U3848-S08-R datasheet(10/13 Pages) UTC

10 / 13 page

U3848/A/B/C

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

10 of 13

www.unisonic.com.tw

QW-R103-033,B

FUNCTIONAL DESCRIPTION(Cont.)

C13

UTC

U3848/A/B/C

IC3

VCC

15V

5.5V

Driver

C13

UTC

U3848 /A/B/C

R17

IC3

VCC

3.5V

FIG.8 OLP test circuit

FIG.9 OVP test circuit

VFB

7.2us

4.6v

Driver

7.2us

VCC

16v

VFB

(4) Driver Output Section

Rise edge time of driver output is about 200ns for avoiding Low EMI. When driver output VOL(MAX) is less than

2.5V with 200mA source current, and VOH(MIN) is more than 12.2V with 200mA sink current.

C13

UTC

U3848 A/B/C

R17

IC3

VCC

15v

Isink=200mA

VOH (MIN )

C13

UTC

U3848 /A/B/C

R17

IC3

VCC

15v

Isource=200mA

VOL (MIN)

FIG.10 driver test circuit with sink current

FIG.11 driver test circuit with source current

VFB

(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.

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