= +25°C under nominal line voltage and full-load conditions unless otherwise noted. For testing and specification purposes, "full load" is
defined as 2.75A on the primary +5V output and ±250/200mA on the auxiliary ±12/15V outputs. This corresponds to a total output power of 19.75W.
Ripple/Noise (R/N) measured over a 20MHz bandwidth.
For the +5V output, listed spec applies over the 10% to 100% load range. For the ±12/15V outputs, listed spec applies for balanced loads over the 20% to 100% load range.
Nominal line voltage, no-load/full-load conditions.
PART NUMBER STRUCTURE
M E C H A N I C A L S P E C I F I C AT I O N S
T WR
-
5
/
3000
-
15
/
500
-
D48 A
Output
Configuration:
T
= Triple
Wide Range Input
Nominal Primary Output
Voltage (+5 Volts)
Maximum Primary Output
Current in mA
A-Series
High Reliability
Input Voltage Range:
D12
= 9-36 Volts
(24V nominal)
D48
= 18-75 Volts
(48V nominal)
Maximum Auxiliary Output
Currents in mA from each output
Nominal Auxiliary Output
Voltages (±12 or ±15 Volts)
0.200
(5.08)
0.45
(11.43)
2.00
(50.80)
METAL CASE
Case C4
INSULATED BASE
0.20 MIN
(5.08)
0.040 ±0.002 DIA.
(1.016 ±0.051)
1.800
(45.72)
0.10
(2.54)
5
6
T E M P E R AT U R E D E R AT I N G
0.400
(10.16)
1
2
7
4
8
0.100
(2.54)
BOTTOM VIEW
1.200
(30.48)
3 EQ. SP. @
0.400 (10.16)
2.00
(50.80)
20
19
18
17
16
15
0.40
(10.16)
Output Power (Watts)
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
–40
0
40
45
50
55
60
65
70
75
80
85
90
95
100
I/O Connections
Pin
1
2
3
4
5
6
7
8
Ambient Temperature (°C)
Notes:
For "D12A" models, the case
is connected to pin 2 (–V
IN
).
For "D48A" models, the case
is connected to pin 1 (+V
IN
).
Function P13
+Input
–Input
No Pin
On/Off Control
+12V/15V Out
+5V Out
Common
–12V/15V Out
2
2 0 W, T R I P L E
OUTPUT
DC/DC
CONVERTERS
TWR Models
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and "full-load" conditions, unless noted.
Input
Input Voltage Range:
"D12A" Models
"D48A" Models
Input Current
Input Filter Type
Overvoltage Shutdown:
"D12A" Models
"D48A" Models
Reverse-Polarity Protection
On/Off (Sync.) Control
(Pin 4)
V
OUT
Accuracy
(50% loads):
+5V Output
±12V or ±15V Outputs
Temperature Coefficient
Ripple/Noise
(20MHz BW)
Line/Load Regulation
Efficiency
Isolation Voltage
Isolation Capacitance
Current Limiting
Overvoltage Protection
Transient Response
(50% load step)
Switching Frequency
Operating Temperature
(ambient):
Without Derating
With Derating
Storage Temperature
Dimensions
Shielding
Case Connections:
"D12A" Models
"D48A" Models
Case Material
9-36 Volts (24V nominal)
18-75 Volts (48V nominal)
See Ordering Guide
Pi
40 Volts
80 Volts
Yes (Instantaneous, 6A maximum)
TTL high = off, low (or open) = on
Input Voltage:
"D12" Models
"D48" Models
Absolute Maximum Ratings
44 Volts
88 Volts
Current must be <6A. Brief
duration only. Fusing recommended.
6.8 Volts, limited duration
±15 Volts, limited duration
±18 Volts, limited duration
Current limited.
Max. currents are
model dependent. Units can
withstand a continuous output
short on any output for 3 minutes.
