-

+

-

+

-

+

-

+

V1 Output

V1 Output

V1 Output

- S

ens

e

+ Se

nse

Current

Share

Current

Share

EMH350PSXX (1)

EMH350PSXX (2)

EMH350PSXX (3)

Load

EMH350

Signals & Controls

Single Outputs

AC OK/Power Fail

Signals Description & Compatibility

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)

Signal & Cover Options

Model

Functions

Cover Compatibility

Remote

Sense Fan Supply 5 V Standby

AC OK/Power

Fail

Inhibit V1 &

V Fan

Current Share Variable Speed

Fan Control

PMBus

Standard Top

Fan (-TF)

Variable Speed

Top Fan (-VF)

EMH250PSXX

EMH350PSXX

EMH350PSXX-01

EMH350PSXX-02

EMH350PSXX-50

EMH350PSXXD

EMH350PSXXD-01

EMH350PSXXD-50

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. 1.

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. 2.

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. 3.

Variable Speed Fan Control

When used in conjuction with -VF fan cover, varies the speed of the fan depending on temperature of the unit.

See longform datasheet for details.

external 3 wire TACHO fan and run time. Adjustment of the output voltage and current limit set point and identification of

the unit model number and serial number are also possible. See longform datasheet for full details.

Figure 1.

Figure 2.

Figure 3.