Sales Information

Phone:(425) 353-3010

Fax: (425) 353-4030

SVRFL2800D - 10.0

E-mail: vptsales@vptpower.com

Web: www.vptpower.com

Page 10

SVRFL2800D Series

6.2.4 Parallel Operation (SHARE)

The SVRFL2800D Series provides a SHARE function for active current sharing among paralleled modules. For the dual output model,

the SHARE function is only applicable in the single-ended output configuration (see section 6.1.4) where no current is drawn from the

OUTCOM pin. To enable load sharing, connect a single wire between the SHARE pins of all parallel modules. The SHARE pin can be

noise sensitive. Paralleled converters should be located physically close to one another and share a low impedance OUTCOM

connection. A symmetrical layout of the output traces will improve share accuracy. Frequency synchronization is not required for

parallel operation. The SHARE pin should be left open if not used.

6.3 PROTECTION FEATURES

6.3.1 Input Undervoltage Lockout

The SVRFL2800D Series provides input undervoltage lockout protection. For input voltages below the turn-on voltage, the converter

will remain off, drawing minimal current from the source. When the input voltage exceeds the turn-on voltage, the converter will start.

The lockout circuit is designed to tolerate slow ramping input voltage waveforms. VPT’s proprietary magnetic feedback technology

provides bias voltage to all secondary control circuits and control amplifiers before the output starts, ensuring a well-controlled start up

sequence.

2

INCOM

4

INH1

1

28VIN

7

+VOUT

8

OUTCOM

+

-

28Vdc

12

28VOUT

7

OUTCOM

1

28VIN

6

INCOM

CASE

-VOUT

9

SYNCIN

6

28VIN

2

28VIN

3

INCOM

4

INCOM

5

28VOUT

11

28VOUT

10

OUTCOM

9

OUTCOM

8

SVRME28 EMI FILTER

SVRFL2800D DC-DC CONVERTER

CASE

5

SYNCOUT

11

SHARE

2

INCOM

4

INH1

1

28VIN

7

+VOUT

8

OUTCOM

-VOUT

9

SYNCIN

6

SVRFL2800D DC-DC CONVERTER

CASE

5

SYNCOUT

11

SHARE

2

INCOM

4

INH1

1

28VIN

7

+VOUT

8

OUTCOM

-VOUT

9

SYNCIN

6

SVRFL2800D DC-DC CONVERTER

CASE

11

SHARE