H48SN28012NRFA - Delta Electronics Inc.

FEATURES

 High Efficiency: 91.0% @ 28V/12.5A

 Size: 61.0x57.9x12.7mm (2.40”×2.28”×0.50”)

 Standard footprint

 Industry standard pin out

 Fixed frequency operation

 Metal baseplate

 Input UVLO, Output OCP, OVP, OTP

 Basic insulation

 2250V isolation

 2:1 Input voltage range

 ISO 9001, TL 9000, ISO 14001, QS9000,

OHSAS18001 certified manufacturing facility

 UL/cUL 60950-1 (US & Canada) recognized,

and TUV (EN60950-1) certified

 CE mark meets 73/23/EEC and 93/68/EEC

directive

Delphi Series H48SN, 350W Half Brick Family

DC/DC Power Modules: 48V in, 28V/12.5A out

APPLICATIONS

 Telecom / Datacom

 Wireless Networks

ork Equipment

ata Storage

OPTIONS

 Positive Remote On/Off logic

 Short pin lengths available

The Delphi Series H48SN Half Brick, 48V input, single output,

isolated DC/DC converters are the latest offering from a world leade

in power systems technology and manufacturing -- Delta Electronics,

Inc. This product family provides up to 350 watts of power in an

industry standard footprint. It provides 91% efficiency for 28V at full

load. With creative design technology and optimization of component

placement, these converters possess outstanding electrical and

thermal performance, as well as extremely high reliability unde

highly stressful operating conditions.

ll models are fully protected

from abnormal input/output voltage, current, and temperature

conditions. The Delphi Series converters meet all safety

requirements with basic insulation. A variety of optional heatsinks are

available for extended thermal operation as well as for use in highe

air flow applications: 200 to 400 LFM.

 Optical Netw

 Server and D

 Industrial / Testing Equipment

DATASHEET

012_01172008

DS_H48SN28

TECHNICAL SPECIFICATIONS

(TA=25°C, airflow rate=600 LFM, Vin=48Vdc, nominal Vout unless otherwise noted.)

H48SN28012_01172008

PARAMETER NOTES and CONDITIONS H48SN28012 (Standard)

Min. Typ. Max. Units

ABSOLUTE MAXIMUM RATINGS

Input Voltage

Continuous 80 Vdc

Transient (100ms) 100ms 100 Vdc

Operating Temperature Please refer to Fig.21 for measuring point -40 110 °C

Storage Temperature -55 125 °C

Input/Output Isolation Voltage 2250 Vdc

INPUT CHARACTERISTICS

Operating Input Voltage 36 48 75 Vdc

Input Under-Voltage Lockout

Turn-On Voltage Threshold 33 35 Vdc

Turn-Off Voltage Threshold 31 33 Vdc

Lockout Hysteresis Voltage 1 3 Vdc

Maximum Input Current 100% Load, 36Vin 12.6 A

Minimum -Load Input Current 260 mA

Off Converter Input Current Per ETSI EN300 132-2 15 mA

Inrush Current(I2t) 0.2 1 A2s

Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 12 mA

Input Voltage Ripple Rejection 120 Hz 60 dB

OUTPUT CHARACTERISTICS

Output Voltage Set Point Vin=48V, Io=Io.max, Tc=25°C 27.72 28.00 28.28 Vdc

Output Voltage Regulation

Over Load Io=Io,min to Io,max ±20 ±112 mV

Over Line Vin=36V to 75V ±20 ±56 mV

Over Temperature Tc=-40°C to 100°C ±250 ±300 mV

Total Output Voltage Range over sample load, line and temperature 27.25 28.00 28.75 V

Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth

Peak-to-Peak Full Load, 1µF ceramic, 10µF Low ESR cap 60 150 mV

RMS Full Load, 1µF ceramic, 10µF Low ESR cap 14 40 mV

Operating Output Current Range 0.3 12.5 A

Output DC Current-Limit Inception Output Voltage 10% Low 120 %

DYNAMIC CHARACTERISTICS

Output Voltage Current Transient 48V, Tested with a aluminum ,10µF Low ESR cap

and 1

F Ceramic load ca

,ΔIo/Δt=1A/10

Positive Step Change in Output Current 50% Io.max to 75% Io.max 150 mV

Negative Step Change in Output Current 75% Io.max to 50% Io.max 150 mV

Settling Time (within 1% Vout nominal) 300 us

Turn-On Transient

Start-Up Time, From On/Off Control 20 35 ms

Start-Up Time, From Input 20 35 ms

Output Capacitive Load Full load; 5% overshoot of Vout at startup 330 5000 µF

EFFICIENCY

100% Load 91.0 %

60% Load 91.5 %

ISOLATION CHARACT ER ISTICS

Input to Output 2250 Vdc

Input to Case 2250 Vdc

Output to Case 500 Vdc

Isolation Resistance 10 MΩ

Isolation Capacitance 1900 pF

FEATURE CHARACTERISTICS

Switching Frequency 330 kHz

ntr

l N

ega

tiv

ff l

Logic Low (Module On) Von/off at Ion/off=1.0mA 0 0.8 V

Logic High (Module Off) Von/off at Ion/off=0.0 µA 15 V

ON/OFF Control, Positive Remote On/Off logic

Logic Low (Module Off) Von/off at Ion/off=1.0mA 0 0.8 V

Logic High (Module On) Von/off at Ion/off=0.0 µA 15 V

ON/OFF Current Ion/off at Von/off=0.0V 1 mA

Leakage Current Logic High, Von/off=15V 50 uA

Output Voltage Trim Range Across Pins 9 & 5, Pout ≦ max rated power -40 +10 %

Output Voltage Remote Sense Range Pout ≦ max rated power 0.5 V

Output Over-Voltage Protection Over full temp range; % of nominal Vout 115 140 %

GENERAL SPECIFICATIONS

MTBF Io=80% of Io, max; Ta=25°C 1.35 M hours

Weight 62 grams

Over-Temperature Shutdown Please refer to Fig.21 for measuring point 115 °C

ELECTRICAL CHARACTERISTICS CURVES

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

40.0

45.0

024681012

OUTPUT CURRENT(A)

POWER DISSIPATION (W)

02 46 81012

OUTPUT CURRENT (A)

EFFICIENCY (%)

36Vin 48Vin 75Vin

Figure 1: Efficiency vs. load current for minimum, nominal, and

maximum input voltage at 25°C.

Figure 2: Power dissipation vs. load current for minimum,

nominal, and maximum input voltage at 25°C.

0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

30 35 40 45 50 55 60 65 70 75

INPUT VOLTAGE (V)

INPUT CURREN (A)

Io=12.5A Io=7.5A Io=1.25A

Figure 3: Typical input characteristics at room temperature

H48SN28012_01172008

ELECTRICAL CHARACTERISTICS CURVES

For Negative Remote On/Off Logic

Figure 4: Turn-on transient at full rated load current (resistive

load) (10ms/div). CH3: Vout;5V/div; CH1: ON/OFF input: 2V/div

Figure 5: Turn-on transient at minimum load current

(10ms/div). CH3: Vout: 5V/div; CH1: ON/OFF input: 2V/div

For Positive Remote On/Off Logic

Figure 6: Turn-on transient at full rated load current (resistive

load) (10ms/div). Top Trace: Vout; 5V/div; Bottom Trace:

ON/OFF input: 2V/div

Figure 7: Turn-on transient at zero load current (10ms/div). Top

Trace: Vout: 5V/div; Bottom Trace: ON/OFF input: 2V/div

H48SN28012_01172008

ELECTRICAL CHARACTERISTICS CURVES

Figure 8: Output voltage response to step-change in load

current (75%-50% of Io, max; di/dt = 1A/10µS

)

. Load cap:

330µF aluminum,10uF Low ESR capacitor and 1µF ceramic

capacitor. Top Trace: Vout (100mV/div), Bottom Trace: Iout

/div). Scope measurement should be made using a BNC

cable (length shorter than 20 inches). Position the load

between 51 mm to 76 mm (2 inches to 3 inches) from the

module.

Figure 9: Output voltage response to step-change in load

current (50%-75% of Io, max; di/dt = 1A/10µS

)

. Load cap:

330µF aluminum,10uF Low ESR capacitor and 1µF ceramic

capacitor. Top Trace: Vout (100mV/div), Bottom Trace: Iout

/div). Scope measurement should be made using a BNC

cable (length shorter than 20 inches

)

. Position the load

between 51 mm to 76 mm (2 inches to 3 inches

)

from the

module.

Figure 10: Test set-up diagram showing measurement points

for Input Terminal Ripple Current and Input Reflected Ripple

Current.

Note: Measured input reflected-ripple current with a simulated

source Inductance (LTEST

)

of 12 μH. Capacitor Cs offset

possible battery impedance. Measure current as shown above.

