®
®
A SUBSIDIARY OF C&D TECHNOLOGIES
Mixed Voltage, BWR Models
Dual Output
5V and 3.3V, Independent Dual Output
30 Watt, DC/DC Converters
A-SERIES
Features
Independently regulated 5V/ 3.3V outputs
5V @ 3A/3.3V @ 4.25A simultaneously
delivered
Independent V
OUT
Trim pins for margining
Independent On/Off Control pins
88% efficiency; 75mV ripple/noise
Input ranges: 10-18V, 18-36V or 36-75V
UL 1950 and EN60950 safety approvals
Fully isolated, 1500Vdc guaranteed
Input under and overvoltage shutdown
Independent OVP; short circuit protection
Thermal shutdown
DATEL's BWR series of DC/DC converters now includes two independent con-
verters in one 2" x 2" package. The BWR-5/3-3.3/4.25 family provides both 5V at 3
Amps and 3.3V at 4.25 Amps for a combined output power of 30 Watts from input
ranges of 10V to 18V (-D12A), 18 to 36V (-D24A), or 36 to 75V (-D48A).
Each output is regulated by its own control loop to provide ±1% load and ±0.5%
line regulation. Individual trim pins and a negative or positive on/off control pin
allow independent adjustment of output voltages and any combination of power-on
sequencing between the 5V and 3.3V outputs. A high efficiency of 88% allows full
load operation up to +65°C ambient temperature in a still air environment. Although
functionally independent, both outputs are driven from synchronized PWMs to pre-
vent asynchronously generated beat frequencies.
Housed in a plastic case, all models include input Pi filtering, input overvolt-
age protection, independent output short circuit and current limiting protection and
independent output overvoltage protection as well as thermal shutdown. These
devices meet IEC950, UL1950 and EN6950 safety standards. CB reports are avail-
able upon request. "D48A" models are CE marked (meet LVD requirements).
+INPUT
(1)
+5V OUTPUT
(5)
–INPUT
(2)
SWITCH
CONTROL
5V ON/OFF
CONTROL
(3)
INPUT UNDERVOLTAGE
AND OVERVOLTAGE
COMPARATORS
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
+5V OUTPUT
RETURN
(6)
+5V TRIM
(7)
+3.3V TRIM
(10)
3.3V ON/OFF
CONTROL
(4)
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
+3.3V OUTPUT
(9)
SWITCH
CONTROL
+3.3V OUTPUT
RETURN
(8)
Figure 1. Simplified Schematic
DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 · Email: sales@datel.com · Internet: www.datel.com
A-Series
3 0 W, D UA L O U T P U T, M I X E D - VO LTAG E D C / D C C O N V E R T E R S
Performance Specifications and Ordering Guide
V
OUT
(Volts)
5
3.3
5
3.3
5
3.3
➀
Input
Regulation (Max.)
Line
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
Model
BWR-5/3-3.3/4.25-D12A
BWR-5/3-3.3/4.25-D24A
BWR-5/3-3.3/4.25-D48A
➀
➁
➂
➃
➄
I
OUT
➁
(Amps)
3
4.25
3
4.25
3
4.25
Output
R/N (mVp-p)
➂
Typ.
75
75
75
75
75
75
Max.
100
100
100
100
100
100
Load
➃
±1%
±1%
±1%
±1%
±1%
±1%
V
IN
Nom.
(Volts)
12
24
48
Range
(Volts)
10-18
18-36
36-75
I
IN
➄
(mA)
210/2846
115/1374
70/687
Efficiency
Min.
83%
85.5%
85.5%
Typ.
85%
88%
88%
Package
(Case,
Pinout)
C20, P42
C20, P42
C20, P42
Typical at T
A
= +25°C under nominal line voltage and "full-load" conditions.
Any combination of 5V/3.3V current, not to exceed the published I
OUT
specification (30 Watts).
Ripple/Noise (R/N) measured over a 20MHz bandwidth with 0.47µF ceramic output capacitors.
Tested from 10% load to 100% load.
Nominal line voltage, no load/full load condition.
