UC3863

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

4 of 10

www.unisonic.com.tw

QW-R103-058.F



PARAMETER

SYMBOL

RATINGS

UNIT

Supply Voltage

30

V

Input Voltage to FB Pin

-0.3 ~ 7

V

Input Voltage to CS Pin

-0.3 ~ 7

V

Junction Temperature

+150

C

Operating Temperature

-40 ~ +125

°C

Storage Temperature

-50 ~ +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.



OPERATING RANGE

PARAMETER

SYMBOL

RATINGS

UNIT

Supply Voltage

9 ~ 22

V



PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY SECTION

Start Up Current

2.5

20

μA

IC Operating current

1.2

2.5

mA

VDD Zener Clamp Voltage

27

28.5

30

V

UNDER-VOLTAGE LOCKOUT SECTION

Start Threshold Voltage

12

13.5

15

V

Min. Operating Voltage

7

8

9

V

CONTROL SECTION

4.8

5.1

V

PWM Input Gain

3

V/V

Burst-Mode Out FB Voltage

1.6

V

Reduce-Frequency end FB Voltage

2.55

V

Burst-Mode Enter FB Voltage

1.5

V

Normal

60

65

70

KHz

Switch Frequency

Power-Saving

Before enter burst mode

23

KHz

Duty Cycle

70

78

85

%

Frequency Hopping

±4

%

Frequency VDD Stability

5

%

Frequency Temperature Stability

T=-20~100°C

1.5

5

%

RI Resistor Value Range

50

100

150

KΩ

Feedback short current

240

uA

Softstart time

2

mS

PROTECTION SECTION

VCC Over Voltage Protection Threshold

22

24

26

V

FB PIN Over Load Protection Threshold

4.45

V

Over Load Protection Delay-Time

40

55

70

mS

OTP threshold

135

°C

CURRENT LIMITING SECTION

Peak Current Flat Threshold Voltage

0.90

0.95

1.00

V

Peak Current Valley Threshold Voltage

0.58

0.63

0.68

Lead Edge Blanking Time

350

ns

DRIVER OUTPUT SECTION

Output Voltage Low State

0.8

V

Output Voltage High State

11

V

Output Voltage Rise Time

100

ns

Output Voltage Fall Time

60

ns