ACDC
Specification
250/350 Watts
•Single & Dual Output Models
•IT & Medical (BF) Approvals
•80 V 275 VAC Operation
•Optional ORing Diode (EMH350D Models)
•Analog & PMBus Signals Options (EMH350)
•5 V Standby (EMH350)
•3 Year Warranty
EMH Series
Input
Input Voltage • 80-275 VAC, derate output power
<90 VAC (see derating curve)
Input Frequency • 47-63 Hz
Input Current • 2.6 / 3.6 A at 115 VAC typical (250 / 350 W)
1.3 / 1.8 A at 230 VAC typical (250 / 350 W)
Inrush Current • 40 A max at 230 VAC, cold start 25 °C
Power Factor • >0.9
Earth Leakage Current • 250 µA max, 264 VAC, 60 Hz
Patient Leakage Current • 100 µA max
Input Protection • 10 AF / 250 V internal fuse in line
and neutral
Output
Output Voltage • 12-48 VDC (see tables)
Output Voltage Trim • ±10% V1
Initial Set Accuracy • ±1% V1, ±5% V2
Minimum Load • No minimum load required
Start Up Delay • 1 s typical
Start Up Rise Time • 50 ms
Hold Up Time • 16 ms typical
Line Regulation • ±0.5% maximum
Load Regulation • ±1% V1, ±5% standby
Cross Regulation • Dual output only (see regulation curves)
Transient Response • 4% max. deviation, recovery to
within 1% in 500 µs for a 50-75-50%
load change
Ripple & Noise • 1% pk-pk, 20 MHz bandwidth
Overvoltage Protection • 115-140% V1 nom, recycle input to reset
Overtemperature • Auto reset
Protection
Overload Protection • 110-150%, power limit
Short Circuit Protection • Continuous, approximately constant
current
Temperature • 0.05% /°C
Coefficient
Remote Sense • Compensates for up to 0.5 V drop
xppower.com
General
Efficiency • 87% typical
Isolation • 4000 VAC input to output 2 x MOPP,
1500 VAC input to ground 1 x MOPP,
1500 VAC output to ground 1 x MOPP
Switching Frequency • 62-560 /71 /50-130 KHz,
PFC /Main /Standby Converter
Power Density • 11.6/ 16.3/ 9.5 W/in3(250 / 350 / 350 W Dual)
Signals (Option EMH350) • Power fail, Inhibit, 5 V Standby,
Current Share, fan speed control and I2C
PMBus Options
MTBF • 400 kHrs to MIL-HDBK-217F at 25 °C, GB
Environmental
Operating Temperature • 0 °C to +70 °C, derate linearly from +50 °C
at 2.5% / °C to 50% load at +70 °C
Cooling • Forced cooled 12 CFM (350 W Dual: 16 CFM)
or integral fan. See thermal considerations
longform datasheet
Operating Humidity • 95% RH, non-condensing
Storage Temperature • -40 °C to +85 °C
Operating Altitude • 3048 m
Shock • ±3 x 30g shocks in each plane, total 18
shocks. 30g = 11 ms (±0.5 ms), half sine,
conforms to EN60068-2-27 & EN60068-2-47
Vibration • Single axis 10 - 500 Hz at 2g sweep and
endurance at resonance in all 3 planes.
Conforms to EN60068-2-6
EMC & Safety
Emissions • EN55011/22 level B conducted
EN55011/22 level A radiated
(See EMC report)
Harmonic Currents • EN61000-3-2, class A
Voltage Flicker • EN61000-3-3
Radiated Immunity • EN61000-4-3, level 3 Perf Criteria A
EFT/Burst • EN61000-4-4, level 3 Perf Criteria A
Surge • EN61000-4-5, installation class 3,
Perf Criteria A
Conducted Immunity • EN61000-4-6, level 3, Perf Criteria A
Dips & Interruptions • EN61000-4-11, 30% 10 ms,
60% 100 ms, 100% 5000 ms,
Perf Criteria A, B, B,
EN60601-1-2, 30% 500 ms, 60% 100 ms,
100% 10 ms, 100% 5000 ms, Perf Criteria A,
A, A, B - 230 VAC. Consult longform
datasheet for 115 V operation.