PA R T N U M B E R S T R U C T U R E
BWR
-
5
/
3
-
3.3
/
4.25
-
D48
A
N
LX
Dual Output/
Mixed-Voltage Series
V
1
Nominal Output Voltage:
5 Volts
I
1
Maximum Output Current:
3 Amps
V
2
Nominal Output Voltage:
3.3 Volts
Optional Functions
Optional Functions
BWR 30 Watt DC/DC's are designed so a negative logic
on/off control ("N" suffix) can be added in the pins 3 and 4 position.
Blank
N
L1
L2
A-Series
High Reliability
Input Voltage Range:
D12A
= 10-18 Volts (12V nominal)
D24A
= 18-36 Volts (24V nominal)
D48A
= 36-75 Volts (48V nominal)
I
2
Maximum Output Current:
4.25 Amps
Standard product. No options specified.
Negative polarity on/off control
Pin length: 0.110 in. (2.79mm) ±0.010
Pin length: 0.145 in. (3.68mm) ±0.010
Refer to the last page for additional options.
M E C H A N I C A L S P E C I F I C AT I O N S
2.00
(50.08)
PLASTIC CASE
0.48
(12.19)
Case C20
STANDOFF
0.020 (0.51)
I/O Connections
Pin
1
2
3
4
5
6
7
8
9
10
Function P42
+Input
–Input
+5V On/Off
+3.3V On/Off
+5V Output
+5V Return
+5V Trim
+3.3V Return
+3.3V Output
+3.3V Trim
0.20 MIN
(5.08)
0.040 ±0.001 DIA.
(1.016 ±0.025)
1.800
(45.72)
0.10
(2.54)
5
6
1
0.600
(15.24)
3 EQ. SP. @
0.200 (5.08)
7
1.200
(30.48)
1.600
(40.64)
2.00
(50.80)
2
3
4
0.300
(7.62)
8
9
10
0.600
(15.24)
1.000
(25.40)
BOTTOM VIEW
DIMENSIONS ARE IN INCHES (MM)
0.200
0.20 (5.08)
(5.08)
2
3 0 W, D UA L O U T P U T, M I X E D - VO LTAG E D C / D C C O N V E R T E R S
BWR Models
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage, balanced "full-load" conditions, unless noted.
➀
Input
Input Voltage Range:
D12A Models
D24A Models
D48A Models
Overvoltage Shutdown:
D12A Models
D24A Models
D48A Models
Start-Up Threshold:
D12A Models
D24A Models
D48A Models
Undervoltage Shutdown:
D12A Models
D24A Models
D48A Models
Input Current:
Normal Operating Conditions
Standby Mode:
Off, OV, UV, Thermal Shutdown
Input Reflected Ripple Current:
Source Impedance
D12A Models
D24A/D48A Models
Internal Input Filter Type
Reverse-Polarity Protection:
D12A Models
D24A Models
D48A Models
On/Off Control
(Pins 3 & 4):
➂ ➄
D12A, D24A & D48A Models
10-18 Volts (12V nominal)
18-36 Volts (24V nominal)
36-75 Volts (48V nominal)
18.5-21 Volts (20V nominal)
37-40 Volts (38V typical)
77-81 Volts (79V typical)
9.4-10 Volts (9.6V typical)
16.5-18 Volts (17V typical)
34-36 Volts (35V typical)
7-8.5 Volts (8V typical)
16-17.5 Volts (16.5V typical)
32.5-34.5 Volts (33.5V typical)
See Ordering Guide
10mA typical
<0.1Ω, no external input filtering
TBD
TBD
Pi (0.022µF - 4.7µH - 2.46µF)
1 minute duration, 6A maximum
1 minute duration, 4A maximum
1 minute duration, 2A maximum
On = open or 13V to +V
IN
,
I
IN
= 1.6mA @ 13V
Off = 0-0.8V, I
IN
= 2mA @ 0V
On = 0-1.2V, I
IN
= 2mA @ 0V
Off = open.
