240 – 300 Watt AC-DC and DC-DC Converters
The LR Series of AC-DC converters represents versatile power
supplies ideally suitable for use in advanced electronic systems.
Features include full power factor correction, good hold-up time,
high efficiency and reliability, low output noise, and excellent
dynamic response to load/line changes.
The converter inputs are protected against surges and transients.
An input over- and undervoltage lockout circuitry disables the
outputs if the input voltage is outside of the specified range. Input
inrush current limitation is included to prevent circuit breakers
and fuses from tripping at switch-on.
The outputs are open- and short-circuit proof.
Full input-to-output, input-to-case, output-to-case, and output to
output isolation is provided. Particularly the outputs exhibit an
extended insulation to the case.
LR Series
111
4.4"
3U
60
2.4"
12 TE
168
6.6"
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Class I equipment
Universal AC input voltage range with PFC and DC input
Inrush current limitation
2 isolated, adjustable outputs
No load, overload, and short-circuit proof
Rectangular current limiting characteristic with flexible
load distribution
Inhibit function
Parallel operation with active current sharing
Interruption time 20 ms
Immunity according to EN 61000-4-2, -3, -4, -5, -6, -8
RoHS-compliant
Fire & smoke according to EN 45545
All PCB boards protected by lacquer
Very high reliability
5 year warranty
AREMA compliant
Safety-approved to the latest edition of IEC/EN 62368-1
and UL/CSA 62368-1
1
1
80
3.2"
16
60
TE
2.4"
12 TE
168
6.6"
168
6.6"
111
4.4"
3U
111
4.4"
3U
111
4.4"
3U
80
3.2"
16 TE
168
6.6"
1
for AC input only
Table of Contents
Description........................................................................................1
Model Selection
................................................................................2
Functional Description ......................................................................3
Electrical Input Data
.........................................................................4
Electrical Output Data.......................................................................5
Auxiliary Functions
...........................................................................9
Electromagnetic Compatibility (EMC)
.............................................12
Immunity to Environmental Conditions
...........................................14
Mechanical Data
.............................................................................16
Safety and Installation Instructions
.................................................19
Description of Options
....................................................................20
Accessories ....................................................................................21
belfuse.com/power-solutions
BCD.00580 Rev AE, 27-Jun-2019
LR Series
Description
240 – 300 Watt AC-DC and DC-DC Converters
All PCB boards are coated with a protective lacquer.
The case design allows for operation at nominal load up to 71 °C with natural cooling. If forced cooling is provided, the ambient
temperature may exceed 71 °C, but the case temperature must remain below 95 °C.
A temperature sensor generates an inhibit signal, which disables the outputs when the case temperature
T
C
exceeds the limit. The
outputs are automatically re-enabled when the temperature drops below the limit.
LED indicators display the status of the converter and allow for visual monitoring of the system at any time.
The converters can either be plugged into a 19 ” rack system according to IEC 60297-3, or be chassis mounted. Two heat sinks of
different size and cooling plates for chassis mounting (option B, B1) are available.
Model Selection
Table 1: Model selection
Output 1
V
o nom
[V]
12
12
15
15
1
2
Output 2
V
o nom
[V]
12
12
15
15
I
o nom
[A]
10
12.5
8
10
Power
P
o nom
[W]
240
300
240
300
Operating Input Voltage
V
i cont
90 – 264 VAC
125 – 300 VDC
η
110 1
min [%]
90
90
90
90
Efficiency
η
230 2
min [%]
90
90
90
90
typ [%]
92
92
92
92
91
91
91
91
typ [%]
Model
Options
I
o nom
[A]
10
12.5
8
10
LR2320-9
LRP2320-9
LR2540-9
LRP2540-9
F0, F2,
B, B1
Efficiency at
T
A
= 25 °C,
V
i
= 110 VAC,
I
o nom
,
V
o nom
Efficiency at
T
A
= 25 °C,
V
i
= 230 VAC,
I
o nom
,
V
o nom
Part Number Description
LR 2 3 20 -9 B1
Operating input voltage
V
i cont
(continuously):
90 – 264 VAC, 125 – 300 VDC
........................ LR, LRP
Number of outputs ................................................................2
Nominal voltage of main output
V
o1 nom
12 V
.............................................................................3
15 V
.............................................................................5
Other voltages
1
......................................................1
- 9
12 V
.............................................................................20
15 V
.............................................................................40
Other specifications or additional features
1
.......
11 –
99
T
A
= – 40 to 71 °C,
T
C
≤
95 °C
......................................-9
Other
1
...............................................................
-0, -5, -6
Fuse options .........................................................