Safety Approvals • EN60601-1, ANSI/AAMI ES60601-1,
CSA22.2 No.60601-1 per cUL BF Rated,
Including Risk Management, EN60950,
UL60950
ACDC
EMH250
Mechanical Details
Models and Ratings Single Outputs
Notes
Notes
1. Dimensions shown in inches (mm).
Tolerance: ±0.02 (±0.5)
2. Weight: 0.90 lb (410 g).
4.55 (115.6)
2.55
(64.8)
0.22 (5.7)
M3 mounting holes in 4 positions
0.22
(5.7)
1.43
(36.3)
5.0 (127.0)
C5
T1
D5
C3
3.0
(76.2)
L
N
E
0.73
(18.6)
Input Terminal
Block Center Line
Input Terminal
Block CON 1
(pin 1) L
N
E
0.65
(16.7)
0.90
(23.0)
0.35
(9.1)
Output Connector
Center Line
Output Connector
Center Line
Signals Connector*
Output Adjust
Output Terminals
M4 Pan HD screw
in 2 positions
Torque to 8 lbs-in
(90 cNm) max
-V1 Con 3
+V1 Con 2
Recommended
Airflow
Direction
Signals Connector 10 way 2 mm pitch p/n JST BI0B-PHDSS
Mating Half - p/n JST PHDR-10VS,
Contact- 26-22 AWG p/n JST SPHD-001T-P0.5
*Signals Connector
TOP VIEW
(pin 2) N/C N/C (pin 1)
N/C N/C
Fan -VE Fan +VE
-VE Sense + VE Sense
(pin 10) N/C N/C (pin 9)
Output Voltage V1 Output Current V1 Fan Supply V3 Output Power Model Number(1)
12 V 21.0 A 12 V/0.6 A 252 W EMH250PS12
18 V 14.0 A 12 V/0.6 A 252 W EMH250PS18
24 V 10.5 A 12 V/0.6 A 252 W EMH250PS24
48 V 5.2 A 12 V/0.6 A 250 W EMH250PS48
Input Connector CON 1
TYCO part # 640445-5
Pin 1 Line
Pin 2 Neutral
Pin 3 Earth
Output Connector
Con 2 +V1
Con 3 -V1
1. The EMH250 is available with a top mounted fan cover option. Add suffix ‘-TF’ to model number e.g. EMH250PS12-TF. See mechanical drawing later in this
datasheet.
Mates with Tyco MTA-156 & SL-156
Product Lines
EMH250PSXX
Derating Curve All EMH250 & EMH350 Models
40
50
80
60
70
90
100
80 90
85 275
Input Voltage (VAC)
Output Power (%)
EMH350
Mechanical Details
Models and Ratings Single Outputs
Notes
Output Voltage V1 Output Current V1 Standby Supply Fan Supply V3 Output Power Model Number(1)
12 V 29.2 A 5.0 V / 2.0 A 12 V/0.6 A 354 W EMH350PS12
18 V 19.5 A 5.0 V / 2.0 A 12 V/0.6 A 354 W EMH350PS18
24 V 14.6 A 5.0 V / 2.0 A 12 V/0.6 A 355 W EMH350PS24
48 V 7.3 A 5.0 V / 2.0 A 12 V/0.6 A 354 W EMH350PS48
ACDC
5.0 (127.0)
3.0
(76.2)
4.55 (115.6)
2.55
(64.8)
0.22 (5.7)
M3 mounting holes in 4 positions
0.22
(5.7)
1.43
(36.3)
L
N
E
0.73
(18.6)
Input Terminal
Block Center Line
Input Terminal Block
CON 1
0.65
(16.7)
0.90
(23.0)
0.35
(9.1)
Output Connector
Center Line
Output Connector
Center Line
Signals Connector*
Output Adjust
Output Terminals
M4 Pan HD screws
in 2 positions
Torque to 8 lbs-in
(90 cNm) max
Recommended
Airflow
Direction
Signals Connector 10 way 2 mm
