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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

(1)

(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*

)

+SENSE

)

–SENSE

)

OUT

(8)

VOUT

TRIM

)

–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

(200µsec), 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

OBSOLETE PRODUCT

Contact Factory for Replacement Model

1 2 3 4 5 6 ... 21 22

Sommario

Pagina 1 - Single Output

DATEL, Inc., Mansﬁeld, MA 02048 (USA) · Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 · Email: [email protected] · Internet: www.da

Pagina 2 - OBSOLETE PRODUCT

USQ Series Load Conditions ➀ Performance Speciﬁcations 1.2VOUT 1.5VOUT 1.8VOUT 2.5VOUT 3.3VOUT 5VOUT 12 to 24VOUT Load Step = 50 to 7

Pagina 3

USQ ModelsTypical Performance Curves for 1.2VOUT Models90858075706560USQ-1.2/20-D48 Efficiency vs. Line Voltage and Load Current 2 4 6 8 10 12 14 16

Pagina 4

USQ SeriesTypical Performance Curves for 1.5VOUT Models

Pagina 5

USQ ModelsTypical Performance Curves for 1.8VOUT Models     

Pagina 6 - Trim Equations

USQ SeriesTypical Performance Curves for 2.5VOUT ModelsStart-Up from VIN(VIN = 48V, IOUT = 20A, COUT = 10µF tantalum || 1µF ceramic.)2msec/div1V/div20

Pagina 7

USQ ModelsTypical Performance Curves for 3.3VOUT Models

Pagina 8

USQ SeriesTypical Performance Curves for 5VOUT ModelsStart-Up from VIN(VIN = 48V, IOUT = 20A, COUT = 10µF tantalum || 1µF ceramic.)2msec/div1V/div20V/

Pagina 9 - OUT Return

USQ ModelsTypical Performance Curves for 5VOUT Models

Pagina 10 - OUT = 220µF

USQ SeriesTypical Performance Curves for 12VOUT ModelsStart-Up from VIN(VIN = 48V, IOUT = 8.3A, COUT = 10µF tantalum || 1µF ceramic.)2msec/div5V/div20

Pagina 11 - USQ Models

USQ ModelsStart-Up from Remote On/Off Control(VIN = 48V, IOUT = 8.3A, COUT = 10µF tantalum || 1µF ceramic.)2msec/div5V/div2V/div12VOUT (pin 8)Remote O

Pagina 12 - USQ Series

USQ SeriesUSQ-1.2/20-D48 1.2 20 25 50 ±0.05% ±0.05% 48 36-75 0.63/0.87 80% C33, P32USQ-1.5/20-D48 1.5 20 40 65 ±0.05% ±0.05% 48 36

Pagina 13

USQ SeriesTypical Performance Curves for 15VOUT Models20 

Pagina 14

USQ Models21Typical Performance Curves for 24VOUT ModelsStart-Up from Remote On/Off Control(VIN = 48V, IOUT = 4.2A, COUT = 10µF tantalum || 1µF cerami

Pagina 15

DS-0493D 10/04BOTTOM VIEW–InputRemote On/Off+Input+Output+SenseOutput Trim–Sense–OutputFigure 20. Industry Standard Quarter-Bri

Pagina 16

USQ ModelsRemote On/Off Control Polarity: Add "P" for positive polarity (pin 2 open = converter on) Add "N" for negativ

Pagina 17

USQ Series4Removal of Soldered USQ's from PCB'sShould removal of the USQ from its soldered connection be needed, it is very important to tho

Pagina 18

USQ Models5On/Off ControlThe primary-side, Remote On/Off Control function (pin 2) can be speciﬁed to operate with either positive or negative polarity

Pagina 19 - Control (pin 2)

USQ SeriesLOADRTRIM DOWN+OUTPUT–INPUT+INPUTON/OFFCONTROLTRIM+SENSE–OUTPUT–SENSE45136872LOADRTRIM UP+OUTPUT–INPUT+INPUTON/OFFCONTROLTRIM+SENSE–OUTPUT–S

Pagina 20

USQ Models70 1 2 3 4 5 6 7 8 9 10VOUT INCREASE (%)RESISTANCE1 x 1061 x 1051 x 1041 x 103Figure 7. USQ-1.2 Trim-Up Resistance vs. % Increase VOUT 0 1 2

Pagina 21 - 

USQ Series0 1 2 3 4 5 6 7 8 9 10VOUT INCREASE (%)RESISTANCE1 x 1081 x 1071 x 1061 x 105Figure 13. USQ-12 Trim-Up Resistance vs. % Increase VOUT 0 1 2

Pagina 22 - ISO 9001 REGISTERED

USQ ModelsLOAD+OUTPUT–INPUTSense CurrentContact and PCB resistancelosses due to IR dropsContact and PCB resistancelosses due to IR dropsSense Return+I

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