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ADDC02803SC

28 V/66 W/100 W DC/DC Converters with Integral EMI Filter

Analog Devices 

ADDC02803SC/ADDC02805SA

DISABLE

ENB VCC

+5V

C1

0.1␮F

GND OUT

HH73R-1MHz

CONNER/WINFIELD

C2

100pF

SYNC OUT

R1

100⍀

SYNC IN

SYNC IN

R3

357⍀

C3

0.1␮F

D1

1N966B

OLH5801

(ISOLINK) 5

2

R4

8 51⍀

C4

100pF R2

1k⍀

C5

100pF

3

6

R5

1k⍀

C13

100pF

R13

1k⍀

D4

1N5819

VAUX

SYNC 1

D3

1N5819

SYNC 2

D2

1N5819

SYNC 10

Figure 38. Fault Tolerant, Secondary Side Powered SYNC Drive Circuit

NOTES

1. Input to Output Isolation: With the use of the Isolink opto-

coupler, we can use the output of the converters to power the

Conner/Winfield 1 MHz clock (output referenced) and the

VAUX pin (input referenced) to power the opto-coupler.

2. Fault Tolerant: All outputs are capacitively coupled to ensure

that if the master clock stops working the individual units will

continue to operate at their own internal clock frequency,

thereby eliminating a potential single point failure.

3. Radiated Emissions: C2 can be added to slow down the clock

edges (Tr and Tf) for reducing radiated emissions.

4. Table: The following table shows the capacitor and resis-

tor value to be used for the number of converters to be

synchronized.

# of

Converters

1

2

3

4

5

6

7

8

9

10

Capacitor

Value (pF)

1000

470

330

270

220

180

150

120

100

100

Resistor

Value

(ohms)

100

200

300

400

500

600

700

800

900

1K

REV. A

–17–

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