15 Watt BR Single Series DC/DC Converters
Features
Up to15 Watts of Output Power
Wide Input Range
Rated to 100°C Case Operating Temperature
24 & 48 Volt Nominal Inputs,
1.8, 2.5, 3.3, 5, 12 and 15 Volt Outputs
Five Year Warranty
Water Washable Design
Description
The Calex BR series are 15 Watt DC/DC converters in a 1" x
2" case with a 4:1 input ratio. The input voltage range is 9 to
36 VDC for 24 Volt models and 18 to 72 for 48 Volt models.
The BR series requires a low source impedance at the input
terminals by using an external capacitor (see Application
Notes). These models do not have an internal input filter.
The units are filled with a compound which allows them to
withstand a normal water wash after being soldered to a PC
board.
Model
24S1R8.4500BR
24S2R5.4500BR
24S3R3.4500BR
24S5.3000BR
24S12.1250BR
24S15.1000BR
48S1R8.4500BR
48S2R5.4500BR
48S3R3.4500BR
48S5.3000BR
48S12.1250BR
48S15.1000BR
Selection C hart
Input R ange
VD C
Min
9
9
9
9
9
9
18
18
18
18
18
18
Max
36
36
36
36
36
36
72*
72*
72*
72*
72*
72*
Output
VD C
1.8
2.5
3.3
5
12
15
1.8
2.5
3.3
5
12
15
Output
mA
4500
4500
4500
3000
1250
1000
4500
4500
4500
3000
1250
1000
*UL Recognition only applies up to 60VDC
A
Figure 1. Recommended application
2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: sales@calex.com
1
4/2001, eco# 010614-2, 020318-2, 020815-1, 030728-3, 041007-1, 060831-1
15 Watt BR Single Series DC/DC Converters
Electrical Characteristics
Unless otherwise specified, all parameters are full load, nominal line, T
A
=25°C, and thermal steady state.
Input Parameters (1)
Model
Voltage Range
Input Current , No Load
Full Load
Efficiency
Vin=24VDC, Full Load
Switching Frequency
Maximum Input Overvoltage,
100ms
Recommended Fuse
Model
Voltage Range
Input Current , No Load
Full Load
Efficiency
Vin=48VDC, Full Load
Switching Frequency
Maximum Input Overvoltage,
100ms
Recommended Fuse
MIN
NOM
MAX
TYP
TYP
TYP
TYP
MAX
24S1R8.4500BR 24S2R5.4500BR 24S3R3.4500BR
9
24
36
10
473
72
10
630
75
10
780
80
400
40
(2)
48S1R8.4500BR 48S2R5.4500BR 48S3R3.4500BR 48S5.3000BR
MIN
18
NOM
48
MAX
72*
TYP
10
10
10
10
TYP
236
320
385
377
TYP
TYP
MAX
72
75
80
400
80
(2)
83
48S12.1250BR
48S15.1000BR
10
753
83
10
744
84
10
744
84
24S5.3000BR
24S12.1250BR
24S15.1000BR
Units
VD C
mADC
%
kHz
VD C
AMPS
Units
VD C
10
372
84
10
372
84
mADC
%
kHz
VD C
AMPS
*UL Recognition only applies up to 60VDC
Output Parameters (1)
Model
Output Voltage
Output Voltage
Accuracy
Rated Load Range (3)
Load Regulation
1/4 FL - FL
Line Regulation
Vin = Min-Max VDC
Power On Overshoot
Load Transient
Recovery Time (1)
error band = ±1%
Load Transient
Overshoot
Noise (4)
bw = 0.01 - 1MHz
bw = 0 - 20 MHz
Temperature Coefficient
Short Circuit Protection,
Output to Common
MIN
TYP
MAX
MIN
MAX
TYP
MAX
TYP
MAX
TYP
TYP
TYP
TYP
TYP
TYP
MAX
150
100
150
50
150
Continuous
24S1R8.4500BR
48S1R8.4500BR
1.8
1.750
1.800
1.850
0.68
4.54
24S2R5.4500BR
48S2R5.4500BR
2.5
2.450
2.500
2.550
0.68
4.54
24S3R3.4500BR
48S3R3.4500BR
3.3
3.234
3.300
3.366
0.68
4.54
0.1
1
0.02
0.2
0.5
200
0.02
0.1
24S5.3000BR
48S5.3000BR
5
4.90
5.00
5.10
0.45
3.00
24S12.1250BR
48S12.1250BR
12
11.76
12.00
12.24
0.19
1.25
24S15.1000BR
48S15.1000BR
15
14.70
15.00
15.30
0.15
1.00
Units
VDC
VDC
ADC
%
%
V
µs
A
300
mV
peak
mV P-P
ppm/°C
NOTES:
(1)
Refer to the CALEX Application Notes for the definition of terms,
measurement circuits, and other information.
Load Transient Overshoot is the output voltage peak amplitude
referenced to the final value due to a step load change of 50-
75%. “Load Transient Overshoot” and “Dynamic Response” are
the same specification. Load Transient Recovery Time is the
time for the output to return to within the specified voltage error
band centered about the final value. “Load Transient Recovery
Time” and “Transient Response” are the same specification.
See CALEX Application Notes to determine the correct fuse. A
fuse is required only for system protection, but must be used for
reverse voltage protection of the input.
Below the minimum rated load, the output may exhibit noise
2
(4)
(5)
(6)
(7)
(8)
(2)
(3)
performance degradation. Operation with less than the minimum
rated load will not damage unit, and DC regulation is not
significantly affected.
Noise is measured per CALEX Application Notes. Output noise
is measured with a 10 µF tantalum capacitor and a 0.01µF
ceramic capacitor connected across the output pins.
