20W, TRIPLE OUTPUT DC/DC CONVERTERS
TWR Models
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and "full-load" conditions, unless noted. ➀
Input
Input Voltage Range:
D12A Models
D48A Models
9-36 Volts (24V nominal)
18-75 Volts (48V nominal)
Input Current
See Ordering Guide
Input Filter Type ➁
Pi
Overvoltage Shutdown:
D12A Models
D48A Models
40 Volts
80 Volts
Reverse-Polarity Protection
Yes (Instantaneous, 6A maximum)
On/Off (Sync.) Control (Pin 4) ➂
TTL high = off, low (or open) = on
Output
VOUT Accuracy (50% loads):
+5V Output
±1%
±12V or ±15V Outputs
±3%
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
500pF
Current Limiting
Auto-recovery
Overvoltage Protection
Zener/transorb clamps, magnetic feedback
Dynamic Characteristics
Transient Response (50% load step) 300µsec max. to ±2% of final value
Switching Frequency
165kHz (±15kHz)
Environmental
Operating Temperature (ambient):
Without Derating
With Derating
–40 to +55°C
to +100°C (See Derating Curve)
Storage Temperature
–40 to +105°C
Physical
Dimensions
2" x 2" x 0.45" (51 x 51 x 11.4mm)
Shielding
5-sided
Case Connections:
D12A Models
D48A Models
Pin 2 (–VIN)
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 (77 grams)
➀ 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.
➁ Application-specific internal input/output filtering can be recommended or 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 converter can
cause permanent damage to the converter.
➃ D48A models have BASIC, D12A models have Functional insulation.Devices can be screened
or modified for higher guaranteed isolation voltages. Contact DATEL Applications Engineering
for details.
Absolute Maximum Ratings
Input Voltage:
"D12" Models
"D48" Models
Input Reverse-Polarity Protection
Output Overvoltage Protection
+5V Output
±12V Outputs
±15V Outputs
Output Current
Storage Temperature
Lead Temperature (soldering, 10 sec.)
44 Volts
88 Volts
Current must be <6A. Brief
durationonly.Fusingrecommended.
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
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.
TECHNICAL NOTES
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
20µF, 50V
10µF, 100V
To Reduce Output Ripple
+5V Output
±12/15V Outputs
47µF, 10V, Low ESR
33µF, 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 require-
ments. Contact our Applications Engineering Group for additional details.
3
Downloaded from DatasheetLib.com - datasheet search engine