F0, F2
Cooling plate standard case ...................................B,
B1
1
2
Nominal voltage of tracking output
V
o2 2
Operational temperature range:
T
A
:
Auxiliary functions and options:
Customer-specific models. No safety-relevant changes compared to the respective basic model, e.g. different mechanical details, special
markings, mounted front plates, reduced output voltage, etc.
The nominal voltages of both outputs are always equal.
Note:
The sequence of options must follow the order above.
Example:
LR2320-9B1: AC-DC converter, operating input voltage range 90 to 264 VAC, 2 isolated outputs, each providing 12 V,
10 A, cooling plate B1, RoHS-compliant for all six substances.
Product Marking
Basic type designation: applicable approval marks, CE mark, warnings, pin designation, patents and company logo, identification of LEDs.
Specific type designation: input voltage range, nominal output voltages and currents, degree of protection, batch no., serial no., and
data code including production site, modification status, and date of production.
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Page 2 of 22
LR Series
240 – 300 Watt AC-DC and DC-DC Converters
Functional Description
The input voltage is fed via an efficient filter and a bridge rectifier to the PFC-corrected step-up converter, which generates the
intermediate voltage across the bulk capacitor
C
b
. The inrush current is limited by the resistor
R
inr
, which is shorted by
V
inr
, after
the bulk capacitor was charged.
The bulk capacitor sources a half bridge DC-DC converter and provides the power during the specified hold-up time.
The main transformer exhibits two secondary windings for the two outputs. The resultant voltages are rectified by synchronous
rectifiers in order to provide the best efficiency. Their ripple voltages are smoothed by a dual choke and output filters. The control
logic senses the main output voltage
V
o1
and generates the gate signals for the DC-DC converter, which are transferred by isolated
drivers to the primary side.
The second output is tracking the main output voltage, but has its own current limiting circuit. If the main output voltage drops due
to over current, the second output voltage will drop as well and vice versa. Primary current sensing limits the sum of both output
currents, such allowing for loading the main output up to 140% of
I
o1 nom
.
The output voltages can be adjusted by external means. Parallel operation of several converters is possible by
connecting the T-pins together, in order to provide active current sharing. Both outputs can be connected in parallel or
in series. They exhibit a rectangular current limitation characteristic. Switchable preloads ensure good regulation even with no
load at one output.
A control output (D) and two LEDs signal correct operation of the converter. In case of an output overvoltage of the main output,
the converter is disabled by a latch.
When the input voltage is too high, the overvoltage lockout disables the DC-DC converter and protects it from damage.
Temperature sensors on the primary and secondary side prevent the converter from excessive warm-up.
A cooling plate for chassis-mounting is available (opt. B, B1).
JM190b
NTC
Boost converter
(65 kHz)
N~ 26
28
Fuse
2
C
Y
Magnetic
feedback
Secondary
control
logic
16 R
18 i
20 D
22 T
Isolation
VDR
DC-DC converter
(110 kHz)
C
b
+
Synchr.
rect. drive
Input filter
Bridge retifier
Bridge retifier
C
x
Output 2
filter
+
C
Y
C
Y
12 Vo2+
14 Vo2–
4
Vo1+
6
10
Vo1–
8
NTC
Primary
control
V
inr
R
inr
Synchr.
rect. drive
V
PL2
Output 1
filter
L~ 30
32
+
C
Y
C
Y
Fuse
1
C
Y
24
Auxiliary
converter
V
PL1
1
Fuse not fitted with opt. F0
2
Additional fuse only fitted with opt. F2
Fig. 1
Block diagram
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Page 3 of 22
LR Series
General conditions:
240 – 300 Watt AC-DC and DC-DC Converters
Electrical Input Data
- T
A
= 25 °C, unless
T
C
is specified.
- Pin 18 (i) connected to pin 8, pin 16 (R), pin 18 (D), and pin 22 (T) left open-circuit.
Table 2: Input data
Model
Characteristics
V
i
V
i cont
V
i DC
V
i nom
I
i
P
i 0
P
i inh
C
b
t
hu
t
on
V
i abs
1
LR
Conditions
I
o
= 0 –
I
o nom
T
C min
to
T
C max
50 – 60 Hz
V
i nom,
I
o nom
V
i min
–
V
i max,
I
o
= 0
Converter inhibited
V
i
= 0 AC or DC,
I
o nom
V
i
= 0 →
V
i nom
,
I
o nom
<2s
-400
20
500
400
-400
1.3
360
20
min
100
90
125
(110) 230
(2.5) 1.2
15
2
typ
max
240
264
300
min
100
90
125
LRP
typ
max
240
264
300
(110) 230
(3.1) 1.5
15
1.3
360
500
400
2
Unit
Rated input voltage range
Operating input voltage range
Continuous DC input voltage range
Nominal input voltage
1
Input current
No-load input power
Idle input power
Boost capacitance
Interruption time
Start-up time
Input voltage limits without damage
VAC
1
VDC
VAC
A
W
µF
ms
V
peak
Rated input frequency: 50 – 60 Hz, operating frequency: 47 – 63 Hz.