H48SN28012_01172008

ELECTRICAL CHARACTERISTICS CURVES

Figure 11: Input Terminal Ripple Current, ic, at full rated output

current and nominal input voltage with 12µH source impedance

and 220µF electrolytic capacitor (1A/div).

Figure 12: Input reflected ripple current, is, through a 12µH

source inductor at nominal input voltage and rated load current

(10 mA/div)

Vo(-)

Vo(+)

10u 1u

Copper Strip

SCOPE RESISTIV

LOAD

Figure 13: Output voltage noise and ripple measurement test

setup

H48SN28012_01172008

ELECTRICAL CHARACTERISTICS CURVES

0.0

5.0

10.0

15.0

20.0

25.0

30.0

02468101214161820

LOAD CURRENT (A)

OUTPUT VOLTAGE (V)

Vin=48V

Figure 14: Out

ut voltage ripple at nominal input voltage and

rated load current (20 mV/div). Load capacitance:330uF

aluminum, 1µF ceramic capacitor and 10µFlow ESR capacitor.

Bandwidth: 20 MHz. Scope measurement should be made

using a BNC cable (length shorter than 20 inches). Position the

load between 51 mm to 76 mm (2 inches to 3 inches) from the

module.

Figure 15: Output voltage vs. load current showing typical

current limit curves and converter shutdown points.

H48SN28012_01172008

DESIGN CONSIDERATIONS

Input Source Impedance

The impedance of the input source connecting to the

DC/DC power modules will interact with the modules

and affect the stability. A low ac-impedance input source

is recommended. If the source inductance is more than

a few μH, we advise adding a 220 to 470 μF electrolytic

capacitor (ESR < 0.1 Ω at 100 kHz) mounted close to

the input of the module to improve the stability.

Layout and EMC Considerations

Delta’s DC/DC power modules are designed to operate

in a wide variety of systems and applications. For design

assistance with EMC compliance and related PWB

layout issues, please contact Delta’s technical support

team. An external input filter module is available for

easier EMC compliance design. Application notes to

assist designers in addressing these issues are pending

release.

Safety Considerations

The power module must be installed in compliance with

the spacing and separation requirements of the

end-user’s safety agency standard, i.e., UL60950,

CAN/CSA-C22.2 No. 60950-00 and EN60950:2000 and

IEC60950-1999, if the system in which the power

module is to be used must meet safety agency

requirements.

Basic insulation based on 75 Vdc input is provided

between the input and output of the module for the

purpose of applying insulation requirements when the

input to this DC-to-DC converter is identified as TNV-2

or SELV. An additional evaluation is needed if the

source is other than TNV-2 or SELV.

When the input source is SELV, the power module meets

SELV (safety extra-low voltage) requirements. If the

input source is a hazardous voltage which is greater than

60 Vdc and less than or equal to 75 Vdc, for the module’s

output to meet SELV requirements, all of the following

must be met:

 The input source must be insulated from the ac

mains by reinforced or double insulation.

 The input terminals of the module are not operator

accessible.

 If the metal baseplate is grounded, one Vi pin and

one Vo pin shall also be grounded.

 A SELV reliability test is conducted on the system

where the module is used, in combination with the

module, to ensure that under a single fault,

hazardous voltage does not appear at the module’s

output.

When installed into a Class II equipment (without

grounding), spacing consideration should be given to

the end-use installation, as the spacing between the

module and mounting surface have not been evaluated.

The power module has extra-low voltage (ELV) outputs

when all inputs are ELV.

This power module is not internally fused. To achieve

optimum safety and system protection, an input line fuse

is highly recommended. The safety agencies require a

normal-blow fuse with 20A maximum rating to be

installed in the ungrounded lead. A lower rated fuse can

be used based on the maximum inrush transient energy

and maximum input current.

Soldering and Cleaning Considerations

Post solder cleaning is usually the final board assembly

process before the board or system undergoes electrical

testing. Inadequate cleaning and/or drying may lower the

reliability of a power module and severely affect the

finished circuit board assembly test. Adequate cleaning

and/or drying is especially important for un-encapsulated

and/or open frame type power modules. For assistance

on appropriate soldering and cleaning procedures,

please contact Delta’s technical support team.

H48SN28012_01172008

FEATURES DESCRIPTIONS

Over-Current Protection

The modules include an internal output over-current

protection circuit, which will endure current limiting for

an unlimited duration during output overload. If the

output current exceeds the OCP set point, the modules

will automatically shut down (hiccup mode).

