SQ48T15012-NECTG datasheet, PDF

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SQ48T15012-NECTG: DescriptionDC-DC Regulated Power Supply Module, 1 Output, 18W, Hybrid, ROHS COMPLIANT, 1/8 BRICK PACKAGE-8; CategoryPower/power management The power supply circuit; File Size4MB，66 Pages; ManufacturerBel; Websitehttp://www.belfuse.com; Environmental Compliance

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SQ48T15012-NECTG Overview

DC-DC Regulated Power Supply Module, 1 Output, 18W, Hybrid, ROHS COMPLIANT, 1/8 BRICK PACKAGE-8

SQ48T15012-NECTG Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	Bel
package instruction	,
Reach Compliance Code	compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	DC-DC REGULATED POWER SUPPLY MODULE
Maximum input voltage	75 V
Minimum input voltage	36 V
Nominal input voltage	48 V
JESD-30 code	R-XDMA-P8
JESD-609 code	e3
length	58.42 mm
Number of functions	1
Output times	1
Number of terminals	8
Maximum output voltage	1.32 V
Minimum output voltage	1.08 V
Nominal output voltage	1.2 V
Package body material	UNSPECIFIED
Package shape	RECTANGULAR
Package form	MICROELECTRONIC ASSEMBLY
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Certification status	Not Qualified
Maximum seat height	7.16 mm
surface mount	NO
technology	HYBRID
Terminal surface	MATTE TIN OVER NICKEL
Terminal form	PIN/PEG
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
Maximum total power output	18 W
Fine-tuning/adjustable output	YES
width	22.76 mm

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The SemiQ™ Series of dc-dc converters provides a high-

efficiency single output in a size that is only 60% of industry-

standard quarter-bricks, while preserving the same pinout and

functionality.

In high temperature environments, for output voltages ranging

from 3.3 V to 1.0 V, the thermal performance of SemiQ™

converters exceeds that of most competitors' 20-25 A quarter-

bricks. This performance is accomplished through the use of

patent-pending circuit, packaging, and processing techniques to

achieve ultra-high efficiency, excellent thermal management, and

a very low body profile.



RoHS lead-free solder and lead-solder-exempted products are

available

Delivers up to 15A (50W)

Industry-standard quarter-brick pinout

Outputs available in 12.0, 8.0, 6.0, 5.0, 3.3, 2.5, 2.0, 1.8, 1.5, 1.2,

and 1.0 V

Available in through-hole and SMT packages

Low profile: 0.258” (6.55 mm)

Low weight: 0.53 oz (15 g)

On-board input differential LC-filter

Startup into pre-biased output

No minimum load required

Meets Basic Insulation requirements

Withstands 100 V input transient for 100 ms

Fixed-frequency operation

Fully protected

Remote output sense

Positive or negative logic ON/OFF option

Output voltage trim range: +10%/−20% with industry-standard

trim equations (except 1.2 V and 1.0 V outputs with trim range

± 10%)

Output voltage trim range: +10%/−20% with industry-standard

trim equations (except 1.2 V and 1.0 V outputs with trim range

± 10%)

Safety according to IEC/EN 60950-1 2 Edition and UL/CSA

60950-1 2 Edition

Designed to meet Class B conducted emissions per FCC and

EN55022 when used with external filter

All materials meet UL94, V-0 flammability rating

Low body profile and the preclusion of heat sinks minimize

airflow shadowing, thus enhancing cooling for downstream

devices. The use of 100% automation for assembly, coupled with

advanced electronic circuits and thermal design, results in a

product with extremely high reliability.

Operating from a 36-75 V input, the SQ48 Series converters

provide any standard output voltage from 12 V down to 1.0 V.

Outputs can be trimmed from –20% to +10% of the nominal

output voltage (± 10% for output voltages 1.2 V and 1.0 V), thus

providing outstanding design flexibility.

With a standard pinout and trim equations, the SQ48 Series

converters are perfect drop-in replacements for existing quarter-

brick designs. Inclusion of this converter in new designs can

result in significant board space and cost savings. In both cases

the designer can expect reliability improvement over other

available converters because of the SQ48 Series’ optimized

thermal efficiency.



Telecommunications

Data Communications

Wireless Communications

Servers



High efficiency – no heat sink required

For output voltages ranging from 3.3 to 1.0 V, 40% higher

current capability at elevated temperatures than most

competitors' 20-25A quarter-bricks

Extremely small footprint: 0.896” x 2.30” (2.06 in ), 40%

smaller than conventional quarter-bricks

North America

+1-866.513.2839

Asia-Pacific

+86.755.29885888

Europe, Middle East

+353 61 225 977

tech.support@psbel.com

belpowersolutions.com



BCD.00637_AA

helps to ensure stability of the converter. In many applications, the user has to use decoupling capacitance at the load. The

power converter will exhibit stable operation with external load capacitance up to 1000

μF

on 12 V, 2,200

μF

on 8.0 V,

10,000

μF

on 5.0 – 6.0 V, and 15,000

μF

on 3.3 – 1.0 V outputs.

