Our advanced series L28 DC input drivers are designed for HeNe lasers up to 15mW. These units include options to reduce current ripple and conducted emissions. They provide greater than 75% efficiency and typically do not require additional heat sinking.
L28110
The L28110 is a DC input power supply designed for low current ripple on the output. The optional active filter (option 38) typically reduces switching frequency and noise by an additional 50%. The unit has an input voltage of 22 to 30VDC and is available in four power ranges from 2.5 to 25W.
Specifications
AL*
AM*
AH*
AE*
Dimensions, W x L x H, in. [mm]
1.50 x 4.00 x 1.00 [38.10 x 101.60 x 25.40]
Input voltage (VDC)
22 - 30
22 - 30
22 - 30
22 - 30
Starting voltage (kV)**
>8
>10
>10
>10
Output power (W)
2.5 - 7
5 - 10
9 - 17
16 - 25
Output voltage (VDC)
900 - 1600
1300 - 2000
1700 - 3000
2500 - 3500
Output current (mA)
2.5 - 5
3.5 - 6
4.5 - 7
6 - 7.5
Output current ripple (%)
<1 P-P@ nominal voltage
<1 P-P@ nominal voltage
<1 P-P@ nominal voltage
<1 P-P@ nominal voltage
Efficiency (%)
>75
>75
>75
>75
Temperature (°C)
-20 to +50
-20 to +50
-20 to +50
-20 to +50
Approximate tube output (mW)
1
1 - 3
2 - 5
5 - 15
L28111
The L28111 is a DC input power supply that enables users to incorporate an active filter (option 38) as well as a filter on the input lines (option 37) to reduce conducted emissions from the switching section of the power supply. The L28111 features an input voltage of 22 to 30VAC and is available in four power ranges from 2.5 to 25W.
Specifications
AL*
AM*
AH*
AE*
Dimensions, W x L x H, in. [mm]
1.50 x 4.25 x 1.00 [38.10 x 107.95 x 25.40]
Input voltage (VDC)
22 - 30
22 - 30
22 - 30
22 - 30
Starting voltage (kV)**
>8
>10
>10
>10
Output power (W)
2.5 - 7
5 - 10
9 - 17
16 - 25
Output voltage (VDC)
900 - 1600
1300 - 2000
1700 - 3000
2500 - 3500
Output current (mA)
2.5 - 5
3.5 - 6
4.5 - 7
6 - 7.5
Output current ripple (%)
<1 P-P@ nominal voltage
<1 P-P@ nominal voltage
<1 P-P@ nominal voltage
<1 P-P@ nominal voltage
Efficiency (%)
>75
>75
>75
>75
Temperature (°C)
-20 to +50
-20 to +50
-20 to +50
-20 to +50
Approximate tube output (mW)
1
1 - 3
2 - 5
5 - 15
L28110 & L28111 typical installation
L28120
The L28120 features circuit board refinements that provide superior thermal management for the power supply and help to eliminate the effects of outside influences. The driver also employs an active filter (option 38), enabling users to reduce output noise with less than 0.5% P-P output current ripple. This reduction represents a decrease in switching frequency and noise of 90% over our standard line of power supplies. Users can also incorporate option 37 on the input lines to reduce noise caused by conducted emissions from the switching section of the power supply. Option 37 minimizes interference with other equipment on the same power supply bus.
The L28120 features an input voltage of 22 to 30VDC and is available in four power ranges from 2.5 to 25W.
Specifications
AL*
AM*
AH*
AE*
Dimensions, W x L x H, in. [mm]
3.30 x 4.25 x 1.20 [83.82 x 107.95 x 30.48]
Input voltage (VDC)
22 - 30
22 - 30
22 - 30
22 - 30
Starting voltage (kV)**
>10
>10
>10
>10
Output power (W)
2.5 - 7
5 - 10
9 - 17
16 - 25
Output voltage (VDC)
900 - 1600
1300 - 2000
1700 - 3000
2500 - 3500
Output current (mA)
2.5 - 5
3.5 - 6
4.5 - 7
6 - 7.5
Output current ripple (%)
<0.5 P-P@ nominal voltage
<0.5 P-P@ nominal voltage
<0.5 P-P@ nominal voltage
<0.5 P-P@ nominal voltage
Efficiency (%)
>75
>75
>75
>75
Temperature (°C)
-20 to +50
-20 to +50
-20 to +50
-20 to +50
Approximate tube output (mW)
1
1 - 3
2 - 5
5 - 15
*See below for a description of these power ranges.
**At nominal input voltage.
L28120 typical installation
Power Ranges For AC & DC Power Supplies
We offer AC and DC input power supplies in a variety of power ranges. The following labeling system is used to denote a particular power range.
Power ranges (DC input units)
Power ranges (AC input units)
L
low power
I
very low power
M
medium power
D
low power
H
high power
No letter
standard power
E
special high power unit with 39% more output power capability than an "H" power range unit
E
special high power unit with 39% more output power capability than a standard unit
Please note: To indicate that the high voltage return lead is at ground potential, an "A" should appear before each letter above. For example, "AH" tells us not only that the high voltage return lead is at ground, but that the power range is high. Ground can be either negative or positive.
