ACPL-782T-000E 데이터 시트보기 (PDF) - Avago Technologies

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ACPL-782T-000E

Automotive Isolation Amplifier with R2Coupler™ Isolation

Avago Technologies 

HV+

MOTOR

***

+-

RSENSE

POSITIVE

FLOATING

SUPPLY

GATE DRIVE

CIRCUIT

***

U1

78L05

IN OUT

C1

0.1

μF

R5

68

C2

1

0.1

μF

2

C3

0.01

μF

3

4

***

HV-

Figure 18. Recommended Application Circuit.

U2

ACPL-782T

C5

150 pF

+5 V

8

C4

0.1 μF

7

R1

2.00 K

6

R2

2.00 K

5

C6

150 pF

R3

10.0 K

+15 V

C8

0.1 μF

-

U3

+ MC34081

C7

R4

10.0 K

0.1 μF

-15 V

VOUT

PC Board Layout

The design of the printed circuit board (PCB) should follow

good layout practices, such as keeping bypass capacitors

close to the supply pins, keeping output signals away from

input signals, the use of ground and power planes, etc. In

addition, the layout of the PCB can also affect the isolation

transient immunity (CMTI) of the ACPL-782T, due primarily

to stray capacitive coupling between the input and the

output circuits. To obtain optimal CMTI performance, the

layout of the PC board should minimize any stray coupling

by maintaining the maximum possible distance between

the input and output sides of the circuit and ensuring that

any ground or power plane on the PC board does not pass

directly below or extend much wider than the body of the

ACPL-782T.

R5

C2 C4

C3

TO VDD1

TO RSENSE+

TO RSENSE-

Figure 19. Example Printed Circuit Board Layout.

TO VDD2

VOUT+

VOUT-

14

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