–40 to +105°C
+300°C
Input Reverse-Polarity Protection
Output Overvoltage Protection
+5V Output
±12V Outputs
±15V Outputs
Output Current
Output
Storage Temperature
±1%
±3%
±0.02% per °C
See Ordering Guide
See Ordering Guide
See Ordering Guide
1500Vdc, minimum
500pF
Auto-recovery
Zener/transorb clamps, magnetic feedback
TECHNICAL NOTES
Lead Temperature
(soldering, 10 sec.)
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.
Filtering and Noise Reduction
All A-Series TWR 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 noise may be further reduced by installing
electrolytic capacitors across the input terminals and/or low-ESR tantalum or
electrolytic capacitors across the output terminals. Output capacitors should be
connected between their respective output pin (pin 5, 6 or 8) and Common (pin
7). The caps should be located as close to the power converters as possible.
Typical values are listed below. In many applications, using values greater than
those listed will yield better results.
To Reduce Input Ripple
"D12A" Models
"D48A" Models
To Reduce Output Ripple
+5V Output
±12/15V Outputs
20µF, 50V
10µF, 100V
47µF, 10V, Low ESR
33µF, 20V, Low ESR
Dynamic Characteristics
300µsec max. to ±2% of final value
165kHz (±15kHz)
Environmental
–40 to +55°C
to +100°C (See Derating Curve)
–40 to +105°C
Physical
2" x 2" x 0.45" (51 x 51 x 11.4mm)
5-sided
Pin 2 (–V
IN
)
Pin 1 (+V
IN
)
Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
Brass, solder coated
2.7 ounces (77 grams)
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.
Pin Material
Weight
These converters require 10% min. loading on their primary output and 20% min. loading on
their auxiliary outputs to maintain specified regulation. Operation under no-load conditions will
not damage the devices; however they may not meet all listed specifications. For testing and
specification purposes, "full load" is defined as 2.75A on the primary +5V output and ±250/
200mA on the auxiliary ±12/15V outputs. This corresponds to a total output power of 19.75W.
Application-specific internal input/output filtering can be recommended or perhaps added
internally upon request. Contact DATEL Applications Engineering for details.
Applying a voltage to the Control pin when no input power is applied to the converter can
cause permanent damage to the converter.
Devices can be screened or modified for higher guaranteed isolation voltages.
Contact DATEL Applications Engineering for details.
3
A Series
2 0 W, T R I P L E
OUTPUT
DC/DC
CONVERTERS
Input Fusing
Certain applications and/or safety agencies may require the installation of fuses
at the inputs of power conversion components. For DATEL A-Series TWR 20
Watt DC/DC Converters, you should use slow-blow type fuses with values no
greater than 4A for "D12A" models and 2A for "D48A" models.
On/Off Control
The On/Off Control pin (pin 4) may be used for remote on/off operation. A TTL
logic high (+2 to +5 Volts, 250µA max.) applied to pin 4 disables the converter.
A TTL logic low (0 to +0.8 Volts, 70µA max.), or no connection, enables the
converter. Control voltages should be referenced to pin 2 (–Input). Applying a
voltage to the Control pin when no input power is applied to the converter can
cause permanent damage to the converter.
Synchronization
In critical applications employing multiple switching DC/DC converters, it may
be desirable to intentionally synchronize the switching of selected converters
(so the system noise can be reduced with notch filtering) or to purposely
desynchronize the converters (to lessen the current-carrying requirements on
intermediate dc buses). For multiple A-Series Converters, an external clock
can be applied to pin 4 (Control) of each device. It should be a square wave
with a maximum 1µsec "high" duration and an amplitude between +2V and
+5V (see On/Off Control) referenced to pin 2 (–Input). The frequency of the
synchronizing clock should be higher than that of any individual converter.
Therefore, it should be 185kHz ±5kHz.
Typical Performance Curves
(T
A
= +25°C)
The performance curves below were derived from actual test data for a single model number (TWR-5/3000-12/250-D48).
Since all devices in this series have the same circuit architecture, the performance curves are representative for all devices.
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