DATEL UNR-5-5-D12 Datasheet

No external I/O filtering required
+10.4V to +13.6V input
+5V (±50mV), 5 Amp output
Synchronous-rectifier topology
300kHz switching frequency
Low output noise, 60mVp-p
Quick transient response, 30µsec
High efficiency, 91%
–40 to +70°C operation with no derating
On/off control; Undervoltage shutdown
Output trim capability (3.3V to 6V)
1" x 2" metal package; EMC compliant
IEC950/EN60950/UL1950 pending
Modifications and customs for OEM’s

DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: [phone] Fax: [phone] · Email: [e-mail] · Internet: www.datel.com

Single Output

UNR Series

Features

Figure 1. Simplified Schematic

Non-Isolated, 12V -to-5V

5 Amp, DC/DC Converters

When you’re faced with upgrading your system’s +5V power supply because
your new, high-speed, 5V electronics simply demand too much current, consider
tapping into your +12V line with one of DATEL’s new , low-cost, 12V-to-5V DC/DC
converters. These non-isolated buck regulators deliver up to 5 Amps of clean
(60mVp-p noise), rapidly responding (30µsec step response) 5V current. They are
housed in standard 1" x 2" metal packages and require absolutely no external
filtering to achieve specified performance.

The UNR-5/5-D12 achieves its high power density (25W/in

3

) through circuit
topology and packaging. Its 91% efficient, fixed-frequency (300kHz), synchronous­rectifier design is packaged, with thermally conductive potting compound, in a
heat-radiating, black metal case. It achieves low cost and high reliability through its
use of proven, fully automated, SMT-on-pcb assembly techniques. Consequently,
every 1 Amp of 12V current gives you 2.2 Amps of additional 5V current at an
incremental cost.

The impressively efficient UNR-5/5-D12 delivers it full rated 25W output power
over the –40 to +70°C ambient temperature range without heat sinking or forced­air cooling. Units derate to +100°C ambient. Devices are fully line (±0.25% max.)
and load (±0.5% max.) regulated and feature user-optional remote on/off control
and output-voltage trim capabilities (from 3.3 to 6 Volts).

If you need more 5V current and you’ve already rejected the use of inefficient,
step-down, linear regulators, take a look at one of DATEL's "switchers." Their high
efficiency and ease of use may surprise you. Safety agency approvals and full
EMI/EMC characterization tests are currently in progress.

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INNOVATION and EX C ELL E N C E

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+V

IN

+V

OUT

PWM

CONTROLLER

REFERENCE &

ERROR AMP

INPUT

RETURN

ON/OFF

CONTROL

OUTPUT
RETURN

CURRENT LIMITING
& S.C. SHUTDOWN

UNDERVOLTAGE

SHUTDOWN

TRIM

TRIM

OUTPUT RETURN

+V

OUT

10-20k

9

5-10
Turns

(3.3 to 6V)

UNR Series

NON-ISOLATED, 25W, SINGLE OUTPUT DC/DC CONVERTERS

Performance/Functional Specifications

Typical @ TA = +25°C under nominal line voltage and full-load conditions,
with no external I/O filtering, unless noted.

➀

Input

Input Voltage Range 10.4-13.6 Volts (12V nominal)
Input Current

➁

40/2290mA

Input Filter Type Capacitive
Overvoltage Protection None
Reverse-Polarity Protection None
Start-Up Threshold

➂

10.2V typical, 10.4V maximum

Undervoltage Shutdown

➂

9.6V typical, 8.2V minimum

On/Off Control (Pin 3)

➃

TTL high (or open) = on, low = off

Output

VOUT Accuracy (50% load) ±1% (±50mV) maximum
Temperature Coefficient ±0.02% per °C
Ripple/Noise (20MHz BW)

➄

60mVp-p typical, 85mVp-p maximum

Line/Load Regulation ±0.25% maximum/±0.5% maximum
Efficiency 91% typical, 87% minimum
Current Limiting

➅

Auto-recovery

Dynamic Characteristics

Transient Response (50% load step) 30µsec to ±1% of final value
Switching Frequency 300kHz (±30kHz)

Environmental

Operating Temperature (Ambient):

Without Derating –40 to +70°C
With Derating to +100°C ( Straight line to 0 Watts)

Storage Temperature –40 to +105°C

Physical

Dimensions 2" x 1" x 0.48" (51 x 25 x 12.2mm)
Shielding 5-sided
Case Connection Pin 2 (Input Return)
Case Material Corrosion resistant steel with

non-conductive, epoxy-based, black
enamel finish and plastic baseplate

Pin Material Brass, solder coated
Weight 1.6 ounces (45.4 grams)

➀

These devices have no minimum load requirements and will regulate under no-load conditions.

➁

No-load/full-load conditions. When the unit is off, the input "standby" current is typically 10mA.

➂

Upon start-up, devices will not regulate properly until the input voltage reaches approximately

+10.2V . If the input subsequently drops below +9.6V , devices will turn off. Restart requires
bringing the input back up to +10.2V .

➃

See On/Off Control Functionality.

➄

Output noise may be reduced by installing external capacitors across the output terminals.
Caps should be selected for low ESR (typ. 60m

W

) and located as close to the unit as possible.

➅

Current limiting initiates at approximately 30% above rated load. Under short-circuit conditions,
output current folds back to approximately 200mA and remains there until the short is removed.

Case C13

MECHANICAL SPECIFICATIONS

Input Voltage 15 Volts
Output Current Current limited. Devices can

withstand a sustained output short
circuitwithout damage.

Storage Temperature –40 to +105°C
Lead Temperature (soldering, 10 sec.) +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 T able is not implied.

Absolute Maximum Ratings

METAL CASE

INSULATED BASE

0.040 ±0.002 DIA.
(1.016 ±0.051)

2.00

(50.80)

1.800

(45.72)

0.600

(15.24)

0.400

(10.16)

0.400

(10.16)

0.10

(2.54)

0.10

(2.54)

0.10

(2.54)

0.48

(12.19)

0.20 MIN
(5.08)

BOTTOM VIEW

0.800

(20.32)

1.00

(25.40)

1
2

4

5

6

3

DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein
do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.

DATEL (UK) LTD. Tadley, England Tel: [phone]
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: [phone]
DATEL GmbH München, Germany Tel: [phone]
DATEL KK Tokyo, Japan Tel: [phone], Osaka Tel: [phone]

DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: [phone] [phone] Fax: [phone]
Internet: www.datel.com Email: [e-mail]
Data Sheet Fax Back:[phone]

DS-0427A 6/99

The On/Off Control pin has an internal 10kW pull-up resistor to +VIN. It can be
driven with any logic circuit capable of meeting the following drive requirements.
Logic "0" = 0 to +0.8V. Logic "1" = +2.0V to +V

IN. IIH (@VIN = +2.0V) = –1.2mA.

I

IL (@VIN = 0V) = –1.4mA. Open collector logic or a single NPN drive transistor

can be used. The drive circuit should be rated for more than 13.6V. Applying a
voltage to pin 3 when no input power is applied to the converter can cause
permanent damage to the converter.

On/Off Control Functionality

ORDERING INFORMATION

UNR-5/5-D12 Non-Isolated, 12V-to-5V, 25 Watt, DC/DC Converter

I/O Connections

Pin Function P21

1 +Input
2 Input Return
3 On/Off Control
4 +Output
5 Output Return
6 Trim

Note:

The case is connected to
pin 2 (Input Return).

INNOVATION and EX C ELL E N C

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Case C13

ISO-9001 REGISTERED