
Figure 1. Simplied Schematic
Features
High-Reliability, Power-Sharing
20 Watt, DC/DC Converters
Triple Output
A-Series, TWR Models
Among the three families of triple-output DC/DC converters in DATEL’s new
A-Series, the 20W 2" x 2" devices are distinguished by their unique "power-sharing"
architecture. This feature enables devices to deliver the full 20 Watts of output power
under a variety of output-loading conditions. Each unit’s primary +5V output can
source any current up to 3 Amps (primary power = 15W); while its auxiliary ±12/15V
outputs can source currents up to ±500mA (auxiliary power = 12/15W). Devices
deliver any combination of primary plus auxiliary power as long as the total output
power does not exceed 20 Watts. This feature enables designers to select a single
device to fulll any number of different requirements.
As members of DATEL’s new A-Series, the 20W triples exhibit both low cost and
outstanding long-term reliability. Their design combines straightforward circuit topolo-
gies, the newest components, proven SMT-on-pcb construction methods, and highly
repeatable automatic-assembly techniques. Their superior durability is substantiated
by a rigorous in-house qualication program that includes HALT (Highly Accelerated
Life Testing).
Each device has a +5V primary output and either ±12V or ±15V auxiliary
outputs. "D12A" models achieve fully rated performance with inputs ranging from
9 to 36 Volts. "D48A" models operate over an input range of 18-75 Volts.
These full-featured triples have non-latching output current limiting, input over-
voltage shutdown, input reverse-polarity protection, and output overvoltage clamping
to protect both the power converters and their loads.
OPTO
ISOLATION
+5V
–12V (–15V)
ERROR
AMPLIFIER
PWM
CONTROLLER
+V
(1)
(2)
(4)
(5)
(6)
(7)
(8)
IN
–VIN
+12V (+15V)
COMMON
ON/OFF
CONTROL
Low cost! Highly reliable!
Full 20 Watts output power
Power "user-allocated" among outputs
Proven SMT-on-pcb construction
Qual tested; HALT tested; EMC tested
Output voltages: +5V/±12V or +5V/±15V
Ultra-wide input voltage ranges:
9-36V or 18-75V
Designed to meet UL1950/EN60950.
BASIC insulation (all 48VIN models)
mark available (75V input models)
Small packages, 2" x 2" x 0.45"
Fully isolated, 1500Vdc guaranteed
Guaranteed efciencies to 82%
–40 to +100°C operating temperature
Modications and customs for OEM’s
■
A- SERIES
DATEL, Inc., Manseld, MA 02048 (USA) Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 Email: sales@datel.com Internet: www.datel.com
INNOVATION and EXCELLENCE