ADDC02803SC/ADDC02805SA

REV. A

–17–

SYNC IN

SYNC IN

5

8

6

3

2

R3

357

OLH5801

(ISOLINK)

R4

51

C3

0.1 F

D1

1N966B

C4

100pF

C5

100pF

R2

1k

D4

1N5819

R5

1k

D3

1N5819

C13

100pF

D2

1N5819

R13

1k

SYNC 1

SYNC 2

SYNC 10

ENB

GND

OUT

HH73R-1MHz

CONNER/WINFIELD

C2

100pF

SYNC OUT

+5V

C1

0.1 F

DISABLE

R1

100

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

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.

Resistor

# of

Capacitor

Value

Converters

Value (pF)

(ohms)

1

1000

100

2

470

200

3

330

300

4

270

400

5

220

500

6

180

600

7

150

700

8

120

800

9

100

900

10

100

1K