Model

Functions

Remote

Sense

Fan Supply

5 V Standby

AC OK/

Power Fail

Inhibit V1 &

V Fan

Current Share

Variable Speed

Fan Control

PMBus

EMH350PDxx-U

Contact

Sales

EMH350PDxx-EF

EMH350

Signals & Controls

Dual Outputs

Characteristic

Notes & Conditions

Signals & Control

Remote Sense

Compensates for 0.5 V total voltage drop

12 V Fan Supply (V3)

12 V/0.6 A supply, present when AC supplied, inhibit turns fan supply off.

5V Standby

5 V/2 A supply, always present when AC supplied

AC OK/Power Fail

AC OK is an open collector transistor, referenced to negative sense, providing a minimum of 3 ms warning of loss of output

regulation. The transistor is normally off when AC is healthy. See fig. 4.

Inhibit

The inhibit high pin should be pulled below 0.4 V to switch V1 & V Fan (V3) off. Open circuit or 2-8 V maximum to switch

the output on. See fig. 5.

Current Share

Connecting pin 9 (-01 & -02 models) of like voltage units (3 maximum) will force the current to share between the outputs.

Units share current within 10% of each other at full load. See fig. 6.

Variable Speed Fan Control

Only available for -EF models. Varies the speed of the integral fans depending input voltage, output power & ambient tem-

perature within the unit.

-

+

-

+

-

+

-

+

V1 Output

V1 Output

V1 Output

- S

en

se

+ S

ens

e

Current

Share

Current

Share

-

+

-

+

-

+

V2 Output

V2 Output

V2 Output

EMH350PDXX (1)

EMH350DSXX (2)

EMH350PDXX (3)

EMH350PDXX (1)

EMH350DSXX (2)

EMH350PDXX (3)

Load

AC OK/Power Fail

Inhibit

Parallel Load & Current Share

AC OK Collector

Pin 11

AC OK Emitter

Pin 8 (-sense)

POWER SUPPLY

Transistor On (<0.8 V):

AC OK

Transistor Off (>4.5 V):

AC NOT OK

J2 Logic Connector

1 K

5 V Standby

Pin 3 or 4

Max 30 V 10 mA

Inhibit Hi

Pin 10

POWER SUPPLY

Signals Connector

Inhibit Lo

Pin 8 (-sense)

Figure 4.

Figure 5.

Figure 6.

Signals Description & Compatibility