UB3846

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

4 of 10

www.unisonic.com.tw

QW-R103-053.C

PARAMETER

SYMBOL

RATINGS

UNIT

Supply Voltage

25

V

Zener Clamp

28

V

Zener Current

10

mA

Input Voltage to FB Pin

7

V

Input Voltage to CS Pin

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

8.2 ~ 21

V

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY SECTION

Start Up Current

22

45

μA

IC Operating current

FB PIN OPEN

7

9

mA

UNDER-VOLTAGE LOCKOUT SECTION

Start Threshold Voltage

13.5

14.2

15

V

Min. Operating Voltage

7.5

8.2

9

V

Hysteresis

6

V

INTERNAL VOLTAGE REFERENCE

Reference Voltage

6.3

6.5

6.7

V

CONTROL SECTION

0.5

V

4.4

V

Burst-Mode Out FB Voltage

1.7

V

Reduce-Frequency end FB Voltage

1.6

V

Burst-Mode Enter FB Voltage

1.5

V

Switch Frequency

Normal

FB PIN OPEN

61

68

75

kHz

Power-Saving

Before enter burst mode

24

31

kHz

Duty Cycle

68

74

80

%

0

%

Frequency Hopping

±1.5

±3

±4.5

kHz

5

%

Frequency Variation VS Temperature Deviation

T=-40 to 105°C

5

%

Feedback Resistor

16

21

26

kΩ

PROTECTION SECTION

OVP threshold

FB PIN OPEN

28

V

OTP threshold

120

135

150

°C

CURRENT LIMITING SECTION

Peak Current Limitation

FB PIN OPEN

0.85

1

V

DRIVER OUTPUT SECTION

Output Voltage Low State

2.5

V

Output Voltage High State

12.2

V

Output Voltage Rise Time

200

300

ns

Output Voltage Fall Time

50

90

ns