pitch p/n JST BI0B-PHDSS
Mating Half - p/n JST PHDR-10VS,
Contact- 26-22 AWG p/n
JST SPHD-001T-P0.5
*Signals Connector Top View
(pin 2) +VE Standby +VE Standby (pin 1)
-VE Standby -VE Standby
Fan -VE Fan +VE
-VE Sense + VE Sense
(pin 10) N/C N/C (pin 9)
(pin 1) L
N
E
-V1 Con 3
+V1 Con 2
C3
C5
T1
D5
Input Terminal Block
CON 1
5.0 (127.0)
0.73
(18.6)
3.0
(76.2)
0.65
(16.7)
0.90
(23.0)
Output Connector
Center Line
Output Connector Center Line
0.35 (9.1)
Signals Connector*
Pin 1
Voltage Adjust
Output Terminals
M4 Pan HD screws
in 2 positions
Torque to 8 lbs-in
(90 cNm) max
1.43
(36.3)
2.55
(64.8)
0.22 (5.7)
M3 mounting holes in 4 positions
4.55 (115.6)0.22
(5.7)
Input Terminal
Block Center Line
Recommended
Airflow
Direction
(pin 1) L
N
E
-V1 Con 3
+V1 Con 2
EMH350
EMH350 (Signal Options)
Notes
1. Dimensions shown in inches (mm). Tolerance: ±0.02 (±0.5) 2. Weight: 0.9 lb (410 g).
Input Connector CON 1
TYCO part # 640445-5
1 Line
2 Neutral
3 Earth
EMH350PSXX-01 & EMH350PSXX-02
1 -VE Standby 2 -VE Standby
3 +VE Standby 4 +VE Standby
5 +VE Fan Supply 6 -VE Fan Supply
7 +VE Sense 8 -VE Sense
9 Current Share 10 Inhibit
11 Power Fail 12 N/C
EMH350PSXX-50
1 -VE Standby 2 -VE Standby
3 +VE Standby 4 +VE Standby
5 +VE Fan Supply 6 -VE Fan Supply
7 +VE Sense 8 -VE Sense
9 Fan Tacho Input 10 I2C GND
11 I2C Data 12 I2C Clock
Output Connector
CON 2 +V1
CON 3 -V1
Signals Connector 12 way 2 mm
pitch p/n JST S12B-PHDSS
Mating Half - p/n JST PHDR-12VS,
Contact- 26-22 AWG p/n
JST SPHD-001T-P0.5
Pin 10
Pin 2
Pin 4
Pin 6
Pin 8
Pin 12
Pin 9
Pin 11
Pin 1
Pin 3
Pin 5
Pin 7
1. The EMH350 is available with various analog, digital signal and cover options. See compatibility table and mechanical drawing later in this datasheet.
Mates with Tyco MTA-156
& SL-156 Product Lines
Output Voltage V1 Output Current V1 Standby Supply Fan Supply V3 Output Power Model Number(1)
12 V 29.2 A 5.0 V / 2.0 A 12 V/0.6 A 354 W EMH350PS12D
18 V 19.5 A 5.0 V / 2.0 A 12 V/0.6 A 354 W EMH350PS18D
24 V 14.6 A 5.0 V / 2.0 A 12 V/0.6 A 355 W EMH350PS24D
48 V 7.3 A 5.0 V / 2.0 A 12 V/0.6 A 354 W EMH350PS48D
ACDC
EMH350D
Mechanical Details
EMH350D
EMH350D (Signal Options)
Models and Ratings Single Outputs
Notes
0.97
(24.7)
0.22 (5.7)
5.75 ±0.02 (146.0 ±0.5)
3.00 ±0.02
(76.2 ±0.5)
Input Terminal Block
CON 1
4.55 (115.6)
2.55
(64.8)
M3 mounting holes in 4 positions
1.43 ±0.02
(36.3 ±0.5)
0.91
(23.1)
0.72
(18.3)
0.35 (9.1)
Output Connector
Center Lines
Output Connector
Center Lines
Output Adj.
Signals Connector*
Output Terminals
M4 Screw in 2 positions
Torque to 8 lbs-in
(90 cNm) max.
