UC3848

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

4 of 11

www.unisonic.com.tw

QW-R103-033.F

PARAMETER

SYMBOL

RATINGS

UNIT

Supply Voltage

30

V

30

V

Input Voltage to FB Pin

-0.3 ~ 6.2

V

Input Voltage to CS Pin

-0.3 ~ 2.8

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.

RECOMMENDED OPERATING CONDITIONS

PARAMETER

SYMBOL

RATINGS

UNIT

Supply Voltage

8.2 ~ 22

V

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY SECTION

Start Up Current

22

45

μA

OFF

7

9

mA

Supply Current with switch

ON

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 Enter FB Voltage

1.5

V

Reduce-Frequency end FB Voltage

1.6

V

Burst-Mode Out FB Voltage

1.7

V

Normal

61

68

75

kHz

Switch Frequency

Power-Saving

Before enter burst mode

20

40

kHz

68

74

80

%

Duty Cycle

0

%

Feedback Resistor

16

21

26

k

Ω

Soft-Start Time

9.9

11.2

12.6

ms

PROTECTION SECTION

19

V

OVP threshold

28

OLP threshold

4.7

4.9

5.1

V

Delay Time Of OLP

55

62

70

mS

OTP threshold

120

135

150

°C

OVP Disable threshold

3.9

4.1

4.3

V

OLP Enable threshold

5.1

5.4

5.7

V

CURRENT LIMITING SECTION

LEB

220

ns

Peak Current Limitation

0.86

1

V

0.77

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