2

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Characteristic

Minimum

Typical

Maximum

Units

Notes & Conditions

Input Voltage - Operating

36

48

75

VDC

Can be configured as -48 VDC. See Fig. 11

Input Current - Full Load

5

7

A

Input Reverse Voltage Protection

Continuous protection with automatic recovery

Input Transient

ETSI EN300 132:2003 Compliant

Undervoltage Lockout Protection

32

35

VDC

Inrush Current

30

A

48 VDC input

Input Protection

15

A

Fast acting fuse

(2)

Output Characteristics

Characteristic

Minimum

Typical

Maximum

Units

Notes & Conditions

Output Voltage - V1

12

12

VDC

See Models and Ratings table

Initial Set Accuracy

V1:±1, V2:±5, V3:±3

%

48 VDC input at 50% load

Output Voltage Adjustment

%

Not fitted

Minimum Load

10

%

On V1 required to meet all specification

parameters on V2 & V3.

Start Up Delay

2

3

s

See Fig. 2

Hold-Up Time

4

ms

Drift

±0.2

%/şC

Line Regulation

V1:±0.5, V2:±5, V3:±3

%

Of nominal with input variation 36-75 VDC

Load Regulation

V1:±1, V2:±5, V3:±3

%

10-100% load of nominal input

Transient Response - V1

4

%

Recovery within 1% in less than 500 μs

for a 50-75-50% load step

Over/Undershoot - V1

1

%

Ripple & Noise

1

% pk-pk

20 MHz bandwidth See Fig. 3

Overvoltage Protection

115

140

%

Vnom DC output 1 only, recycle input to reset

Overload Protection

110

125

% I nom

Output 1 only auto restart. See Fig. 4

Short Circuit Protection

Continuous, trip & restart (hiccup) characteristic

Temperature Coefficient

0.02

%/˚C

After 20 mins warm up

Models and Ratings

Figure 1

Typical inrush current characteristics (30 A)

Input Voltage

Input Current

Input Characteristics

2. Fuse fitted in -ve input line. See Fig. 10 & 11.

Max Output Power

(10 CFM Air Flow)

Output Voltage

V1

Output Current

(10 CFM Airflow)

Fan Output

V2

Standby Supply

V3

Model

Number

212 W

12.0 VDC

16.7 A

12.0 V/1.0 A

5.0 V/0.1 A

DMA21248S12