Input Fuse and Protection
A VDR together with the input fuse and a symmetrical input filter form an effective protection against high input transient voltages.
If option F0 was chosen, the installer has to provide an external circuit breaker or fuse according to table 3. Without option F, a fuse
is incorporated in the phase line (pins 30 + 32). A second fuse in the neutral line may be necessary in certain applications (option F2);
see
Options
and
Installation Instructions.
Table 3:
Fuse specification (AC input voltage)
Model
LR2320, LR2540
LRP2320, LRP2540
Fuse rating (AC input)
6.3 A, 250 V, slow, 5 × 20 mm
6.3 A, 250 V, slow, 5 × 20 mm
Reference
SCHURTER 0001.2512.PT
Input Under- /Overvoltage Lockout
If the input voltage is below approx. 80 VAC or exceeds
V
i op max
, an internally generated inhibit signal disables the outputs. If
V
i
is below
V
i min
, but above the undervoltage lockout level, the output voltage may be below the value specified in the tables
Electrical Output Data.
Inrush Current Limitation
All models exhibit an electronic inrush current limitation to protect connectors and switching devices against damage.
Efficiency
95
90
LRP2320_efficiency
efficiency %
85
Vi=230Vac
80
Vi=110Vac
Vi=90Vac
75
70
0
2
4
6
8
10
12
14
Output
current
per output [A], Io1=Io2
Fig. 2
Efficiency versus V
i
and I
o
(LRP2320, both outputs connected in series)
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Page 4 of 22
LR Series
General Conditions:
240 – 300 Watt AC-DC and DC-DC Converters
Electrical Output Data
–
T
A
= 25 °C, unless
T
C
is specified.
– Pin 18 (i) connected to pin 8, pin 16 (R), pin 20 (D), and pin 22 (T) left open-circuit.
Table 4a: Output data of LR2320 and LRP2320
Model (Nom. output voltage)
Characteristics
V
o
V
o BR
I
o nom
I
o1L,
I
o2L
I
o12L
V
o
V
o adj
∆V
o u
V
o d
t
od
α
vo
1
2
3
4
5
6
7
LR2320 (2 x 12 V)
Conditions
V
i nom
, 0.5
I
o nom
Output 2
V
i min
–
V
i max
T
C min
– T
C max
V
i nom
,
I
o nom
BW = 20 MHz
V
i min
–
V
i max
(0.1 – 1)
I
o nom
V
i nom,
0.5
I
o2 nom
I
o1 nom
↔
0.5
I
o1 nom
and after turn on
I
o nom
T
C min
– T
C max
6.0
Output 1
min
11.93
typ
12.0
-
10
7
10.5
21
2
60
13.2
1
±120
±200
1
0.02
3
LRP2320 (2 x 12 V)
Output 1
max
min
11.93
15.8
10
typ
12.0
-
12.5
7
13
26
2
60
6.0
60
13.2
1
±120
±250
1
0.02
3
Unit
typ
12.0
max
V
Output 2
max
12.07
14.3
min
typ
12.0
Output 2
max
12.07
14.3
12.5
21.25
7
13
-
60
mV
pp
V
A
min
Output voltage
Output protection
(suppressor diode)
Output current nom.
1
Output current limit
1
Output current limit
1, 2
Output noise
incl.
spikes
6
Adjustment by R-input
4
Static line/load regulation
(total deviation of
V
o
)
Dynamic
load
regulation
Voltage
deviation
5
Recovery
time
5
15.8
17
7
10.5
-
3
3
mV
±200
3
±250
3
ms
%/K
Temperature coefficient
of output voltage
-
-
If
V
o
is increased above
V
o nom
through R-, or T-input, the output currents should be reduced so that
P
o nom
is not exceeded.
Both outputs connected in parallel
See
Output voltage regulation
For battery charger application, a defined negative temp. coefficient can be provided by using a temp. sensor (see
Accessories)
See
Dynamic load regulation
Measured with a ceramic cap of 1 µF across each output.
I
o1
can be increased to 140% of
I
o1 nom
if
I
o2
is reduced accordingly
tech.support@psbel.com
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BCD.00580 Rev AE, 27-Jun-2019
© 2019 Bel Power Solutions & Protection
Page 5 of 22
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