Remote programming in series operation for increased output voltage:

1. Programming by external voltage:

The analog programming circuits of this power su- ply are referenced to the negative output potential. Therefore, the circuits used to control each series connected unit must be separated and floated from each other.

2.Using the SO function and PS_OK signal:

The Shut-Off and PS_OK circuits are referenced to

 

the isolated interface common, IF_COM (J1-2,3).

 

The IF_COM terminals of different units can be

 

connected to obtain a single control circuit for the

 

power supplies connected in series.

3. Programming by external resistor:

Programming by external resistor is possible. Refer

 

to Section 6-5 for details.

4. Programming via the Serial

The communication port is referenced to the

 

IF_COM which is isolated from the power supply

 

output potential. Therefore power supplies con-

 

nected in series can be daisy-chained using the

 

Remote-In and Remote-Out connectors. Refer to

 

Chapter 7 for details.

5.14.2 Series connection for positive and negative output voltage

In this mode, two units are configured as a positive and negative output. Set the Output Current limit of each power supply to the maximum that the load can handle without damage. It is rec- ommended that diodes be connected in parallel with each unit output to prevent reverse voltage during start-up or in case one of the units shuts down. Each diode should be rated to at least the power supply rated output voltage and output current. Refer to Fig.5-3 for this operating mode.

+LS +S

POWER + SUPPLY -

-LS -S

+LS +S

POWER + SUPPLY -

-LS -S

(*)

(*)

+

-

(*) Diodes are user supplied.

Fig.5-3: Series connection for positive/negative output voltages

40

83-507-5002 Rev. B

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TDK 750W HALF RACK technical manual Series connection for positive and negative output voltage