DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 · Email: [email protected] · Internet: www.datel.com
–V
IN
(1)
+V
IN
(3)
OPTO
ISOLATION
PWM
CONTROLLER
REFERENCE &
ERROR AMP
INPUT UNDERVOLTAGE, INPUT
OVERVOLTAGE, AND OUTPUT
OVERVOLTAGE COMPARATORS
* Can be ordered with positive (standard) or negative (optional) polarity.
REMOTE
ON/OFF
CONTROL*
(2)
+SENSE
(7)
–SENSE
(5)
+V
OUT
(8)
V
OUT
TRIM
(6)
–V
OUT
(4)
SWITCH
CONTROL
Single Output
USQ 20A Models
High-Density, Quarter-Brick
20 Amp, DC/DC Converters
For low-voltage, high-current power . . . in the smallest space . . . over the widest
temperature range . . . call on DATEL’s USQ Series 20 Amp "quarter bricks." Occupy-
ing the industry-standard package (1.45" x 2.28" x 0.40") and pinout, USQ’s house
their fully-synchronous, forward design topology in a "two-board" assembly crowned
with a heat-sink-compatible aluminum baseplate. This combination of outstanding
thermal and electrical efficiencies endows USQ’s with industry-leading, thermal-
derating performance. The 1.8V
OUT
model, for example, delivers its full 20 Amps up to
+55
°
C with a mere 200 lfm air flow.
USQ’s achieve all the performance metrics required for contemporary, on-board
power processing: high isolation (1500Vdc), superior efficiency (to 91%), tight regula-
tion (to
±
0.05% max. line and load), low noise (to 50mVp-p), quick step response
(200
µ
sec), and an array of protection features. I/O protection includes input under-
voltage lockout and reverse-polarity protection, as well as output overvoltage pro-
tection, current limiting, short-circuit protection, and thermal shutdown. The USQ
functionality suite includes remote on/off control (positive or negative polarity), output
trim (+10/–20%), and output sense functions.
All USQ DC/DC’s are designed to meet the BASIC insulation requirements of
UL1950 and EN60950, and all 48 Volt models will carry the CE mark. Safety certifica-
tions, as well as EMC compliance testing and qualification testing (including HALT)
have been successfully completed. Contact DATEL for copies of the latest reports.
Figure 1. Simplified Schematic
Features
Standard, 1.45" x 2.28" x 0.40"
quarter-brick package and pinout
Outstanding thermal-derating
Output current: to 20 Amps
Outputs Voltages:
1.2/1.5/1.8/2.5/3.3/5/12/15/18/24V
Input voltage ranges:
36-75V (48V nom.)
18-36V (24V nom.)
Synchronous rectification yields high
efficiency (to 91%) and stable no-load
operation
On/Off control, trim and sense functions
Fully isolated, 1500Vdc guaranteed
Fully I/O protected; Thermal shutdown
UL1950/EN60950 (BASIC insulation)
approvals
Qual tested; HALT tested; EMI compliant
®
®
A SUBSIDIARY OF C&D TECHNOLOGIES
