V, RL=15k to GND

5.0

6.2

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