The modules will try to restart after shutdown. If the

overload condition still exists, the module will shut down

again. This restart trial will continue until the overload

condition is corrected.

Over-Voltage Protection

The modules include an internal output over-voltage

protection circuit, which monitors the voltage on the

output terminals. If this voltage exceeds the over-voltage

set point, the module will shut down and latch off. The

over-voltage latch is reset by either cycling the input

power or by toggling the on/off signal for one second.

Over-Temperature Protection

The over-temperature protection consists of circuitry

that provides protection from thermal damage. If the

temperature exceeds the over-temperature threshold

the module will shut down.

The module will try to restart after shutdown. If the

over-temperature condition still exists during restart, the

module will shut down again. This restart trial will

continue until the temperature is within specification.

Remote On/Off

The remote on/off feature on the module can be either

negative or positive logic. Negative logic turns the

module on during a logic low and off during a logic high.

Positive logic turns the modules on during a logic high

and off during a logic low.

Remote on/off can be controlled by an external switch

between the on/off terminal and the Vi(-) terminal. The

switch can be an open collector or open drain.

For negative logic if the remote on/off feature is not

used, please short the on/off pin to Vi(-). For positive

logic if the remote on/off feature is not used, please

leave the on/off pin to floating.

Vo(+)Vi(+)

Vo(-)

Sense(-)

Sense(+)

Vi(-)

ON/OFF

Figure 16: Remote on/off implementation

Remote Sense

Remote sense compensates for voltage drops on the

output by sensing the actual output voltage at the point

of load. The voltage between the remote sense pins

and the output terminals must not exceed the output

voltage sense range given here:

[Vo(+) – Vo(–)] – [SENSE(+) – SENSE(–)] ≤ 10% × Vout

This limit includes any increase in voltage due to

remote sense compensation and output voltage set

point adjustment (trim).

Vi(-)

Vi(+)

Vo(-)

Vo(+)

Sense(+)

Sense(-)

Resistance

Contact Contact and Distributio

Losses

Figure 17: Effective circuit configuration for remote sense

operation

If the remote sense feature is not used to regulate the

output at the point of load, please connect SENSE(+) to

Vo(+) and SENSE(–) to Vo(–) at the module.

The output voltage can be increased by both the

remote sense and the trim; however, the maximum

increase is the larger of either the remote sense or the

trim, not the sum of both.

When using remote sense and trim, the output voltage

of the module is usually increased, which increases the

power output of the module with the same output

current.

Care should be taken to ensure that the maximum

output power does not exceed the maximum rated

power.

FEATURES DESCRIPTIONS (CON.)

Output Voltage Adjustment (TRIM)

To increase or decrease the output voltage set point,

the modules may be connected with an external

resistor between the TRIM pin and either the

SENSE(+) or SENSE(-). The TRIM pin should be left

open if this feature is not used.

Figure 18: Circuit configuration for trim-down (decrease

output voltage)

If the external resistor is connected between the TRIM

and SENSE (-) pins, the output voltage set point

decreases (Fig. 18). The external resistor value

required to obtain a percentage of output voltage

change △% is defined as:

Rtrim down= 100

Δ%2−

⎛

⎜

⎝

⎞

⎟

⎠

ΚΩ

Ex. When Trim-down -60%(28.0V×0.6=16.8V)

Vo 28.0:= VΔ40:=

100

Δ2−0.5=KΩ

Figure 19: Circuit configuration for trim-up (increase output

voltage)

If the external resistor is connected between the TRIM

and SENSE (+) the output voltage set point increases

(Fig. 19). The external resistor value required to obtain

a percentage output voltage change △% is defined

as:

Rtrim up= Vo 100 Δ%+

(

)

⋅

1.225Δ%⋅

100 2Δ%+

Δ%

−

⎡

⎢

⎣

⎤

⎥

⎦ΚΩ

Ex. When Trim-up +10%(28.0V×1.1=30.8V)

Vo 28.0:= VΔ10:=

Vo 100 Δ+

()

⋅

1.225 Δ⋅

100 2 Δ⋅+

−239.429=KΩ

The output voltage can be increased by both the remote

sense and the trim, however the maximum increase is

the larger of either the remote sense or the trim, not the

sum of both.

When using remote sense and trim, the output voltage

of the module is usually increased, which increases the

power output of the module with the same output

current.

