U3848/A/B/C

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

10 of 13

www.unisonic.com.tw

QW-R103-033,B

FUNCTIONAL DESCRIPTION(Cont.)

C4

2

1

3

4

7

8

6

5

C3

C13

UTC

U3848/A/B/C

IC3

15V

5.5V

Driver

C4

2

1

3

4

7

8

6

5

C3

C13

UTC

U3848 /A/B/C

R17

RT

IC3

VCC

3.5V

FIG.8 OLP test circuit

FIG.9 OVP test circuit

7.2us

4.6v

V

FB

Driver

7.2us

16v

(4) Driver Output Section

C4

2

1

3

4

7

8

6

5

C3

C13

UTC

U3848 A/B/C

R17

RT

IC3

VCC

15v

Isink=200mA

C4

2

1

3

4

7

8

6

5

C3

C13

UTC

U3848 /A/B/C

R17

RT

IC3

VCC

15v

Isource=200mA

FIG.10 driver test circuit with sink current

FIG.11 driver test circuit with source current

V

FB

(5) External power switch MOS transistor

Because U3848/A/B/C driver output voltage Low level threshold is about 2.5V, User may apply power MOS

transistors with bigger threshold. 4N60 is recommended normally.