U9751B

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

6 of 6

www.unisonic.com.tw

QW-R103-034,A

TYPICAL APPLICATION

Typical Application

R14

Q4

Q3

R19

C14

R17

1k

M2

9435

C13

100uF

L3 20uH

D2

SCD24

R23

1.21k 1%

R22

2k 1%

R24

C16

220uF/16 V

Vout 2

Vout1

C10

220 uF/16V

Q2

Q1

R18

C8

R16

1k

M1

9435

C17

100uF

L2 20uH

D1

SCD24

R21

3.3k 1%

R20

10k 1% R25

R15

1k

C9

C15

R13

1k

R12

R11

33k

CT

REF

RT

SCP

EAINV1

EAINV2

EAOUT1

EAOUT 2

FB1

FB2

DTC1

DTC2

OUT1

OUT2

GND

VCC

IC1

R10 33k

C7 0.027uF

R9 33k

C20.33uF

R7

10k

R6

10k

C12

C11

R8

R5

UTC U9751B

R3

33k

C6

0.027uF

C4

R2

33k

C3

100uF

R1

33k

C1 330pF

R4 10k

Vin

C5

TIMING WAVEFORM

H

L

1.3V

0V

SCP Enabel Output

SCP Waveform

Output Waveform

(H shutdown)

Error Amplifier Output

CT Waveform

H

L

Timing Diagram

UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or

other parameters) listed in products specifications of any and all UTC products described or contained

herein. UTC products are not designed for use in life support appliances, devices or systems where

malfunction of these products can be reasonably expected to result in personal injury. Reproduction in

whole or in part is prohibited without the prior written consent of the copyright owner. The information

presented in this document does not form part of any quotation or contract, is believed to be accurate

and reliable and may be changed without notice.