Care should be taken to ensure that the maximum

output power of the module remains at or below the

maximum rated power.

H48SN28012_01172008

THERMAL CONSIDERATIONS

Thermal Derating

Thermal management is an important part of the system

design. To ensure proper, reliable operation, sufficient

cooling of the power module is needed over the entire

temperature range of the module. Convection cooling is

usually the dominant mode of heat transfer.

Heat can be removed by increasing airflow over the module.

The module’s maximum case temperature is 110 ℃. To

enhance system reliability, the power module should always

be operated below the maximum operating temperature. If

the temperature exceeds the maximum module

temperature, reliability of the unit may be affected.

Hence, the choice of equipment to characterize the

thermal performance of the power module is a wind

tunnel.

Thermal Testing Setup

THERMAL CURVES

Delta’s DC/DC power modules are characterized in

heated vertical wind tunnels that simulate the thermal

environments encountered in most electronics

equipment. This type of equipment commonly uses

vertically mounted circuit cards in cabinet racks in which

the power modules are mounted.

The following figure shows the wind tunnel

characterization setup. The power module is mounted

on a test PWB and is vertically positioned within the

wind tunnel. The space between the neighboring PWB

and the top of the power module is constantly kept at

6.35mm (0.25’’).

Figure 21: Temperature measurement location

The allowed maximum hot spot temperature is defined at 110

℃

Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)

12.7 (0.5”)

MODULE

IR F LO

50.8

(

2.0”

)

FACING PW

PWB

AIR VELOCIT

AND AMBIEN

TEMPERATUR

MEASURED BELO

THE MODUL

100

150

200

250

300

350

400

25 35 45 55 65 75 85 95 105

Output Power (W)

Hot Spot Temperature(℃)

H48SN28012NR A (Standard) Output Power vs. Hot Spot Temperature

(Either Orientation)

Figure 22: Output power vs. hot spot temperature (Either

Orientation)

Figure 20: Wind Tunnel Test Setup

H48SN28012_01172008

MECHANICAL DRAWING

Pin No.

Name Function

-Vin

CASE

ON/OFF

Ne age

Pin S ecificatio

gative input volt

se ground

Remote ON/OFF

Positive input voltag

Positive output voltage

Positive remote sense

Output voltage trim

Negative remote sense

Negative output voltage

+Vin

+Vout

+SEN

TRIM

-SENSE

-Vout

p n:

Pins 1-4, 6-8

Pins 5 & 9

1.00mm (0.040”) diameter

2.00mm (0.079”) diameter

with Tin pla

All pins are copper ting.

H48SN28012_01172008

PART NUMBERING SYSTEM

H 48 S N 280 12 N R F A

Form

Factor Input

Voltage Number of

Outputs Product

Series Output

Voltage Output

Current ON/OFF

Logic Pin

Length Option Code

H- Half

Brick

48V S- Single N- 350W

series

280- 28V 12- 12.5A

N- Negative

P- Positive

R- 0.170”

N- 0.145”

K- 0.110”

F- RoHS 6/6

(Lead Free)

Space - RoHS

5/6

A - Standard

Functions

B - no thread

heatsink mounting

hole

MODEL LIST

MODEL NAME INPUT OUTPUT EFF @ 100% LOAD

H48SN28012NRFA 36V~75V 12.5A 28V 12.5A 91%

Default remote on/off logic is negative and pin length is 0.170”

For different remote on/off logic and pin length, please refer to part numbering system above or contact your local sales

CONTACT: www.delta.com.tw/dcdc

USA:

Telephone:

East Coast: (888) 335 8201

West Coast: (888) 335 8208

Fax: (978) 656 3964

Email: DCDC@delta-corp.com

Europe:

Phone: +41 31 998 53 11

Fax: +41 31 998 53 53

Email: DCDC@delta-es.com

Asia & the rest of world:

Telephone: +886 3 4526107 ext 6220

Fax: +886 3 4513485

Email: DCDC@delta.com.tw

WARRANTY

Delta offers a two (2) year limited warranty. Complete warranty information is listed on our web site or is available upon

request from Delta.

Information furnished by Delta is believed to be accurate and reliable. However, no responsibility is assumed by Delta for its

use, nor for any infringements of patents or other rights of third parties, which may result from its use. No license is granted

by implication or otherwise under any patent or patent rights of Delta. Delta reserves the right to revise these specifications

at any time, without notice.