15-20W, DUAL OUTPUT DC/DC CONVERTERS
BWR Models
3
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "floating." Any
BWR model may be configured to produce an output of 10V, 24V or 30V (for
±5V, ±12V or ±15V models, respectively) by applying the load across the
+Output and –Output pins (pins 5 and 7), with either output grounded. The
Common pin (pin 6) should be left open. Minimum 20% loading is
recommended under these conditions. The total output voltage span may be
externally trimmed as described below.
Filtering and Noise Reduction
All A-Series BWR 15-20 Watt DC/DC Converters achieve their rated ripple
and noise specifications without the use of external input/output capacitors.
In critical applications, input/output ripple and noise may be further reduced
by installing electrolytic capacitors across the input terminals and/or lowESR tantalum or electrolytic capacitors across the output terminals. Output
capacitors should be connected between their respective output pin (pin 5 or
7) and Common (pin 6) as shown in Figure 2. The caps should be located
as close to the power converters as possible. Typical values are listed in the
tables below. In many applications, using values greater than those listed
will yield better results.
To Reduce Input Ripple
"D5A" Models 47µF, 16V
"D12A" Models 20µF, 50V
"D48A" Models 20µF, 100V
To Reduce Output Ripple
±5V Outputs 47µF, 10V, Low ESR
±9/12/15V Outputs 22µF, 20V, Low ESR
In critical, space-sensitive applications, DATEL may be able to tailor the
internal input/output filtering of these units to meet your specific requirements. Contact our Applications Engineering Group for additional details.
Performance/Functional Specifications
T ypical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted.
➀
➀
These converters require a minimum 20% loading on each output to maintain specified
regulation.Operation under no-load conditions will not damage these devices; howeve r
they may not meet all listed specifications.
➁
Application-specific internal input/output filtering can be recommended and perhaps added
internally upon request. Contact DATEL Applications Engineering for details.
➂
Applying a voltage to the Control pin when no input power is applied to the conve rter can
cause permanent damage to the converter.
➃
Devices can be screened or modified for higher guaranteed isolation v oltages.
Contact DATEL Applications Engineering for details.
Input
Input Voltage Range:
"D5A" Models 4.7-7.5 Volts (5V nominal)
"D12A" Models 9-36 Volts (24V nominal)
"D48A" Models 18-75 Volts (48V nominal)
Input Current See Ordering Guide
Input Filter Type
➁
Pi
Overvoltage Shutdown:
"D5A" Models 10 Volts
"D12A" Models 40 Volts
"D48A" Models 80 Volts
Reverse-Polarity Protection Yes (Instantaneous, 10A maximum)
On/Off (Sync.) Control (Pin 4)
➂
TTL high = off, low (or open) = on
Output
VOUT Accuracy (50% load):
±5V Outputs ±1.5%, maximum
±9/12/15V Outputs ±1%, maximum
Temperature Coefficient ±0.02% per °C
Ripple/Noise (20MHz BW)
➁
See Ordering Guide
Line/Load Regulation See Ordering Guide
Efficiency See Ordering Guide
Isolation Voltage
➃
1500Vdc, minimum
Isolation Capacitance 550pF
Current Limiting Auto-recovery
Overvoltage Protection Zener/transorb clamps, magnetic feedback
Dynamic Characteristics
Transient Response (50% load step) 200µsec max. to ±1.5% of final value
Switching Frequency 165kHz (±15kHz)
Environmental
Operating Temperature (ambient):
Without Derating –40 to +50/55/60°C (Model dependent)
With Derating to +100°C (See Derating Curves)
Storage Temperature –40 to +105°C
Physical
Dimensions 2" x 2" x 0.45" (51 x 51 x 11.4mm)
Shielding 5-sided
Case Connection:
"D5A" and "D12A" Models Pin 2 (–V
IN)
"D48A" Models Pin 1 (+VIN)
Case Material Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
Pin Material Brass, solder coated
Weight 2.7 ounces (75.6 grams)
Input Volta ge:
"D5A" Models 12 Volts
"D12" Models 44 Volts
"D48" Models 88 Volts
Input Reverse-Polarity Protection Current must be <10A. Brief
duration only. Fusing recommended.
Output Overvoltage Protection
±5V Outputs 6.8 Volts, limited duration
±12V Outputs 15 Volts, limited duration
±15V Outputs 18 Volts, limited duration
Output Current Current limited. Max. current and
short-circuit duration are model
dependent.
Storage Temperature –40 to +105°C
Lead Temperature (soldering, 10 sec.) +300°C
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.
Absolute Maximum Ratings
TECHNICAL NOTES