0.73
(18.6)
Input Terminal Block,
Center Line
Recommended
Airflow
Direction
Signals Connector 10 way 2 mm
pitch part number JST B10B-PHDSS,
Mating half part number JST PHDR-10VS,
Contact 26-22 AWG part number
JST SPHD-001T-P0.5
*Signals Connector Top View
(pin 2) +VE Standby +VE Standby (pin 1)
-VE Standby -VE Standby
Fan -VE Fan +VE
-VE Sense + VE Sense
(pin 10) N/C N/C (pin 9)
(pin 1) L
N
E
-V1 Con 3
+V1 Con 2
C5
T1
D5
1.43 ±0.02 (36.3 ±0.5)
*Signal Connector
Pin 1
0.91
(23.1)
0.72
(18.3)
0.35 (9.1)
Output Connector
Center Lines
Output Connector
Center Lines
Output Adj.
Output Terminals
M4 Screw in 2 positions
Torque to 8 lbs-in
(90 cNm) max.
0.97
(24.7)
0.22 (5.7)
5.75 ±0.02 (146.0 ±0.5)
3.00 ±0.02
(76.2 ±0.5)
4.55 (115.6)
M3 mounting holes in 4 positions
Input Terminal Block
2.55
(64.8)
0.73
(18.6)
Input Terminal Block,
Center Line
Recommended
Airflow
Direction
Recommended
Airflow
Direction
(pin 1) L
N
E
-V1 Con 3
+V1 Con 2
Notes
1. Dimensions shown in inches (mm). Tolerance: ±0.02 (±0.5) 2. Weight: 1.0 lbs (450 g).
1. The EMH350D models are fitted with an integral ORing diode and are also available with various analog and digital signal options. See compatibility table and
mechanical drawing later in this datasheet.
Input Connector CON 1
TYCO part # 640445-5
1 Line
2 Neutral
3 Earth
Output Connector
CON 2 +V1
CON 3 -V1
Mates with Tyco MTA-156
& SL-156 Product Lines
EMH350PSXXD-01
1 -VE Standby 2 -VE Standby
3 +VE Standby 4 +VE Standby
5 +VE Fan Supply 6 -VE Fan Supply
7 +VE Sense 8 -VE Sense
9 Current Share 10 Inhibit
11 Power Fail 12 N/C
EMH350PSXXD-50
1 -VE Standby 2 -VE Standby
3 +VE Standby 4 +VE Standby
5 +VE Fan Supply 6 -VE Fan Supply
7 +VE Sense 8 -VE Sense
9 Fan Tacho Input 10 I2C GND
11 I2C Data 12 I2C Clock
-+
-+-+-+
V1 Output V1 Output V1 Output
-Sense
-Sense
+Sense
+Sense
-Sense
+Sense
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DC
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.
I2C/PMBus
The I2C PMBus compatible interface can be used for monitoring the unit output voltage, current, internal temperature,
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.
Signals Connector 10 way 2 mm pitch
part number JST B10B-PHDSS
Mating half part number JST PHDR-10VS
Contact 26-22 AWG part number JST SPHD-001T-P0.5
Signals Connector
(pin 9) N/C N/C (pin 10)
(pin 2) +VE
-VE
Fan -VE
-VE Sense
+VE (pin 1)
-VE
Fan +VE
+VE Sense
ACDC
EMH250/350
Top Fan EMH250TF & EMH350TF
Top Fan with Signals Options EMH35001TF, EMH35050TF & EMH35002VF
Mechanical Details Single Outputs
5.00 ±0.02 (127.0 ±0.5)
Input Terminal
Block, Center Line
1.01
(25.6)
3.56 ±0.02
(90.4 ±0.5)
M3 mounting holes in 4 positions
Max. penetration by screw to be 0.157 (4.0)
from outside face of chassis
1.96
(50.0)
0.76
(20.2)
0.75
(19.1) 3.50 (88.9)
Input Terminal Block
CON 1
M3 mounting holes in 2 positions
Max. penetration by screw to be 0.157 (4.0) from outside face of chassis
2.78 ±0.02
(70.5 ±0.5)
3.50 (88.9)
0.75
(19.1)
0.97
(24.8)
0.79
(19.9)
1.84
(46.8)
1.19
(30.1)
Signals Connector*
Output Terminals
M4 Screw in 2
positions
Torque to
8 lbs-in
(90 cNm) max.
