UC3863

LINEAR INTEGRATED CIRCUIT

UNISONIC TECHNOLOGIES CO., LTD

4 of 9

www.unisonic.com.tw

QW-R103-058.H



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.



OPERAT I N G RAN GE

PARAMETER

SYMBOL

RATINGS

UNIT

Supply Voltage

9 ~ 22

V



Ω，unless otherwise specified)

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

Ω

60

65

70

KHz

Switch Frequency

Power-Saving

Before enter burst mode

23

KHz

Duty Cycle

70

78

85

%

Frequency Hopping

-4

+4

%

Frequency VDD Stability

5

%

Frequency Temperature Stability

T=-20~100°C

1.5

5

%

RI Resistor Value Range

50

100

150

K

Ω

Feedback short current

240

uA

Softstart time

2

mS

PROTECTION SECTION

VCC Over Voltage Protection Threshold

26

27

28

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

≥60%

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