The Case is tied to the -input pin.
The case thermal impedance is specified as the case temperature
rise over ambient per package watt dissipated.
Specifications subject to change without notice.
Water Washability - Calex DC/DC converters are designed to
withstand most solder/wash processes. Careful attention should
be used when assessing the applicability in your specific
manufacturing process. Converters are not hermetically sealed.
4/2001, eco# 010614-2, 020318-2, 020815-1, 030728-3, 041007-1, 060831-1
2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: sales@calex.com
15 Watt BR Single Series DC/DC Converters
General Specifications
All Models
Isolation (5)
Isolation Voltage
Input to Output 24S
Input to Output 48S
Input to Output
Capacitance
Environmental
Case Operating Range
Storage Range
Thermal Impedance (6)
General
Unit Weight
Chassis Mounting Kit
MTBF
Agency Approvals
TYP
1.1
MS8
> 1 M Hours
CSA/UL 60950
Mechanical tolerances unless otherwise noted:
X.XX dimensions: ±0.020 inches
X.XXX dimensions: ±0.005 inches
Pin location is for the matiing PCB.
The case is metal with a non-conductive header
oz
Units
±0.002
MIN
MIN
TYP
700
1500
1600
VD C
pF
MIN
MAX
MIN
MAX
TYP
-40
100
-55
125
15
°C
BOTTOM VIEW
°C
°C/Watt
Pin
1
2
3
4
Function
+INPUT
-INPUT, CASE
+OUTPUT
CMN
Note: On nominal 48Vin Models UL Recognition only applies
up to 60VDC.
Application Notes
General
Figure 1 shows the recommended connections for the 15 Watt
BR Single. Capacitor C1 is mandatory for proper operation as
the BR may be damaged if operated without it. C1 must be
rated to handle the ripple current from the BR input. L1 is
optional and serves to reduce the reflected ripple current from
the BR back into the Input Source. L1 must be rated to handle
the DC input current. Information about C1 and L1 is shown
in the following paragraphs. The fuse is required only for
system protection (Note 2).
Capacitor C2 is optional and serves to further reduce
output noise. It may be made up of several capacitors already
in your system that are distributed at the loads.
Input Capacitor
C1 in figure 1 is mandatory and must be connected across the
input pins for proper operation. Locate C1 within 1" maximum
from the input pins.
The following table lists the requirements for C1
C1 Requirements:
Model
24S
48S
Input Voltage
VD C
9 to 36
18 to 72
Required Capacitor Ripple Current
A-RMS, minimum rating
A
1.8
0.9
Suggested Capacitor P/N's:
Model
24S
P/N
4 7 0 µ F, 5 0 V, 0 .0 5 9 o hms , 2 .0 A a t +8 5 °C
Thru hole (1.2A at +105°C)
NIC: NRSZ471M50V12.5X20
6.8µF, 50V, 0.6 ohms, 0.49A at +85°C. Use
4 in parallel.
SMT
Vishay Sprague: 593D685X9050D2
6 8 µ F, 1 0 0 V, 0 . 2 4 o hm s , 1 . 0 A a t + 8 5 ° C
Thru hole (0.63A at +105°C)
NIC: NRSZ680M100V10X20
1 0 0 µ F, 1 0 0 V, 0 .1 7 o hms , 1 .1 A a t +8 5 °C
(0.79A at +105°C)
SMT
NIC: NACK101M100V16X17
Type
Input Inductor
The same inductor is suitable for both 24S and 48S models of
the BR.
24S
Suggested Inductor P/N's:
Thru hole
SMT
10µH, 4.2ADC, 0.030 ohms.
Coilcraft: RFB08010-100
10µH, 3.5ADC, 0.040 ohms.
Coilcraft: DO3340P-103
48S
48S
Equivalents are available from other manufacturers.
The ripple current and ESR ratings are at 100kHz.
Equivalents are available from other manufacturers.
2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: sales@calex.com
3
4/2001, eco# 010614-2, 020318-2, 020815-1, 030728-3, 041007-1, 060831-1
0.3 TYP
SIDE VIEW
15 Watt BR Single Series DC/DC Converters
Input Filter:
Using an input filter with the values shown gives the following results:
Model
24S
48S
C1
L1
Reflected Ripple Current
About 50mA P-P
About 20mA RMS
About 25mA P-P
About 12mA RMS
Four
10µH
6.8µF / 50V Tantalum
100µF / 100V
10µH
P-P Reflected Current does not include the switching spike.
The C1 and L1 parts listed above are suitable for the BR
operating at full power output. These C1 and L1 parts will work
up to +85°C ambient temperture, although the BR itself will
require some sort of heatsink or cooling to operate at full
power at +85°C ambient. More filtering can be accomplished
by increasing the value of C1 and lowering its ESR which is
done by paralleling capacitors. In addition adding an optional
ceramic capacitor of 0.1 to 1.0µF close to the pins will further
help reduce the spike.
Increasing the value of L1 requires at least a proportional
increase in the value of C1. i.e. If L1 is doubled then at least
double the value of C1 shown in the table. Not using L1 (but
MUST have C1) will increase the Reflected Ripple Current
back into the the Input Source power supply.
Measurement Technique
Using the ground clip lead on a scope probe will show sharp
switching spikes on the oscilloscope, while using a tip jack will
minimize this effect. There will generally be a switching spike
when scoping the input pins which happens because capacitor
C1 cannot be located directly on the BR input pins.
A
2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: sales@calex.com
4
4/2001, eco# 010614-2, 020318-2, 020815-1, 030728-3, 041007-1, 060831-1
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