(pin 1) L
N
E
-V1 Con 3
+V1 Con 2
M3 mounting holes in 4
positions. Max. penetration
by screw to be 0.157 (4.0)
from outside face of chassis 1.96
(50.0)
0.76
(20.2)
0.75
(19.1) 3.50 (88.9)
M3 mounting holes in 2 positions
Max. penetration by s crew to be 0.157 (4.0) from outside face of chassis
2.78 ±0.02
(70.5 ±0.5)
3.50 (88.9)
0.75
(19.1)
0.97
(24.8)
5.00 ±0.02 (127.0 ±0.5)
Input Terminal
Block, Center Line
Input Terminal Block
CON 1
1.01
(25.6)
3.56 ±0.02
(90.4 ±0.5)
0.79
(19.9)
1.84
(46.8)
1.19
(30.1)
Signals Connector*
Pin 1
Output Terminals
M4 Screw in 2
positions
Torque to
8 lbs-in
(90 cNm) max.
(pin 1) L
N
E
-V1 Con 3
+V1 Con 2
Notes
1. Dimensions shown in inches (mm). Tolerance: ±0.02 (±0.5) 2. Weight: 1.67 lbs (760 g).
Signals Connector 12 way 2 mm
pitch p/n JST S12B-PHDSS
Mating Half - p/n JST PHDR-12VS,
Contact- 26-22 AWG p/n
JST SPHD-001T-P0.5
Pin 10
Pin 2
Pin 4
Pin 6
Pin 8
Pin 12
Pin 9
Pin 11
Pin 1
Pin 3
Pin 5
Pin 7
Input Connector CON 1
TYCO part # 640445-5
1 Line
2 Neutral
3 Earth
Output Connector
CON 2 +V1
CON 3 -V1
Mates with Tyco MTA-156
& SL-156 Product Lines
EMH350PSXX-01TF &
EMH350PSXX-02VF
1 -VE Standby 2 -VE Standby
3 +VE Standby 4 +VE Standby
5 +VE Fan Supply 6 -VE Fan Supply
7 +VE Sense 8 -VE Sense
9 Current Share 10 Inhibit
11 Power Fail 12 N/C
EMH350PSXX-50TF
1 -VE Standby 2 -VE Standby
3 +VE Standby 4 +VE Standby
5 +VE Fan Supply 6 -VE Fan Supply
7 +VE Sense 8 -VE Sense
9 Fan Tacho Input 10 I2C GND
11 I2C Data 12 I2C Clock
Recommended
Airflow
Direction
Input Terminal Block - Dinkle Products DT-2C-A02W-03
Output Terminals
M4 PAN HD screws in 4 positions
Torque to 8 lbs-in (90 cNm) max.
-V1
+V1
Input Terminal Block
Center Line
Output Connector
Center Line
+V2
-V2
2.00
(50.8)
4.00
(101.6)
2.58
(65.4)
1.31
(33.1)
1.96
(49.8)
0.69
(17.4)
0.63
(16.1)
7.00 (177.8)
1.75
(44.5)
1.18
(29.9) 0.88
(22.2)
0.57
(14.4)
7.59 (192.8)
2.00
(50.8)
N
0.71
17.93
4.00
(101.6)
2.57
(65.4)
1.96
(49.8)
0.69
(17.4)
C3
0.63
(16.1)
1.57
(39.8)
0.75
(19.1)
1.30
(33.1)
L
E
-V1
+V1
-V2
+V2
Output Terminals
M4 PAN HD screws in 4 positions
Torque to 8 lbs-in (90 cNm) max.