Overvoltage Protection:
5V Output
3.3V Output
Maximum Capacitive Loading
D12A Models 3.3V
5V
D24A, D48A Models 3.3V
5V
Temperature Coefficient
Output (continued)
Magnetic feedback, transorb
6.0 Volts
4.1 Volts
1000µF
680µF
1000µF
680µF
±0.02% per °C
Dynamic Characteristics
Dynamic Load Response:
5V (50-100% load step to 1% V
OUT
)
3.3V (50-100% load step to 1% V
OUT
)
Start-Up Time:
➁
V
IN
to V
OUT
On/Off to V
OUT
Switching Frequency
MTBF
➅
D12A Models
D24A Models
D48A Models
Operating Temperature
(Ambient):
➁
Without Derating:
D12A Models
D24A & D48A Models
With Derating
Case Temperature:
Maximum Operational
For Thermal Shutdown
Storage Temperature
Dimensions
Case Material
Pin Material
Weight:
200µsec maximum
200µsec maximum
10ms
TBD
355kHz (±35kHz)
Environmental
Bellcore, ground fixed, full power
25°C ambient
873.9 thousand hours
1.32 million hours
1.23 million hours
–40 to +60°C
–40 to +65°C
To +100°C (See Derating Curves)
+100°C
+100°C minimum, +110°C maximum
–40 to +120°C
"N" Suffix Models
➇
Physical
2" x 2" x 0.5" (50.8 x 50.8 x 12.7mm)
Diallyl phthalate, UL94V-0 rated
Brass, solder coated
2.7 ounces (76.5 grams)
Output
V
OUT
Accuracy
5V Output
3.3V Output
Minimum Loading Per Specification
Minimum Loading For Stability
➆
Ripple/Noise
(20MHz BW)
➃
Line/Load Regulation
Efficiency
Trim Range
➁
Isolation Voltage:
Input-to-Output
Isolation Resistance
Isolation Capacitance
Current Limit Inception:
5V @ 98.5% V
OUT
3.3V @ 98.5% V
OUT
Short Circuit Current:
5V Output
3.3V Output
±1.5% maximum
±1.5% maximum
10% of I
OUT
maximum
No load
See Ordering Guide
See Ordering Guide
See Ordering Guide
±5%
1500Vdc minimum
100MΩ
470pF
3.8-5.1 Amps
5.4-6.8 Amps
3.0 Amps average current
3.0 Amps average current
Primary to Secondary Insulation Level
Operational
➀
All models are specified with external 0.47µF ceramic output capacitors.
➁
See Technical Notes/Graphs for details.
➂
Applying a voltage to On/Off Control (pins 3 & 4) when no input power is applied to the
converter can cause permanent damage.
➃
Output noise may be further reduced with the installation of additional external output
capacitors. See Technical Notes.
➄
On/Off control is designed to be driven with open collector or by appropriate voltage
levels. Voltages must be referenced to the –Input (pin 2).
➅
Demonstrated MTBF available on request.
➆
For conditions with less than minimum loading, outputs remain stable. However, regulation
performance will degrade.
➇
Maximum applied voltage to On/Off pin (N suffix) less than 19.0V.
3
A-Series
3 0 W, D UA L O U T P U T, M I X E D - VO LTAG E D C / D C C O N V E R T E R S
Absolute Maximum Ratings
Input Voltage:
Continuous:
D12A Models
D24A Models
D48A Models
Transient (100msec): D12A Models
D24A Models
D48A Models
23 Volts
42 Volts
81 Volts
25 Volts
50 Volts
100 Volts
Input Current must be limited. 1 minute
duration. Fusing recommended.
6 Amps
4 Amps
2 Amps
Current limited. Devices can withstand
an indefinite output short circuit.
1
+INPUT
+5V OUTPUT
5
+5V LOAD
+5V RETURN
6
2
–INPUT
+5V TRIM
7
5V R
TRIM DOWN
3
+5V
ON/OFF
CONTROL
+3.3V
ON/OFF
CONTROL
+3.3V RETURN
8
Input Reverse-Polarity Protection
D12A Models
D24A Models
D48A Models
Output Current
➁
4
+3.3V OUTPUT
9
+3.3V LOAD
+3.3V TRIM
10
3.3V R
TRIM DOWN
5V R
T
DOWN
(kΩ) =
2.49(V
O
– 2.52)
5 – V
O
–15
3.3V R
T
DOWN
(kΩ) =
2.49(V
O
– 1.27)
3.3 – V
O
–14.3
On/Off Control (Pins 3 & 4) Max. Voltages
Referenced to –Input (pin 2)
D12A, D24A & D48A Models
+V
IN
"N" Models
±19V
Storage Temperature
Lead Temperature
(Soldering, 10 sec.)