Additionally, see the EMC section of this data sheet for discussion of other external components which may be required for

control of conducted emissions.

The ON/OFF pin is used to turn the power converter on or off remotely via a system signal. There are two remote control

options available, positive logic and negative logic, with both referenced to Vin(-). A typical connection is shown in Fig. A.

Fig. A: Circuit configuration for ON/OFF function

The positive logic version turns on when the ON/OFF pin is at a logic high and turns off when at a logic low. The converter

is on when the ON/OFF pin is left open. See Electrical Specifications for logic high/low definitions.

The negative logic version turns on when the pin is at a logic low and turns off when the pin is at a logic high. The ON/OFF

pin can be hardwired directly to Vin(-) to enable automatic power up of the converter without the need of an external control

signal.

The ON/OFF pin is internally pulled up to 5V through a resistor. A properly debounced mechanical switch, open collector

transistor, or FET can be used to drive the input of the ON/OFF pin. The device must be capable of sinking up to 0.2 mA at

a low level voltage of

≤

0.8 V. An external voltage source (± 20 V maximum) may be connected directly to the ON/OFF input,

in which case it must be capable of sourcing or sinking up to 1 mA depending on the signal polarity. See the Startup

Information section for system timing waveforms associated with use of the ON/OFF pin.

The remote sense feature of the converter compensates for voltage drops occurring between the output pins of the

converter and the load. The SENSE(-) (Pin 5) and SENSE(+) (Pin 7) pins should be connected at the load or at the point

where regulation is required (see Fig. B).

Fig. B: Remote sense circuit configuration

CAUTION

If remote sensing is not utilized, the SENSE(-) pin must be connected to the Vout(-) pin (Pin 4), and the SENSE(+) pin must

be connected to the Vout(+) pin (Pin 8) to ensure the converter will regulate at the specified output voltage. If these

connections are not made, the converter will deliver an output voltage that is slightly higher than the specified data sheet

value.

Because the sense leads carry minimal current, large traces on the end-user board are not required. However, sense traces

should be run side by side and located close to a ground plane to minimize system noise and ensure optimum

performance.

When using the remote sense function, the converter’s output overvoltage protection (OVP) senses the voltage across

866.513.2839

tech.support@psbel.com

belpowersolutions.com

BCD.00637_AA

where,

DECR

Required value of trim-down resistor [kΩ] and

is defined above.

Note:

The above equations for calculation of trim resistor values match those typically used in conventional industry-standard quarter-bricks and one-

eighth bricks (except for 1.2 V and 1.0 V outputs).

Converters with output voltages 1.2 V and 1.0 V are available with alternative trim feature to provide the customers with the

flexibility of second sourcing. These converters have a “T” character in the part number. The trim equations of “T” version

of converters and more information can be found in Application Note 103.

Fig. D: Configuration for decreasing output voltage

Trimming/sensing beyond 110% of the rated output voltage is not an acceptable design practice, as this condition could

cause unwanted triggering of the output overvoltage protection (OVP) circuit. The designer should ensure that the

difference between the voltages across the converter’s output pins and its sense pins does not exceed 10% of V

OUT

(

NOM

or:

OUT

(



)



OUT

(



)]



SENSE

(



)



SENSE

(



)]



O - NOM X

10%

[V]

This equation is applicable for any condition of output sensing and/or output trim.

Input undervoltage lockout is standard with this converter. The converter will shut down when the input voltage drops

below a pre-determined voltage.

The input voltage must be typically 34 V for the converter to turn on. Once the converter has been turned on, it will shut off

when the input voltage drops typically below 32 V. This feature is beneficial in preventing deep discharging of batteries

used in telecom applications.

The converter is protected against overcurrent or short circuit conditions. Upon sensing an overcurrent condition, the

converter will switch to constant current operation and thereby begin to reduce output voltage. When the output voltage

drops below 50% of the nominal value of output voltage, the converter will shut down (Fig. x.17).

Once the converter has shut down, it will attempt to restart nominally every 100 ms with a typical 1-2% duty cycle (Fig.

x.18). The attempted restart will continue indefinitely until the overload or short circuit conditions are removed or the output

voltage rises above 50% of its nominal value.

Once the output current is brought back into its specified range, the converter automatically exits the hiccup mode and

continues normal operation.

866.513.2839

tech.support@psbel.com

belpowersolutions.com

BCD.00637_AA

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