Output Connector
Center Line
Input Terminal Block
Center Line
Input Terminal Block
TYCO p/n 640445-5
M3 Mounting holes in 2 positions each side
Max penetration by screw:
3.5 mm from outside face of chassis
6.00 (152.4)
4.00 (101.6)1.73 (44.0)
Airflow
Direction
C5
T1
D5
16 CFM
EMH350
Mechanical Details
Models and Ratings Dual Outputs
Notes
Output Voltage V1 Output Current V1 Output Voltage V2 Output Current V2 Standby Supply Fan Supply V3 Output Power Model Number(1)
12 V 16.5 A 24 V 8.3 A 5.0 V/2.0 A 12 V/0.6 A 354 W EMH350PD21-U
12 V 16.5 A 36 V 5.5 A 5.0 V/2.0 A 12 V/0.6 A 354 W EMH350PD22-U
12 V 16.5 A 48 V 4.2 A 5.0 V/2.0 A 12 V/0.6 A 355 W EMH350PD23-U
24 V 8.3 A 48 V 4.2 A 5.0 V/2.0 A 12 V/0.6 A 354 W EMH350PD24-U
60 V 3.3 A 60 V 3.3 A 5.0 V/2.0 A 12 V/0.6 A 354 W EMH350PD25-U
ACDC
EMH350PDxxU
Notes
1. Dimensions shown in inches (mm). Tolerance: ±0.02 (±0.5) 2. Weight: 0.9 lb (410 g).
1. For integral end fan version, replace ‘-U’ in model number with ‘- EF’ 2. Output voltages to 120 VDC possible with series output connection contact
sales.
EMH350PDxxEF
Pin Connections
Pin Function Pin Function
1 -VE Standby 7 +VE Sense
2 -VE Standby 8 -VE Sense
3 +VE Standby 9 Current Share
4 +VE Standby 10 Inhibit
5 Fan +VE 11 Power Fail
6 Fan -VE 12 Not Connected
Signals Connector - 12 WAY 2mm PITCH p/n JST S12B-PHDSS
Mating HALF - p/n JST PHDR-12VS
Contact - 26-22 AWG p/n JST SPHD-001T-P0.5
Pin 1 Pin 2
Pin 3 Pin 4
Pin 5 Pin 6
Pin 11 Pin 12
Pin 9 Pin 10
Pin 7 Pin 8
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
ACDC
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
-Sense
-Sense
+Sense
+Sense
-Sense
+Sense
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
5V 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
EMH350
ACDC
06-Feb-14
20.5
21
21.5
22
22.5
23
23.5
24
24.5
25
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
2
3
4
5
6
7
8
9
10
16.5
V2 Output Voltage
V1 Load (A)
V2 Cross Regulation
V2 4.15A (50%) Load
V2 8.3A (100%) Load
22.5
23
23.5
24
24.5
25
25.5
26
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
2
3
4
5
6
7
8
8.3
V2 Output Voltage
V2 Load (A)
V2 Load Regulation
V1 8.25A (50%) Load
V1 16.5A (100%) Load
Regulation Curves
EMH350PD21
EMH350PD22
V2 2.75A (50%) Load
V2 5.5A (100%) Load
31
32
33
34
35
36
37
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
2
3
4
5
6
7
8
9
10
16.5
V2 Output Voltage
V2 Cross Regulation
V1 Load (A) V2 Load (A)
0
5
10
15
20
25
30
35
40
45
50
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 123455.5
V2 Output Voltage
V2 Load Regulation
V1 8.25A (50%) Load
V1 16.5A (100%) Load
EMH350PD23
40
41
42
43
44
45
46
47
48
49
50
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
2
3
4
5
6
7
8
9
10
16.5
V2 Output Voltage
V1 Load (A)
V2 Cross Regulation
V2 2.1A (50%) Load
V2 4.2A (100%) Load
V2 Load (A)
44
46
48
50
52
54
56
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
2
3
4
4.2
V2 Output Voltage
V2 Load Regulation
V1 8.25A (50%) Load
V1 16.5A (100%) Load
EMH350PD24
45
45.5
46
46.5
47
47.5
48
48.5
49
49.5
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
2
3
4
5
6
7
8
8.3
V2 Output Voltage
V1 Load
V2 Cross Regualtion
V2 2.1A (50%) Load
V2 4.2A (100%) Load
44
46
48
50
52
54
56
58
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
2
3
4
4.2
V2 Output Voltage
V2 Load (A)
V2 Load Regulation
V1 4.15A (50%) Load
V1 8.3A (100%) Load