–40 to +120°C
+300°C
Figure 3. Trim Connections To Decrease Output Voltages Using Fixed Resistors
5
+5V OUTPUT
1
+INPUT
+5V RETURN
+5V LOAD
6
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specifications Table is not implied, nor recommended.
2
–INPUT
+5V TRIM
7
5V R
TRIM UP
3
+5V
ON/OFF
CONTROL
+3.3V
ON/OFF
CONTROL
+3.3V RETURN
8
TECHNICAL NOTES
4
+3.3V OUTPUT
9
+3.3V LOAD
+3.3V TRIM
10
Trimming Output Voltages
These BWR converters have a trim capability (pins 3 & 4) that allow users
to independently adjust the output voltages ±5%. Adjustments to the output
voltages can be accomplished via a trim pot, Figure 2, or a single fixed
resistor as shown in Figures 3 and 4. A single fixed resistor can increase
or decrease the output voltage depending on its connection. Fixed resistors
should have absolute TCR's less than 100ppm/°C to minimize sensitivity to
changes in temperature.
A single resistor connected from the 5V Trim pin (pin 7) to the +5V Output
(pin 5), see Figure 3, will decrease the +5V output voltage. A resistor con-
nected from the +5V Trim (pin 7) to the +5V Return (pin 6) will increase the
+5V output voltage. See Figure 4.
Similarly, the 3.3V output can be adjusted using a single resistor connected
from the +3.3V Trim (pin 10) to the +3.3V Output (pin 9) or to the +3.3V
Return (pin 8). See Figures 3 and 4.
5V R
T
UP
(kΩ) =
3.3V R
TRIM UP
6.27
V
O
– 5
–15
3.3V R
T
UP
(kΩ) =
3.16
V
O
– 3.3
–14.3
Figure 4. Trim Connections To Increase Output Voltages Using Fixed Resistors½
Note: Resistor values are in kΩ. Accuracy of adjustment is subject to
tolerances of resistors and factory-adjusted output accuracy.
V
O
= desired output voltage.
Typical Performance Curves
Output Power vs. Ambient Temperature
(V
IN
nominal, natural convection air flow.)
35
30
D24A, D48A
MODELS
Output Power (watts)
+5V OUTPUT
1
+INPUT
+5V TRIM
5
25
20
15
10
5
0
–40
7
2
20kΩ
5-22
TURNS
+5V
LOAD
D12A MODELS
–INPUT
+5V RETURN
+3.3V RETURN
6
8
3
+5V
ON/OFF
CONTROL
+3.3V
ON/OFF
CONTROL
+3.3V TRIM
10
4
20kΩ
5-22
TURNS
+3.3V
LOAD
+3.3V OUTPUT
9
–10
0
10
20
30
40
50
60
70
80
90
100
Figure 2. Trim Connections Using A Trim Pot
Ambient Temperature (°C)
4
3 0 W, D UA L O U T P U T, M I X E D - VO LTAG E D C / D C C O N V E R T E R S
BWR Models
Typical Performance Curves
Typical Start-Up from V
IN
(V
IN
= nominal, 5V @ 3A/3.3V @ 4.25A, 0.47µF output capacitors.)
D24A Models: Efficiency vs. Line and Load
89
88
V
IN
87
86
Efficiency (%)
85
84
83
82
81
80
79
18
24
5V@0.3A, 3.3V@4.25A
5V@3A, 3.3V@2.325A
5V@1.65A, 3.3V@4.25A
5V@3A, 3.3V@0.4A
5V
OUT
3.3V
OUT
30
36
Line Voltage (Volts)
2.5msec/div
D12A Models: Efficiency vs. Line and Load
87
5V@3A, 3.3V@4.25A
D48A Models: Efficiency vs. Line and Load
89
5V@3A, 3.3V@2.325A
85
87
Efficiency (%)
5V@3A, 3.3V@0A
81
Efficiency (%)
83
85
83
5V@0.3A, 3.3V@4.25A
5V@3A, 3.3V@0.4A
5V@1.65A, 3.3V@4.25A
79
81
77
5V@0A, 3.3V@4.25A
79
75
10
11.14
12.29
13.43
14.57
15.71
16.86
18
77
36
48
60
Line Voltage (Volts)
75
Line Voltage (Volts)
5
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